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is expected to reach 5439 million worldwide&#46;<a class="elsevierStyleCrossRef" href="#bib0480"><span class="elsevierStyleSup">3</span></a> Although there exists considerable variability in the choice of appropriate RRT modality all over the world&#44; most patients are treated with in-centre hemodialysis &#40;HD&#41;&#44; which in most countries exceeds 90&#37; of the incident and 60&#37; of the prevalent ESRD population&#46;<a class="elsevierStyleCrossRef" href="#bib0485"><span class="elsevierStyleSup">4</span></a> Despite numerous advances in the field of RRT&#44; outcomes related to the quality of life and morbi-mortality in ESRD patients have not reached the expected levels&#46; A growing body of evidence seems to indicate that more prolonged and more frequent dialysis therapies are associated with improved outcomes&#44;<a class="elsevierStyleCrossRefs" href="#bib0260"><span class="elsevierStyleSup">5&#8211;7</span></a> which is in full agreement with both hemodynamic and renal physiology&#46; However&#44; most HD therapies are still exclusively performed intermittently using large immovable machines&#44; installed in hemodialysis centers&#46; It is also known that such treatments severely restrict the activities of daily living &#40;ADL&#41; of most ESRD patients&#46; Due to this phenomenon&#44; there has been an increasing interest in the development of a fully portable HD device since the early 1980s&#46; With the advent of nanotechnology and miniaturization the first truly portable device meant for RRT&#44; i&#46;e&#46; the Wearable Artificial Kidney &#40;WAK&#41;&#44; was first realised in 2005&#46;<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">8</span></a></p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">ESRD and the clinical rationale for WAK</span><p id="par0010" class="elsevierStylePara elsevierViewall">Cardiovascular disease &#40;CVD&#41; is the most common cause of death in dialysis patients&#46; In addition to traditional risk factors&#44; CVD morbi-mortality is also associated with uremia-related factors &#40;URF&#41; such as fluid overload&#44; hyperphosphatemia&#44; anemia&#44; left ventricular hypertrophy&#44; chronic inflammation and endothelial dysfunction&#46;<a class="elsevierStyleCrossRefs" href="#bib0490"><span class="elsevierStyleSup">9&#8211;12</span></a> Due to the inherent inability of the traditional thrice weekly HD regimen to completely replace renal function and to optimize all URF&#44; ESRD patients are required to follow stringent dietary restrictions &#40;especially in potassium&#44; phosphorus and total fluid intake&#41; and to regularly consume a large number of oral medications&#46; Recent studies have suggested that some of the benefits of high frequency and long duration dialysis are similar to those associated with kidney transplantation&#44; due to the achievement of greater solute clearance&#44; better volume control&#44; better nutritional status and a higher health-related quality of life &#40;HR-QOL&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0495"><span class="elsevierStyleSup">13&#8211;15</span></a> It is also accompanied by a reduction of ESRD related complications such as anemia&#44; hypertension&#44; hospitalization and need for additional medication &#40;e&#46;g&#46; such as phosphate binders and antihypertensive therapy&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">16</span></a> Improvement of the blood pressure control associated with a reduced risk of intradialytic hypotension and a more physiological ultrafiltration &#40;UF&#41; rate during prolonged HD&#44; may prevent cardiac stunning and thus reduce the risk of CVD related morbi-mortality in ESRD patients&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Residual Renal Function &#40;RRF&#41; plays a key role in ESRD patients especially for fluid&#44; salt and phosphorus excretion&#44; for clearance of middle size molecules and also for endogenous vitamin D and erythropoietin production&#46;<a class="elsevierStyleCrossRefs" href="#bib0320"><span class="elsevierStyleSup">17&#44;18</span></a> It is associated with better patient survival and greater health-related quality of life &#40;HR-QOL&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0510"><span class="elsevierStyleSup">19</span></a> Generally&#44; conventional HD treatments are performed with a fixed dose of thrice-weekly&#44; without considering RRF&#46; Preservation of RRF requires a holistic approach through regular monitoring&#44; blood pressure control optimization&#44; elimination of nephrotoxins and an individualized dialysis prescription&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Most dialysis patients have low HR-QOL which is an independent predictor of mortality in this population&#46;<a class="elsevierStyleCrossRefs" href="#bib0335"><span class="elsevierStyleSup">20&#8211;22</span></a> Dismal HR-QOL scores are partly explained by the co-existing comorbidities&#44; but also by depression and the relatively high symptom burden&#46;<a class="elsevierStyleCrossRefs" href="#bib0350"><span class="elsevierStyleSup">23&#44;24</span></a> Conventional HD regimen not only markedly limits patient freedom&#44; but also can be associated with severe post-dialysis fatigue that can further negatively impact HR-QOL&#46;<a class="elsevierStyleCrossRefs" href="#bib0355"><span class="elsevierStyleSup">24&#44;25</span></a> HR-QOL is a critical issue&#44; being used to assess the effectiveness of healthcare interventions and it is becoming as important as morbidity and mortality while evaluating outcomes in dialysis patients&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">26</span></a> Manns et al&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">27</span></a> reported 30 important concerns for ESRD patients and found that although they do care about effects of dialysis modality on overall survival&#44; they also worry about fatigue&#44; depression&#44; better quality of life&#44; a good dialysis access&#44; the ability to travel and to exercise and to eliminate barriers that hamper their ADL&#46; Many ESRD patients have expressed interest in portable dialysis options&#46;<a class="elsevierStyleCrossRefs" href="#bib0370"><span class="elsevierStyleSup">27&#44;28</span></a> Since 2009&#44; the US Institute of Medicine and the Patient Centred Outcomes Research Institute have promoted patient-centred care and it is also incentivized by the US Centres for Medicare and Medicaid services in designing quality programs for the ESRD population&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">29</span></a> Based on this concept&#44; Nissenson et al&#46; proposed a Maslow-like &#8220;quality pyramid&#8221; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#44; in which HR-QOL occupies the apex&#44; supported by mortality&#44; hospitalization and patient experience&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">30</span></a> According to this&#44; dialysis patients&#8217; treatment&#44; which until recently was focused only on the assurance of fundamental clinical aspects &#40;such as volume control&#44; anemia and calcium-phosphorus metabolism&#41; and outcomes&#44; must also aspire for goals such as improved HR-QOL&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">WAK and WUF evolution</span><p id="par0025" class="elsevierStylePara elsevierViewall">The initial idea of the WAK traces back to the 1970s&#46; However&#44; it was limited by the technologies available at that time&#46;<a class="elsevierStyleCrossRefs" href="#bib0390"><span class="elsevierStyleSup">31&#8211;33</span></a> Mobility was one of the major limitations found&#44; since the earlier device weighed almost 6&#46;35<span class="elsevierStyleHsp" style=""></span>kg &#40;14 pounds&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">31</span></a> Only recently&#44; the developments in technology and miniaturization have made wearable dialysis portable devices relatively practicable&#46; The first trial to assess safety and efficacy of the WAK was reported in 2005 in animal models&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a> Two years later&#44; this device was tested in a pilot study involving 8 HD patients with a mean age of 51&#46;7 years&#46;<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">35</span></a> They were connected to a device weighing 5<span class="elsevierStyleHsp" style=""></span>kg &#40;Xcorporeal Inc&#44; Los Angeles&#44; CA&#44; USA&#41;&#44; using a standard HD vascular access&#46; The total system was composed of a bi-compartmental circuit&#44; one for the blood and the other for the dialyzer&#59; a polysulfone 0&#46;6<span class="elsevierStyleHsp" style=""></span>m<span class="elsevierStyleSup">2</span> high flux dialyser &#40;Gambro Dialysatoren&#44; Hechingen&#44; Germany&#41;&#59; a pulsatile blood pump&#44; powered by a standard 9-V battery&#59; four micro-pumps &#40;Sorenson&#44; West Jordan&#44; UT&#44; USA&#41; used to infuse heparin into the blood circuit&#44; to infuse sodium bicarbonate&#44; magnesium&#44; and calcium acetate into the dialysate circuit&#44; and to control ultrafiltration&#46; A series of sorbent canisters containing urease&#44; activated charcoal&#44; hydroxyl zirconium oxide and zirconium phosphate were used to regenerate dialysate&#46; For safety two sensors for detection of air bubbles and of blood flow stoppage were used&#46; The mean treatment time was 6&#46;4 &#40;SD<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;0&#41; h&#46; There was no evidence of important cardiovascular changes&#44; hemolysis&#44; serum electrolytes disturbances or acid-base balance disturbances&#46; There was a statistically