Continuous extrarenal treatment without anticoagulation therapy
Depuración extrarrenal continua sin anticoagulación
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The continuous nature of the technique, therefore, requires an anticoagulation system to guarantee its effectiveness, optimise the survival of the circuit and reduce blood loss due to filter coagulation.<span class="elsevierStyleSup">1</span> However, this will increase the risk of haemorrhage already run by these patients. Furthermore, turbulent blood flow and interaction of the membrane with platelets could induce platelet dysfunction, which increases the risk of haemorrhage.<span class="elsevierStyleSup">2</span> The objective is to keep the filter, the extracorporeal lines and the catheters free of clots, avoiding a systemic anticoagulation that favours haemorrhage complications. The need for anticoagulants will depend on technical factors, such as the applied blood flow or the type of the filter membrane, as well as on patient-related factors, namely the hepatic function and the number of platelets. It is important to understand the intrinsic mechanisms involved in the premature coagulation of the filter¿s circuit to optimise anticoagulation and keep the filter from coagulating for the longest amount of time possible. Many studies have been carried out, one by Tank et al,<span class="elsevierStyleSup">3</span> which shows that continuous extrarenal treatment in critically ill patients at a high risk of haemorrhage can be performed without anticoagulation, which minimises the risk of haemorrhage and it is linked with an acceptable filter lifetime.</p><p class="elsevierStylePara">The objective of our study is to examine the lifetime of the filters used in techniques of continuous renal treatment, with or without anticoagulation, for critically ill patients with or without coagulopathy. For this reason, a prospective, cohort study was carried out in a polyvalent intensive care unit of a third-level hospital for a period of four months. Patients at a high risk of haemorrhage were included, i.e. those who suffered from active bleeding or had an episode of major bleeding during the last 48 hours, the 24 hours post operation or those who had a Quick index of < 50% and/or aPTT of > 60 seconds and/or a platelet count of < 60,000/ml. The Prisma system was used on all the patients with predilution replacement, which was present in patients with renal failure (acute or chronic) and haemodynamic instability, requiring liquids management and controlling electrolytes or the acid-base equilibrium. The mean time (mt), counted in hours, of the filters and their standard deviation were analysed as statistical data by comparing the average values by means of the Fisher test.</p><p class="elsevierStylePara">Twelve patients took part in the study, 8 men (66%) and 4 women (33%), with APACHE II and SAPS scorings of 17 and 35, respectively, when admitted to hospital. Forty-eight filters were analysed, of which 28 (58.3%) corresponded to patients at a high risk of haemorrhage, with an mt of 21.8 ± 4.09 hours. Heparin was administered intravenously in 12 filters (25%) at an anticoagulant dose, with a filter mt of 17 ± 6.5 hours. Finally, in the 8 filters (16.6%) corresponding to the patients without any risk of haemorrhage, who were only administered subcutaneously a prophylactic dose of heparin against deep vein thrombosis, the mt was 16 ± 4.2 hours.</p><p class="elsevierStylePara">When comparing the average lifetime of the filters in patients without any risk