lower mean body weight after treatment&#46; Clearance rates for urea and creatinine were much lower than those typically achieved in conventional HD&#46; The mean blood flow was 58&#46;6<span class="elsevierStyleHsp" style=""></span>mL&#47;min&#44; with a dialysate flow of 47&#46;1<span class="elsevierStyleHsp" style=""></span>mL&#47;min&#46; The clotting of the vascular access that was observed in two patients was related to low heparin dose&#46; In one patient a fistula needle got dislodged&#44; but the blood pump stopped immediately&#44; without any sequelae&#46; The other technical problem occurred due to the accumulation of carbon dioxide bubbles in dialysate circuit&#44; but this did not imply the discontinuation of the treatment&#46; Despite the above technical difficulties&#44; the patient&#39;s feedback was encouraging&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">A growing body of evidence&#44; involving New York Heart Association &#40;NYHA&#41; class III and IV congestive heart failure &#40;CHF&#41; patients resistant to diuretics&#44; suggests that the removal of excess fluid&#44; cytokines and a myocardial depressant factor through ultrafiltration therapy is associated with better outcomes&#46;<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">36</span></a> However&#44; when UF is performed during a regular 4&#8211;6<span class="elsevierStyleHsp" style=""></span>h HD session&#44; it can result in hypotension and hemodynamic instability&#46; Gura et al&#46; in 2008&#44; described the first wearable hemofiltration device &#40;WUF&#41; to manage fluid overload&#46;<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a> This pilot study enrolled 6 fluid-overloaded HD patients in which isolated UF was applied for 6<span class="elsevierStyleHsp" style=""></span>h&#46; The average blood flow was 116<span class="elsevierStyleHsp" style=""></span>ml&#47;min and UF rate ranged between 120 and 288<span class="elsevierStyleHsp" style=""></span>ml&#47;h&#46; Cardiovascular and biochemical parameters remained stable and there were no major complications&#46; Clinically&#44; the WUF can potentially reduce the incidence of acute pulmonary edema&#44; ascites and other hypervolemic manifestations in patients with CHF NYHA Class III and IV&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">In 2016&#44; Gura et al published the first-ever human clinical trial which involved a 24<span class="elsevierStyleHsp" style=""></span>h WAK treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a> Seven HD patients were selected to perform a WAK treatment for 24<span class="elsevierStyleHsp" style=""></span>hours&#46; Their mean age was 49 years and 3 had CHF&#46; The mean blood flow was 42<span class="elsevierStyleHsp" style=""></span>ml&#47;min and dialysate flow was 43<span class="elsevierStyleHsp" style=""></span>ml&#47;min&#46; Mean weighted-average concentrations of blood urea nitrogen &#40;BUN&#41; and &#946;2-microglobulin were significantly lower during the 24-hour WAK treatment than those achieved in the previous 48-hour period by the conventional HD treatment&#46; The mean UF volume of the 5 subjects that completed the 24-hour treatment was 1002<span class="elsevierStyleHsp" style=""></span>ml and there were no significant hemodynamic changes&#46; The treatment was stopped in 2 patients due to technical complications&#58; namely clotting of the blood circuit in 1 subject and the appearance of a pink discoloration in the dialysate&#44; without analytic evidence of hemolysis&#44; in another&#46; After the seventh patient&#44; the clinical trial was discontinued due to technical issues&#44; such as development of excessive carbon dioxide bubbles in the dialysate circuit&#44; tubing kinks which caused fluctuation in blood and dialysate flow rates related to inconstant pump function&#46; There were no important cardiovascular changes&#44; acid&#8211;base disturbances&#44; or electrolytic serum disturbances&#46; The target UF was achieved and there was no need of dietary restriction or phosphorus-binding medications&#46; Patients reported a significantly greater satisfaction with the WAK&#44; owing to the greater freedom&#44; its convenience and its flexibility&#46;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Technical aspects of WAK and WUF</span><p id="par0040" class="elsevierStylePara elsevierViewall">The Wearable Artificial Kidney &#40;WAK&#41; is a wearable &#40;using a belt&#41; HD device that incorporates the basic components of a dialysis system into a wearable device&#44; permitting miniaturization&#44; patient-oriented management&#44; and improved mobility&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a> It works by drawing blood from the patient&#39;s vascular access and&#44; using heparin and a pump system&#44; and circulates it through the blood channel into the dialyzer&#46; The dialyzed blood is then returned to the patient&#46; The dialysate and the blood circulates in a counter-current direction&#46; Another pump empties the spent dialysate into a collection bag&#46; After going through a series of sorbents and being infused with a solution containing sodium bicarbonate&#44; the dialysate is returned to the dialyser&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">The mainly technical components are as follows&#58; pumping systems&#59; dialysis membranes&#59; dialysis regenerations&#59; patient monitoring systems and power sources &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0050" class="elsevierStylePara elsevierViewall">The WAK&#47;WUF pumping system possibly is the most critical technical component since it is responsible for ensuring adequate blood flow&#44; precise fluid exchange and drug infusion&#46; The pumping system can be further subdivided into blood pumps and other fluid pumps&#46; Blood pumps are responsible for extracting blood from the patient&#39;s vascular access&#44; and for providing the minimum reliable and adjustable blood flow through the filter and for returning the filtered blood to the patient&#46; Importantly&#44; all this dynamic flow has to be done without hemolysis and with the highest possible biocompatibility&#46; There are different types of blood pumps&#44; such as peristaltic&#44; shuttle&#44; rotary and finger pumps with different specifications&#46;<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a> Fluid pumps&#44; on the other hand allow for the delivery of drugs&#44; medications&#44; anticoagulants&#44; antibiotics etc&#46; or remove fluids and solutes from the extracorporeal circuit&#46; Additionally&#44; there are at least two more types of fluids pumps&#58; kinetic centrifugal and turbine pumps&#46;<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a> At the moment there is no WAK pump that has incorporates all the best characteristics into a single integrated system&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">WAK is a portable device used for long-term hemodialysis&#44; so it is easily understood that in addition to the usual requirements of a dialysis membrane&#44; the membranes used in this device should have some additional features related to portability and dialysis time&#46; In fact&#44; WAK dialysis membranes should have a geometry which allows for a replaceable disposable pump&#44; an effective surface area and pore distribution for longer treatment time and cannot have any associated haemolysis&#46;<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a> In the last years several advances in the development of dialysis membranes were made&#44; namely the lightweight hemofilter unit<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">33</span></a> and the application of mechanical vibration to induce high shear stress at the membrane surface with the aim of preserving membrane morphology and function for extended time periods&#46;<a class="elsevierStyleCrossRef" href="#bib0435"><span class="elsevierStyleSup">40</span></a> Other flourishing areas for dialysis membranes are the development of improved biocompatible materials and nanotechnology&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">Another important feature of the WAK is a dialysate regeneration system that has to be lightweight&#44; has to replace smart sorbent material with high adsorption capacity of uremic toxins and also has to accurately monitor the dialysate composition &#40;with pH&#44; temperature&#44; volume&#44; composition and bacterial contamination sensors&#41;&#46; These requirements have been largely achieved with the use of sorbent technology&#46;<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a> Kim et al demonstrated that in vitro&#44; a cold dialysate regeneration system using a small volume of dialysate can have results comparable to conventional HD&#46;<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">41</span></a> A promising system for the application of the WAK is the REDY cartridge&#44; which allows for the regeneration of 6L of dialysate per dialysis session&#46; This cartridge is composed of charcoal&#44; urease&#44; cation and an anion exchanger&#46; The evolution of this technology could overcome some of the previous problems related to the toxicity of aluminium and acidosis&#46; However&#44; this is yet to be miniaturized&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">Another key component of the WAK&#47;WUF is the patient monitoring system&#46; This is comprised of several sensors&#58; fluid balance&#44; pressure maintenance in the dialysis system&#44; pump power battery&#44; blood leakage and bubble detection&#44; as well as vascular access disconnection&#46;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">42</span></a> In the future&#44; it is intended that the control of these systems should be done remotely in order to continuously monitor and adjust the clinical parameters of the treatment&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">The power consumption of a WAK with a maximum pump flow rate of 120<span class="elsevierStyleHsp" style=""></span>ml&#47;min requires less than 5<span class="elsevierStyleHsp" style=""></span>W&#44;<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a> limiting the use of lithium batteries&#46; A promising innovations for WAK&#47;WUF could be thin-film&#44; solid-state batteries<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">42</span></a> and flexible batteries&#46;<a class="elsevierStyleCrossRef" href="#bib0450"><span class="elsevierStyleSup">43</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">The vascular access is the lifeline of most HD patients&#46; The WAK&#47;WUF vascular access must allow comfortable&#44; prolonged and frequent dialysis treatments&#44; without interference in ADL&#46; AVF is the preferred vascular access for HD&#46; However&#44; a small needle dislodgment can result in severe complications&#44; such as active bleeding&#44; putting the patient&#39;s life at risk&#46; Similar complications may also occur in grafts&#46; Prolonged HD with these two portable devices will need a modified vascular access system with safe and convenient connection&#47;disconnection systems&#44; and with reduced risk of biofilms formation and coagulation&#46; Taking previous experiences into consideration&#44; it seems reasonable that the future WAK&#47;WUF vascular access should be similar to a reduced lumen CVC with optimized aspects such as a port and more biocompatible materials which will have reduced associated risk of infection and coagulation&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">WAK and WUF economical aspects</span><p id="par0080" class="elsevierStylePara elsevierViewall">Although ESRD typically affects elderly people&#44; many young people with active professional life are also affected by it&#46; As a result&#44; ESRD in young people leads to interruptions in schedules&#44; reduced capacity to work due to forced absenteeism and sometimes even forces early retirement&#46; Kaitelidou et al&#46;<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">44</span></a> in an economic evaluation of HD in Greece demonstrated an overall loss of 2046 years due to mortality and a potential productivity loss amounting to 9&#46;9 million Euro&#44; according to human capital approach &#40;HCA&#41;&#46; Importantly&#44; in this study the total morbidity cost due to absence from work and early retirement was estimated at an amount exceeding 273 million Euro according to HCA&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">In selected patients WUF treatment can possibly reduce morbi-mortality&#44; by reducing the number of hospital admissions&#44; the length of hospital stay&#44; the ICU utilization and overall drug consumption&#46;<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">44</span></a> It is likely that this treatment could be beneficial to ESRD patients in terms of a reduced number of hospitalizations per year due to acute decompensated heart failure &#40;ADHF&#41;&#46; About a decade ago the UNLOAD trial&#44; which was conducted to investigate if UF therapy was superior to IV diuretics in the treatment of ADHF or not&#44; clearly proved that UF therapy significantly reduced the CHF hospitalization rates&#46; At 90 days&#44; the UF group versus the IV diuretics group had fewer patients rehospitalised for heart failure &#40;HF&#41; &#40;16 of 89 &#91;18&#37;&#93; vs&#46; 28 of 87 &#91;32&#37;&#93;&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;037&#41;&#44; fewer HF rehospitalisations &#40;0&#46;22<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;54 vs&#46; 0&#46;46<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;76&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;022&#41;&#44; and fewer rehospitalisation days &#40;1&#46;4<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#46;2 vs&#46; 3&#46;8<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#46;5&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;022&#41; per patient&#46;<a class="elsevierStyleCrossRef" href="#bib0460"><span class="elsevierStyleSup">45</span></a> We are also aware that hospitalizations for ADHF carry a significant economic burden for any healthcare system&#46; For example it was estimated that in an Italian hospital&#44; the average yearly cost per person for hospitalization for heart failure &#40;HHF&#41; was &#8364;11&#44;100&#44; of which &#8364;4300 euro was for the index hospitalization &#40;39&#37;&#41;&#44; &#8364;5900 for the subsequent hospitalizations &#40;53&#37;&#41;&#44; and the remaining &#8364;900 for non-hospital charges &#40;8&#37;&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">46</span></a> From the two above studies&#44; it is not unreasonable to assume that the use of the WUF device could have similar results&#44; i&#46;e&#46; a 50&#37; reduction in rehospitalisations and a 50&#37; reduction in rehospitalisation days if not more&#46; Considering the costs in an Italian hospital&#44; this reduction could hence lead to calculated savings of approximately &#8364;5100 per patient if we assume a 75&#37; reduction in non-index-hospitalization costs owing to a 50&#37; reduction in the number of HHF and 50&#37; reduction in the length of HHF&#46; Even if we consider a conservative figure of 5&#8211;10 HHF every year&#44; which is typical in a large Italian hospital treating about 100 HD patients&#44; this is a net benefit of between &#8364;25&#44;500 and &#8364;51&#44;000&#46; Promoting alternative technologies is a strategy that may lead to better cost-effectiveness and cost-utility for ESRD patients&#46; Also the WUF might reduce the need for the performance of isolated UF sessions in a HD centre which can cost as much as &#8364;287&#46;90 per session&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">WAK and WUF present and future directions</span><p id="par0090" class="elsevierStylePara elsevierViewall">WAK and WUF should evolve to match the clinical and personal needs of each patient&#44; allowing for a better HR-QOL and minimal restrictions in ADL&#46; These aims require considerable technological improvement in the currently used dialysis equipment&#44; in terms of safety&#44; biocompatibility and portability&#46;<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">32</span></a> Certainly&#44; these developments in miniaturization will be the key step to the implementation of the WAK&#47;WUF&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">The first challenge in the implementation of the WAK&#47;WUF is the development of an appropriate vascular access that allows a constant blood flow in the range of 100<span class="elsevierStyleHsp" style=""></span>ml&#47;min&#44; which is adequate for a continuous dialysis therapy&#46; Given the risk of dislodgment&#44; significant haemorrhage and other technical complications&#44; such as air embolism&#44; infection&#44; and clotting&#44; a dual reduced lumen catheter could be a possible solution&#46; This catheter must be constructed using more biocompatible materials and skin exit site technologies&#44; which must ensure minimal risk of infection and clotting&#46; Another important feature is the easy connection and disconnection systems that can be controlled by the patient himself&#46; This catheter should help minimize the risk of associated stenosis&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">As previously mentioned&#44; antithrombogenic materials will be the key constituents not only of the vascular access&#44; but also of the circuit and the dialyser membranes&#46; This circuit system must guarantee the satisfactory performance of all safety systems&#46; Monitoring of ongoing therapy and management of therapeutic prescription should be done remotely through a software solution&#46; Dialyzer dimensions should be reduced and membranes should perfectly mimic physiological functioning of a nephron&#46; Since the dialysate can be continuously regenerated and reused&#44; the amount of dialysate should be lesser than 500 cc while simultaneously having a high adsorption capacity of small and middle size molecules&#46; Given the continuous functioning of the system&#44; large amounts of energy are required&#46; The implementation of energy-efficient and cost effective batteries and fuel cells should be considered&#46;<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">33</span></a></p><p id="par0105" class="elsevierStylePara elsevierViewall">The WAK&#47;WUF pump system should evolve to meet some key needs such as high safety rates&#44; elevated biocompatibility&#44; and should allow for fluxes compatible with patient&#39;s well-being&#44; minimal hemolysis and costs of production as controlled as possible&#46;<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a></p><p id="par0110" class="elsevierStylePara elsevierViewall">Importantly&#44; the WAK&#47;WUF system must be user-friendly to permit self-care&#59; they must be wearable to allow mobility&#59; they also must be affordable&#46; All these characteristics can only be achieved through a joint collaboration of multidisciplinary teams consisting of nephrologists&#44; engineers and economists&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Conclusion</span><p id="par0115" class="elsevierStylePara elsevierViewall">CKD is one of the twenty leading causes of death worldwide&#46; Its&#8217; prevalence has almost doubled between 1990 and 2010 and is expected to continue to increase&#46; Despite the great technical and clinical evolution in RRT&#44; the morbidity and mortality of ESRD patients remain too high and their quality of life precarious&#46; RRT should evolve to match clinical needs such as greater solute clearance&#44; better volume control&#44; improved nutritional status and to reduce ESRD complications&#46; Importantly they must allow a higher health-related quality of life with minimal restrictions in ADL and remove the physical barriers associated with the current available techniques&#46; The economic aspects associated with CKD must also be taken into account&#46; Thus&#44; it is imperative to develop new RRT techniques that fit each patient clinical and personal needs&#46; In this way&#44; the use of a fully portable device&#44; such as WAK and WUF can be a very interesting option for some patients with ESRD that should be considered&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">WAK and WUF still requiring considerable technological improvement in the currently used dialysis equipment&#44; in terms of safety&#44; biocompatibility and portability&#46;<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">32</span></a> Importantly&#44; the development of an appropriate vascular access as well as a good pumping system are also crucial&#44; since it may allow high safety&#44; low hemolysis&#44; and low power consumption&#46;<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Conflict of interests</span><p id="par0125" class="elsevierStylePara elsevierViewall">No conflicts of interest to declare&#46;</p></span></span>"
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          "titulo" => "Introduction"
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          "titulo" => "ESRD and the clinical rationale for WAK"
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        6 => array:2 [
          "identificador" => "sec0015"
          "titulo" => "WAK and WUF evolution"
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          "identificador" => "sec0020"
          "titulo" => "Technical aspects of WAK and WUF"
        ]
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          "identificador" => "sec0025"
          "titulo" => "WAK and WUF economical aspects"
        ]
        9 => array:2 [
          "identificador" => "sec0030"
          "titulo" => "WAK and WUF present and future directions"
        ]
        10 => array:2 [
          "identificador" => "sec0035"
          "titulo" => "Conclusion"
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        11 => array:2 [
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          "titulo" => "Conflict of interests"
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          "titulo" => "References"
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    "tienePdf" => true
    "fechaRecibido" => "2018-03-07"
    "fechaAceptado" => "2018-08-25"
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            0 => "Vascular access"
            1 => "Wearable Artificial Kidney"
            2 => "Wearable Ultrafiltration device"
            3 => "Renal replacement therapy"
            4 => "End-Stage Renal Disease"
            5 => "Health-related quality of life"
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          "palabras" => array:6 [
            0 => "Acceso vascular"
            1 => "Ri&#241;&#243;n Artificial Port&#225;til"
            2 => "Dispositivo de ultrafiltraci&#243;n port&#225;til"
            3 => "Terapia de sustituci&#243;n renal"
            4 => "Enfermedad renal cr&#243;nica terminal"
            5 => "Calidad de vida relacionada con la salud"
          ]
        ]
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">End-Stage Renal Disease &#40;ESRD&#41; is one of the major causes of morbidity and mortality worldwide&#46; Although the incidence of ESRD is relatively stable&#44; the prevalence of maintenance dialysis is increasing&#44; and it is expected to reach a staggering 5439 million patients worldwide by 2030&#46; Despite the great technological evolution that has taken place in recent years&#44; most patients are still treated with in-centre haemodialysis and their prognosis remains far from desirable&#46;</p><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Since 1980&#44; there has been an increasing interest in the development of a portable device for renal replacement therapy &#40;RRT&#41;&#44; which ultimately led to the creation of the Wearable Artificial Kidney &#40;WAK&#41; and the Wearable Ultrafiltration &#40;WUF&#41; system&#46; Portable RRT devices may be acceptable alternatives that deal with several unmet clinical needs of ESRD patients&#46; So far&#44; 3 important human studies with WAK and WUF have been carried out and&#44; although these devices require considerable technological improvement&#44; their safety and efficacy in solute clearance and fluid removal is undeniable&#46;</p><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">In this article&#44; we review the evolution of the WAK and the WUF and the main clinical trials performed&#44; highlighting some of their technical features&#46; Some of the main possible clinical advantages that could be achieved with these devices&#44; as well as some economic aspects&#44; are also pointed out&#46;</p><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">In the future&#44; all renal replacement therapy techniques should evolve to perfectly match the clinical and personal needs of each patient&#44; allowing for an improved health-related quality of life&#46;</p></span>"
      ]
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        "titulo" => "Resumen"
        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">La enfermedad renal cr&#243;nica terminal &#40;ERCT&#41; es una de las principales causas de morbimortalidad mundial&#46; Aunque la incidencia de esta enfermedad es relativamente estable&#44; la prevalencia en di&#225;lisis est&#225; aumentando&#44; y se espera que llegue a la cifra de 5&#46;439 millones de pacientes en todo el mundo en el a&#241;o 2030&#46; A pesar de la gran evoluci&#243;n tecnol&#243;gica ocurrida en los &#250;ltimos a&#241;os&#44; la mayor&#237;a de los pacientes contin&#250;an siendo tratados con hemodi&#225;lisis&#44; y su pron&#243;stico queda lejos de lo deseable&#46;</p><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Desde 1980&#44; existe un inter&#233;s creciente en el desarrollo de dispositivos port&#225;tiles para la terapia de sustituci&#243;n de la funci&#243;n renal &#40;TSFR&#41;&#44; y que llevaron a la creaci&#243;n del Wearable Artificial Kidney &#40;WAK&#41; y del Wearable Ultrafiltration &#40;WUF&#41; system&#46; Estos pueden ser alternativas aceptables que permiten alcanzar las necesidades de los pacientes con ERCT&#44; que hasta ahora no se han alcanzado&#46; A pesar de que estos dispositivos necesitan mejoras tecnol&#243;gicas&#44; su seguridad y eficacia en el aclaramiento de solutos y la eliminaci&#243;n de fluidos es innegable&#46;</p><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Revisamos la evoluci&#243;n del WAK y del WUF&#44; y los principales ensayos cl&#237;nicos desarrollados&#44; destacando algunas de sus particularidades tecnol&#243;gicas&#46; Adicionalmente&#44; se&#241;alamos algunas de las posibles ventajas cl&#237;nicas que podr&#237;an ser alcanzadas con estos dispositivos&#44; as&#237; como algunos aspectos econ&#243;micos&#46;</p><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">En el futuro&#44; todas las TSFR deben evolucionar para satisfacer todas las necesidades cl&#237;nicas y personales de cada paciente&#44; permitiendo una mejor calidad de vida relacionada con la salud&#46;</p></span>"
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          "en" => "<p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">The patient-focused quality pyramid&#46; &#8220;Fundamentals&#8221; are the basic clinical data&#44; &#8220;Complex Programs&#8221; refers to clinical programs based on fundamental clinical areas&#59; &#8220;Measures of effectiveness&#8221; refers to primary outcomes driven by lower complex programs and fundamental clinical areas of focus&#59; &#8220;What matters most&#8221; are the outcomes that improve HR-QOL&#46; AVF&#44; arteriovenous fistula&#59; CVD&#44; cardiovascular disease&#59; CVC&#44; central venous catheter&#59; EOL&#44; end of life&#59; HR-QOL&#44; health-related quality of life&#59; MBD&#44; mineral and bone disorder&#59; Med&#44; medical&#59; mgmt&#44; management&#59; Pt&#46;&#44; patient&#59; PTH&#44; parathyroid hormone&#59; tx&#44; treatment&#59; URR&#44; urea reduction ratio&#46;</p> <p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Adapted from Ref&#46; <a class="elsevierStyleCrossRef" href="#bib0390">31</a>&#46;</p>"
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          "en" => "<p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">Diagram of WAK&#46; Color code &#8211; Red&#58; blood from patient&#59; Blue&#58; blood to patient&#59; Yellow&#58; dialysate to ultrafiltrate&#46;</p>"
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                      "titulo" => "Continuous renal replacement therapy for end-stage renal disease&#46; The wearable artificial kidney &#40;WAK&#41;"
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                        0 => array:2 [
                          "etal" => false
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                            0 => "V&#46; Gura"
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Brief review
How can we advance in renal replacement therapy techniques?
¿Cómo podemos progresar en las técnicas de sustitución de la función renal?
Ana Castroa,b,
Corresponding author
ana.coutinho.castro@gmail.com

Corresponding author.
, Mauro Nerib, Akash Nayak Karopadib,c, Anna Lorenzinb, Nicola Marchionnab,d, Claudio Roncob,d
a Department of Nephrology, Dialysis and Transplantation, Oporto Hospital Centre, Largo Prof. Abel Salazar, 4099-001 Porto, Portugal
b International Renal Research Institute of Vicenza (IRRIV), IRRIV-San Bortolo Hospital AULSS 8 Berica, Viale Rodolfi, 37, 36100 Vicenza, Italy
c Dr. Nayak Dialysis Centres Private, Limited, 12-2-718, Nanal Nagar, X Roads, Toli Chowki, Hyderabad, Telangana 500008, India
d Department of Nephrology, Dialysis and Transplantation, Ospedale San Bortolo, San Bortolo Hospital AULSS 8 Berica, Viale Rodolfi, 37, 36100 Vicenza, Italy
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In addition to traditional risk factors&#44; CVD morbi-mortality is also associated with uremia-related factors &#40;URF&#41; such as fluid overload&#44; hyperphosphatemia&#44; anemia&#44; left ventricular hypertrophy&#44; chronic inflammation and endothelial dysfunction&#46;<a class="elsevierStyleCrossRefs" href="#bib0490"><span class="elsevierStyleSup">9&#8211;12</span></a> Due to the inherent inability of the traditional thrice weekly HD regimen to completely replace renal function and to optimize all URF&#44; ESRD patients are required to follow stringent dietary restrictions &#40;especially in potassium&#44; phosphorus and total fluid intake&#41; and to regularly consume a large number of oral medications&#46; Recent studies have suggested that some of the benefits of high frequency and long duration dialysis are similar to those associated with kidney transplantation&#44; due to the achievement of greater solute clearance&#44; better volume control&#44; better nutritional status and a higher health-related quality of life &#40;HR-QOL&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0495"><span class="elsevierStyleSup">13&#8211;15</span></a> It is also accompanied by a reduction of ESRD related complications such as anemia&#44; hypertension&#44; hospitalization and need for additional medication &#40;e&#46;g&#46; such as phosphate binders and antihypertensive therapy&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">16</span></a> Improvement of the blood pressure control associated with a reduced risk of intradialytic hypotension and a more physiological ultrafiltration &#40;UF&#41; rate during prolonged HD&#44; may prevent cardiac stunning and thus reduce the risk of CVD related morbi-mortality in ESRD patients&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Residual Renal Function &#40;RRF&#41; plays a key role in ESRD patients especially for fluid&#44; salt and phosphorus excretion&#44; for clearance of middle size molecules and also for endogenous vitamin D and erythropoietin production&#46;<a class="elsevierStyleCrossRefs" href="#bib0320"><span class="elsevierStyleSup">17&#44;18</span></a> It is associated with better patient survival and greater health-related quality of life &#40;HR-QOL&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0510"><span class="elsevierStyleSup">19</span></a> Generally&#44; conventional HD treatments are performed with a fixed dose of thrice-weekly&#44; without considering RRF&#46; Preservation of RRF requires a holistic approach through regular monitoring&#44; blood pressure control optimization&#44; elimination of nephrotoxins and an individualized dialysis prescription&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Most dialysis patients have low HR-QOL which is an independent predictor of mortality in this population&#46;<a class="elsevierStyleCrossRefs" href="#bib0335"><span class="elsevierStyleSup">20&#8211;22</span></a> Dismal HR-QOL scores are partly explained by the co-existing comorbidities&#44; but also by depression and the relatively high symptom burden&#46;<a class="elsevierStyleCrossRefs" href="#bib0350"><span class="elsevierStyleSup">23&#44;24</span></a> Conventional HD regimen not only markedly limits patient freedom&#44; but also can be associated with severe post-dialysis fatigue that can further negatively impact HR-QOL&#46;<a class="elsevierStyleCrossRefs" href="#bib0355"><span class="elsevierStyleSup">24&#44;25</span></a> HR-QOL is a critical issue&#44; being used to assess the effectiveness of healthcare interventions and it is becoming as important as morbidity and mortality while evaluating outcomes in dialysis patients&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">26</span></a> Manns et al&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">27</span></a> reported 30 important concerns for ESRD patients and found that although they do care about effects of dialysis modality on overall survival&#44; they also worry about fatigue&#44; depression&#44; better quality of life&#44; a good dialysis access&#44; the ability to travel and to exercise and to eliminate barriers that hamper their ADL&#46; Many ESRD patients have expressed interest in portable dialysis options&#46;<a class="elsevierStyleCrossRefs" href="#bib0370"><span class="elsevierStyleSup">27&#44;28</span></a> Since 2009&#44; the US Institute of Medicine and the Patient Centred Outcomes Research Institute have promoted patient-centred care and it is also incentivized by the US Centres for Medicare and Medicaid services in designing quality programs for the ESRD population&#46;<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">29</span></a> Based on this concept&#44; Nissenson et al&#46; proposed a Maslow-like &#8220;quality pyramid&#8221; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#44; in which HR-QOL occupies the apex&#44; supported by mortality&#44; hospitalization and patient experience&#46;<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">30</span></a> According to this&#44; dialysis patients&#8217; treatment&#44; which until recently was focused only on the assurance of fundamental clinical aspects &#40;such as volume control&#44; anemia and calcium-phosphorus metabolism&#41; and outcomes&#44; must also aspire for goals such as improved HR-QOL&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">WAK and WUF evolution</span><p id="par0025" class="elsevierStylePara elsevierViewall">The initial idea of the WAK traces back to the 1970s&#46; However&#44; it was limited by the technologies available at that time&#46;<a class="elsevierStyleCrossRefs" href="#bib0390"><span class="elsevierStyleSup">31&#8211;33</span></a> Mobility was one of the major limitations found&#44; since the earlier device weighed almost 6&#46;35<span class="elsevierStyleHsp" style=""></span>kg &#40;14 pounds&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">31</span></a> Only recently&#44; the developments in technology and miniaturization have made wearable dialysis portable devices relatively practicable&#46; The first trial to assess safety and efficacy of the WAK was reported in 2005 in animal models&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a> Two years later&#44; this device was tested in a pilot study involving 8 HD patients with a mean age of 51&#46;7 years&#46;<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">35</span></a> They were connected to a device weighing 5<span class="elsevierStyleHsp" style=""></span>kg &#40;Xcorporeal Inc&#44; Los Angeles&#44; CA&#44; USA&#41;&#44; using a standard HD vascular access&#46; The total system was composed of a bi-compartmental circuit&#44; one for the blood and the other for the dialyzer&#59; a polysulfone 0&#46;6<span class="elsevierStyleHsp" style=""></span>m<span class="elsevierStyleSup">2</span> high flux dialyser &#40;Gambro Dialysatoren&#44; Hechingen&#44; Germany&#41;&#59; a pulsatile blood pump&#44; powered by a standard 9-V battery&#59; four micro-pumps &#40;Sorenson&#44; West Jordan&#44; UT&#44; USA&#41; used to infuse heparin into the blood circuit&#44; to infuse sodium bicarbonate&#44; magnesium&#44; and calcium acetate into the dialysate circuit&#44; and to control ultrafiltration&#46; A series of sorbent canisters containing urease&#44; activated charcoal&#44; hydroxyl zirconium oxide and zirconium phosphate were used to regenerate dialysate&#46; For safety two sensors for detection of air bubbles and of blood flow stoppage were used&#46; The mean treatment time was 6&#46;4 &#40;SD<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;0&#41; h&#46; There was no evidence of important cardiovascular changes&#44; hemolysis&#44; serum electrolytes disturbances or acid-base balance disturbances&#46; There was a statistically lower mean body weight after treatment&#46; Clearance rates for urea and creatinine were much lower than those typically achieved in conventional HD&#46; The mean blood flow was 58&#46;6<span class="elsevierStyleHsp" style=""></span>mL&#47;min&#44; with a dialysate flow of 47&#46;1<span class="elsevierStyleHsp" style=""></span>mL&#47;min&#46; The clotting of the vascular access that was observed in two patients was related to low heparin dose&#46; In one patient a fistula needle got dislodged&#44; but the blood pump stopped immediately&#44; without any sequelae&#46; The other technical problem occurred due to the accumulation of carbon dioxide bubbles in dialysate circuit&#44; but this did not imply the discontinuation of the treatment&#46; Despite the above technical difficulties&#44; the patient&#39;s feedback was encouraging&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">A growing body of evidence&#44; involving New York Heart Association &#40;NYHA&#41; class III and IV congestive heart failure &#40;CHF&#41; patients resistant to diuretics&#44; suggests that the removal of excess fluid&#44; cytokines and a myocardial depressant factor through ultrafiltration therapy is associated with better outcomes&#46;<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">36</span></a> However&#44; when UF is performed during a regular 4&#8211;6<span class="elsevierStyleHsp" style=""></span>h HD session&#44; it can result in hypotension and hemodynamic instability&#46; Gura et al&#46; in 2008&#44; described the first wearable hemofiltration device &#40;WUF&#41; to manage fluid overload&#46;<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a> This pilot study enrolled 6 fluid-overloaded HD patients in which isolated UF was applied for 6<span class="elsevierStyleHsp" style=""></span>h&#46; The average blood flow was 116<span class="elsevierStyleHsp" style=""></span>ml&#47;min and UF rate ranged between 120 and 288<span class="elsevierStyleHsp" style=""></span>ml&#47;h&#46; Cardiovascular and biochemical parameters remained stable and there were no major complications&#46; Clinically&#44; the WUF can potentially reduce the incidence of acute pulmonary edema&#44; ascites and other hypervolemic manifestations in patients with CHF NYHA Class III and IV&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">In 2016&#44; Gura et al published the first-ever human clinical trial which involved a 24<span class="elsevierStyleHsp" style=""></span>h WAK treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a> Seven HD patients were selected to perform a WAK treatment for 24<span class="elsevierStyleHsp" style=""></span>hours&#46; Their mean age was 49 years and 3 had CHF&#46; The mean blood flow was 42<span class="elsevierStyleHsp" style=""></span>ml&#47;min and dialysate flow was 43<span class="elsevierStyleHsp" style=""></span>ml&#47;min&#46; Mean weighted-average concentrations of blood urea nitrogen &#40;BUN&#41; and &#946;2-microglobulin were significantly lower during the 24-hour WAK treatment than those achieved in the previous 48-hour period by the conventional HD treatment&#46; The mean UF volume of the 5 subjects that completed the 24-hour treatment was 1002<span class="elsevierStyleHsp" style=""></span>ml and there were no significant hemodynamic changes&#46; The treatment was stopped in 2 patients due to technical complications&#58; namely clotting of the blood circuit in 1 subject and the appearance of a pink discoloration in the dialysate&#44; without analytic evidence of hemolysis&#44; in another&#46; After the seventh patient&#44; the clinical trial was discontinued due to technical issues&#44; such as development of excessive carbon dioxide bubbles in the dialysate circuit&#44; tubing kinks which caused fluctuation in blood and dialysate flow rates related to inconstant pump function&#46; There were no important cardiovascular changes&#44; acid&#8211;base disturbances&#44; or electrolytic serum disturbances&#46; The target UF was achieved and there was no need of dietary restriction or phosphorus-binding medications&#46; Patients reported a significantly greater satisfaction with the WAK&#44; owing to the greater freedom&#44; its convenience and its flexibility&#46;<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Technical aspects of WAK and WUF</span><p id="par0040" class="elsevierStylePara elsevierViewall">The Wearable Artificial Kidney &#40;WAK&#41; is a wearable &#40;using a belt&#41; HD device that incorporates the basic components of a dialysis system into a wearable device&#44; permitting miniaturization&#44; patient-oriented management&#44; and improved mobility&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a> It works by drawing blood from the patient&#39;s vascular access and&#44; using heparin and a pump system&#44; and circulates it through the blood channel into the dialyzer&#46; The dialyzed blood is then returned to the patient&#46; The dialysate and the blood circulates in a counter-current direction&#46; Another pump empties the spent dialysate into a collection bag&#46; After going through a series of sorbents and being infused with a solution containing sodium bicarbonate&#44; the dialysate is returned to the dialyser&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">The mainly technical components are as follows&#58; pumping systems&#59; dialysis membranes&#59; dialysis regenerations&#59; patient monitoring systems and power sources &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0050" class="elsevierStylePara elsevierViewall">The WAK&#47;WUF pumping system possibly is the most critical technical component since it is responsible for ensuring adequate blood flow&#44; precise fluid exchange and drug infusion&#46; The pumping system can be further subdivided into blood pumps and other fluid pumps&#46; Blood pumps are responsible for extracting blood from the patient&#39;s vascular access&#44; and for providing the minimum reliable and adjustable blood flow through the filter and for returning the filtered blood to the patient&#46; Importantly&#44; all this dynamic flow has to be done without hemolysis and with the highest possible biocompatibility&#46; There are different types of blood pumps&#44; such as peristaltic&#44; shuttle&#44; rotary and finger pumps with different specifications&#46;<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a> Fluid pumps&#44; on the other hand allow for the delivery of drugs&#44; medications&#44; anticoagulants&#44; antibiotics etc&#46; or remove fluids and solutes from the extracorporeal circuit&#46; Additionally&#44; there are at least two more types of fluids pumps&#58; kinetic centrifugal and turbine pumps&#46;<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a> At the moment there is no WAK pump that has incorporates all the best characteristics into a single integrated system&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">WAK is a portable device used for long-term hemodialysis&#44; so it is easily understood that in addition to the usual requirements of a dialysis membrane&#44; the membranes used in this device should have some additional features related to portability and dialysis time&#46; In fact&#44; WAK dialysis membranes should have a geometry which allows for a replaceable disposable pump&#44; an effective surface area and pore distribution for longer treatment time and cannot have any associated haemolysis&#46;<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a> In the last years several advances in the development of dialysis membranes were made&#44; namely the lightweight hemofilter unit<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">33</span></a> and the application of mechanical vibration to induce high shear stress at the membrane surface with the aim of preserving membrane morphology and function for extended time periods&#46;<a class="elsevierStyleCrossRef" href="#bib0435"><span class="elsevierStyleSup">40</span></a> Other flourishing areas for dialysis membranes are the development of improved biocompatible materials and nanotechnology&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">Another important feature of the WAK is a dialysate regeneration system that has to be lightweight&#44; has to replace smart sorbent material with high adsorption capacity of uremic toxins and also has to accurately monitor the dialysate composition &#40;with pH&#44; temperature&#44; volume&#44; composition and bacterial contamination sensors&#41;&#46; These requirements have been largely achieved with the use of sorbent technology&#46;<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a> Kim et al demonstrated that in vitro&#44; a cold dialysate regeneration system using a small volume of dialysate can have results comparable to conventional HD&#46;<a class="elsevierStyleCrossRef" href="#bib0440"><span class="elsevierStyleSup">41</span></a> A promising system for the application of the WAK is the REDY cartridge&#44; which allows for the regeneration of 6L of dialysate per dialysis session&#46; This cartridge is composed of charcoal&#44; urease&#44; cation and an anion exchanger&#46; The evolution of this technology could overcome some of the previous problems related to the toxicity of aluminium and acidosis&#46; However&#44; this is yet to be miniaturized&#46;<a class="elsevierStyleCrossRef" href="#bib0405"><span class="elsevierStyleSup">34</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">Another key component of the WAK&#47;WUF is the patient monitoring system&#46; This is comprised of several sensors&#58; fluid balance&#44; pressure maintenance in the dialysis system&#44; pump power battery&#44; blood leakage and bubble detection&#44; as well as vascular access disconnection&#46;<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">42</span></a> In the future&#44; it is intended that the control of these systems should be done remotely in order to continuously monitor and adjust the clinical parameters of the treatment&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">The power consumption of a WAK with a maximum pump flow rate of 120<span class="elsevierStyleHsp" style=""></span>ml&#47;min requires less than 5<span class="elsevierStyleHsp" style=""></span>W&#44;<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a> limiting the use of lithium batteries&#46; A promising innovations for WAK&#47;WUF could be thin-film&#44; solid-state batteries<a class="elsevierStyleCrossRef" href="#bib0445"><span class="elsevierStyleSup">42</span></a> and flexible batteries&#46;<a class="elsevierStyleCrossRef" href="#bib0450"><span class="elsevierStyleSup">43</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">The vascular access is the lifeline of most HD patients&#46; The WAK&#47;WUF vascular access must allow comfortable&#44; prolonged and frequent dialysis treatments&#44; without interference in ADL&#46; AVF is the preferred vascular access for HD&#46; However&#44; a small needle dislodgment can result in severe complications&#44; such as active bleeding&#44; putting the patient&#39;s life at risk&#46; Similar complications may also occur in grafts&#46; Prolonged HD with these two portable devices will need a modified vascular access system with safe and convenient connection&#47;disconnection systems&#44; and with reduced risk of biofilms formation and coagulation&#46; Taking previous experiences into consideration&#44; it seems reasonable that the future WAK&#47;WUF vascular access should be similar to a reduced lumen CVC with optimized aspects such as a port and more biocompatible materials which will have reduced associated risk of infection and coagulation&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">WAK and WUF economical aspects</span><p id="par0080" class="elsevierStylePara elsevierViewall">Although ESRD typically affects elderly people&#44; many young people with active professional life are also affected by it&#46; As a result&#44; ESRD in young people leads to interruptions in schedules&#44; reduced capacity to work due to forced absenteeism and sometimes even forces early retirement&#46; Kaitelidou et al&#46;<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">44</span></a> in an economic evaluation of HD in Greece demonstrated an overall loss of 2046 years due to mortality and a potential productivity loss amounting to 9&#46;9 million Euro&#44; according to human capital approach &#40;HCA&#41;&#46; Importantly&#44; in this study the total morbidity cost due to absence from work and early retirement was estimated at an amount exceeding 273 million Euro according to HCA&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">In selected patients WUF treatment can possibly reduce morbi-mortality&#44; by reducing the number of hospital admissions&#44; the length of hospital stay&#44; the ICU utilization and overall drug consumption&#46;<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">44</span></a> It is likely that this treatment could be beneficial to ESRD patients in terms of a reduced number of hospitalizations per year due to acute decompensated heart failure &#40;ADHF&#41;&#46; About a decade ago the UNLOAD trial&#44; which was conducted to investigate if UF therapy was superior to IV diuretics in the treatment of ADHF or not&#44; clearly proved that UF therapy significantly reduced the CHF hospitalization rates&#46; At 90 days&#44; the UF group versus the IV diuretics group had fewer patients rehospitalised for heart failure &#40;HF&#41; &#40;16 of 89 &#91;18&#37;&#93; vs&#46; 28 of 87 &#91;32&#37;&#93;&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;037&#41;&#44; fewer HF rehospitalisations &#40;0&#46;22<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;54 vs&#46; 0&#46;46<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;76&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;022&#41;&#44; and fewer rehospitalisation days &#40;1&#46;4<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#46;2 vs&#46; 3&#46;8<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#46;5&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;022&#41; per patient&#46;<a class="elsevierStyleCrossRef" href="#bib0460"><span class="elsevierStyleSup">45</span></a> We are also aware that hospitalizations for ADHF carry a significant economic burden for any healthcare system&#46; For example it was estimated that in an Italian hospital&#44; the average yearly cost per person for hospitalization for heart failure &#40;HHF&#41; was &#8364;11&#44;100&#44; of which &#8364;4300 euro was for the index hospitalization &#40;39&#37;&#41;&#44; &#8364;5900 for the subsequent hospitalizations &#40;53&#37;&#41;&#44; and the remaining &#8364;900 for non-hospital charges &#40;8&#37;&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0465"><span class="elsevierStyleSup">46</span></a> From the two above studies&#44; it is not unreasonable to assume that the use of the WUF device could have similar results&#44; i&#46;e&#46; a 50&#37; reduction in rehospitalisations and a 50&#37; reduction in rehospitalisation days if not more&#46; Considering the costs in an Italian hospital&#44; this reduction could hence lead to calculated savings of approximately &#8364;5100 per patient if we assume a 75&#37; reduction in non-index-hospitalization costs owing to a 50&#37; reduction in the number of HHF and 50&#37; reduction in the length of HHF&#46; Even if we consider a conservative figure of 5&#8211;10 HHF every year&#44; which is typical in a large Italian hospital treating about 100 HD patients&#44; this is a net benefit of between &#8364;25&#44;500 and &#8364;51&#44;000&#46; Promoting alternative technologies is a strategy that may lead to better cost-effectiveness and cost-utility for ESRD patients&#46; Also the WUF might reduce the need for the performance of isolated UF sessions in a HD centre which can cost as much as &#8364;287&#46;90 per session&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">WAK and WUF present and future directions</span><p id="par0090" class="elsevierStylePara elsevierViewall">WAK and WUF should evolve to match the clinical and personal needs of each patient&#44; allowing for a better HR-QOL and minimal restrictions in ADL&#46; These aims require considerable technological improvement in the currently used dialysis equipment&#44; in terms of safety&#44; biocompatibility and portability&#46;<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">32</span></a> Certainly&#44; these developments in miniaturization will be the key step to the implementation of the WAK&#47;WUF&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">The first challenge in the implementation of the WAK&#47;WUF is the development of an appropriate vascular access that allows a constant blood flow in the range of 100<span class="elsevierStyleHsp" style=""></span>ml&#47;min&#44; which is adequate for a continuous dialysis therapy&#46; Given the risk of dislodgment&#44; significant haemorrhage and other technical complications&#44; such as air embolism&#44; infection&#44; and clotting&#44; a dual reduced lumen catheter could be a possible solution&#46; This catheter must be constructed using more biocompatible materials and skin exit site technologies&#44; which must ensure minimal risk of infection and clotting&#46; Another important feature is the easy connection and disconnection systems that can be controlled by the patient himself&#46; This catheter should help minimize the risk of associated stenosis&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">As previously mentioned&#44; antithrombogenic materials will be the key constituents not only of the vascular access&#44; but also of the circuit and the dialyser membranes&#46; This circuit system must guarantee the satisfactory performance of all safety systems&#46; Monitoring of ongoing therapy and management of therapeutic prescription should be done remotely through a software solution&#46; Dialyzer dimensions should be reduced and membranes should perfectly mimic physiological functioning of a nephron&#46; Since the dialysate can be continuously regenerated and reused&#44; the amount of dialysate should be lesser than 500 cc while simultaneously having a high adsorption capacity of small and middle size molecules&#46; Given the continuous functioning of the system&#44; large amounts of energy are required&#46; The implementation of energy-efficient and cost effective batteries and fuel cells should be considered&#46;<a class="elsevierStyleCrossRef" href="#bib0400"><span class="elsevierStyleSup">33</span></a></p><p id="par0105" class="elsevierStylePara elsevierViewall">The WAK&#47;WUF pump system should evolve to meet some key needs such as high safety rates&#44; elevated biocompatibility&#44; and should allow for fluxes compatible with patient&#39;s well-being&#44; minimal hemolysis and costs of production as controlled as possible&#46;<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a></p><p id="par0110" class="elsevierStylePara elsevierViewall">Importantly&#44; the WAK&#47;WUF system must be user-friendly to permit self-care&#59; they must be wearable to allow mobility&#59; they also must be affordable&#46; All these characteristics can only be achieved through a joint collaboration of multidisciplinary teams consisting of nephrologists&#44; engineers and economists&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Conclusion</span><p id="par0115" class="elsevierStylePara elsevierViewall">CKD is one of the twenty leading causes of death worldwide&#46; Its&#8217; prevalence has almost doubled between 1990 and 2010 and is expected to continue to increase&#46; Despite the great technical and clinical evolution in RRT&#44; the morbidity and mortality of ESRD patients remain too high and their quality of life precarious&#46; RRT should evolve to match clinical needs such as greater solute clearance&#44; better volume control&#44; improved nutritional status and to reduce ESRD complications&#46; Importantly they must allow a higher health-related quality of life with minimal restrictions in ADL and remove the physical barriers associated with the current available techniques&#46; The economic aspects associated with CKD must also be taken into account&#46; Thus&#44; it is imperative to develop new RRT techniques that fit each patient clinical and personal needs&#46; In this way&#44; the use of a fully portable device&#44; such as WAK and WUF can be a very interesting option for some patients with ESRD that should be considered&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">WAK and WUF still requiring considerable technological improvement in the currently used dialysis equipment&#44; in terms of safety&#44; biocompatibility and portability&#46;<a class="elsevierStyleCrossRef" href="#bib0395"><span class="elsevierStyleSup">32</span></a> Importantly&#44; the development of an appropriate vascular access as well as a good pumping system are also crucial&#44; since it may allow high safety&#44; low hemolysis&#44; and low power consumption&#46;<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Conflict of interests</span><p id="par0125" class="elsevierStylePara elsevierViewall">No conflicts of interest to declare&#46;</p></span></span>"
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          "titulo" => "ESRD and the clinical rationale for WAK"
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          "titulo" => "WAK and WUF evolution"
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          "titulo" => "WAK and WUF present and future directions"
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            0 => "Vascular access"
            1 => "Wearable Artificial Kidney"
            2 => "Wearable Ultrafiltration device"
            3 => "Renal replacement therapy"
            4 => "End-Stage Renal Disease"
            5 => "Health-related quality of life"
          ]
        ]
      ]
      "es" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Palabras clave"
          "identificador" => "xpalclavsec1170943"
          "palabras" => array:6 [
            0 => "Acceso vascular"
            1 => "Ri&#241;&#243;n Artificial Port&#225;til"
            2 => "Dispositivo de ultrafiltraci&#243;n port&#225;til"
            3 => "Terapia de sustituci&#243;n renal"
            4 => "Enfermedad renal cr&#243;nica terminal"
            5 => "Calidad de vida relacionada con la salud"
          ]
        ]
      ]
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      "en" => array:2 [
        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">End-Stage Renal Disease &#40;ESRD&#41; is one of the major causes of morbidity and mortality worldwide&#46; Although the incidence of ESRD is relatively stable&#44; the prevalence of maintenance dialysis is increasing&#44; and it is expected to reach a staggering 5439 million patients worldwide by 2030&#46; Despite the great technological evolution that has taken place in recent years&#44; most patients are still treated with in-centre haemodialysis and their prognosis remains far from desirable&#46;</p><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Since 1980&#44; there has been an increasing interest in the development of a portable device for renal replacement therapy &#40;RRT&#41;&#44; which ultimately led to the creation of the Wearable Artificial Kidney &#40;WAK&#41; and the Wearable Ultrafiltration &#40;WUF&#41; system&#46; Portable RRT devices may be acceptable alternatives that deal with several unmet clinical needs of ESRD patients&#46; So far&#44; 3 important human studies with WAK and WUF have been carried out and&#44; although these devices require considerable technological improvement&#44; their safety and efficacy in solute clearance and fluid removal is undeniable&#46;</p><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">In this article&#44; we review the evolution of the WAK and the WUF and the main clinical trials performed&#44; highlighting some of their technical features&#46; Some of the main possible clinical advantages that could be achieved with these devices&#44; as well as some economic aspects&#44; are also pointed out&#46;</p><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">In the future&#44; all renal replacement therapy techniques should evolve to perfectly match the clinical and personal needs of each patient&#44; allowing for an improved health-related quality of life&#46;</p></span>"
      ]
      "es" => array:2 [
        "titulo" => "Resumen"
        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">La enfermedad renal cr&#243;nica terminal &#40;ERCT&#41; es una de las principales causas de morbimortalidad mundial&#46; Aunque la incidencia de esta enfermedad es relativamente estable&#44; la prevalencia en di&#225;lisis est&#225; aumentando&#44; y se espera que llegue a la cifra de 5&#46;439 millones de pacientes en todo el mundo en el a&#241;o 2030&#46; A pesar de la gran evoluci&#243;n tecnol&#243;gica ocurrida en los &#250;ltimos a&#241;os&#44; la mayor&#237;a de los pacientes contin&#250;an siendo tratados con hemodi&#225;lisis&#44; y su pron&#243;stico queda lejos de lo deseable&#46;</p><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Desde 1980&#44; existe un inter&#233;s creciente en el desarrollo de dispositivos port&#225;tiles para la terapia de sustituci&#243;n de la funci&#243;n renal &#40;TSFR&#41;&#44; y que llevaron a la creaci&#243;n del Wearable Artificial Kidney &#40;WAK&#41; y del Wearable Ultrafiltration &#40;WUF&#41; system&#46; Estos pueden ser alternativas aceptables que permiten alcanzar las necesidades de los pacientes con ERCT&#44; que hasta ahora no se han alcanzado&#46; A pesar de que estos dispositivos necesitan mejoras tecnol&#243;gicas&#44; su seguridad y eficacia en el aclaramiento de solutos y la eliminaci&#243;n de fluidos es innegable&#46;</p><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Revisamos la evoluci&#243;n del WAK y del WUF&#44; y los principales ensayos cl&#237;nicos desarrollados&#44; destacando algunas de sus particularidades tecnol&#243;gicas&#46; Adicionalmente&#44; se&#241;alamos algunas de las posibles ventajas cl&#237;nicas que podr&#237;an ser alcanzadas con estos dispositivos&#44; as&#237; como algunos aspectos econ&#243;micos&#46;</p><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">En el futuro&#44; todas las TSFR deben evolucionar para satisfacer todas las necesidades cl&#237;nicas y personales de cada paciente&#44; permitiendo una mejor calidad de vida relacionada con la salud&#46;</p></span>"
      ]
    ]
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        "etiqueta" => "Fig&#46; 1"
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          "en" => "<p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">The patient-focused quality pyramid&#46; &#8220;Fundamentals&#8221; are the basic clinical data&#44; &#8220;Complex Programs&#8221; refers to clinical programs based on fundamental clinical areas&#59; &#8220;Measures of effectiveness&#8221; refers to primary outcomes driven by lower complex programs and fundamental clinical areas of focus&#59; &#8220;What matters most&#8221; are the outcomes that improve HR-QOL&#46; AVF&#44; arteriovenous fistula&#59; CVD&#44; cardiovascular disease&#59; CVC&#44; central venous catheter&#59; EOL&#44; end of life&#59; HR-QOL&#44; health-related quality of life&#59; MBD&#44; mineral and bone disorder&#59; Med&#44; medical&#59; mgmt&#44; management&#59; Pt&#46;&#44; patient&#59; PTH&#44; parathyroid hormone&#59; tx&#44; treatment&#59; URR&#44; urea reduction ratio&#46;</p> <p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Adapted from Ref&#46; <a class="elsevierStyleCrossRef" href="#bib0390">31</a>&#46;</p>"
        ]
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      1 => array:7 [
        "identificador" => "fig0010"
        "etiqueta" => "Fig&#46; 2"
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          "en" => "<p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">Diagram of WAK&#46; Color code &#8211; Red&#58; blood from patient&#59; Blue&#58; blood to patient&#59; Yellow&#58; dialysate to ultrafiltrate&#46;</p>"
        ]
      ]
    ]
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                            0 => "R&#46; Saran"
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                      "doi" => "10.1053/j.ajkd.2017.01.040"
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                        "fecha" => "2017"
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                        "numero" => "S1"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/28434525"
                            "web" => "Medline"
                          ]
                        ]
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                    ]
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                ]
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                    0 => array:2 [
                      "titulo" => "Daily hemodialysis&#58; an update"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:1 [
                            0 => "A&#46; Pierratos"
                          ]
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                      ]
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                  ]
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                    0 => array:2 [
                      "doi" => "10.1097/00041552-200203000-00006"
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                          "etal" => false
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                          ]
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                          "etal" => false
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                        "fecha" => "2001"
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                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Continuous renal replacement therapy for end-stage renal disease&#46; The wearable artificial kidney &#40;WAK&#41;"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:4 [
                            0 => "V&#46; Gura"
                            1 => "M&#46; Beizai"
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                          ]
                        ]
                      ]
                    ]
                  ]
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                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            8 => array:3 [
              "identificador" => "bib0490"
              "etiqueta" => "9"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Kidney disease as a risk factor for development of cardiovascular disease&#58; a statement from the American Heart Association Councils on Kidney in Cardiovascular Disease&#46; High Blood Pressure Research Clinical Cardiology&#44; and Epidemiology and Prevention"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:6 [
                            0 => "M&#46;J&#46; Sarnak"
                            1 => "A&#46;S&#46; Levey"
                            2 => "A&#46;C&#46; Schoolwerth"
                            3 => "J&#46; Coresh"
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                          ]
                        ]
                      ]
                    ]
                  ]
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                    0 => array:2 [
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                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            9 => array:3 [
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              "etiqueta" => "10"
              "referencia" => array:1 [
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                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:1 [
                            0 => "A&#46;J&#46; Collins"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1097/00000441-200304000-00002"
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                        "fecha" => "2003"
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                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            10 => array:3 [
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              "etiqueta" => "11"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Emerging biomarkers for evaluating cardiovascular risk in the chronic kidney disease patient&#58; how do new pieces fit into the uremic puzzle&#63;"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:6 [
                            0 => "P&#46; Stenvinkel"
                            1 => "J&#46;J&#46; Carrero"
                            2 => "J&#46; Axelsson"
                            3 => "B&#46; Lindholm"
                            4 => "O&#46; Heimb&#252;rger"
                            5 => "Z&#46; Massy"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.2215/CJN.03670807"
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                        "fecha" => "2008"
                        "volumen" => "3"
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                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
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                  "contribucion" => array:1 [
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                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:2 [
                            0 => "J&#46; Kendrick"
                            1 => "M&#46;B&#46; Chonchol"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1038/ncpneph0954"
                      "Revista" => array:6 [
                        "tituloSerie" => "Nat Clin Pract Nephrol"
                        "fecha" => "2008"
                        "volumen" => "4"
                        "paginaInicial" => "672"
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                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/18825155"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            12 => array:3 [
              "identificador" => "bib0495"
              "etiqueta" => "13"
              "referencia" => array:1 [
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                      "titulo" => "In-center hemodialysis six times per week versus three times per week"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:6 [
                            0 => "F&#46;H&#46;N&#46; Trial Group"
                            1 => "G&#46;M&#46; Chertow"
                            2 => "N&#46;W&#46; Levin"
                            3 => "G&#46;J&#46; Beck"
                            4 => "T&#46;A&#46; Depner"
                            5 => "P&#46;W&#46; Eggers"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1056/NEJMoa1001593"
                      "Revista" => array:6 [
                        "tituloSerie" => "N Engl J Med&#46;"
                        "fecha" => "2010"
                        "volumen" => "363"
                        "paginaInicial" => "2287"
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ISSN: 20132514
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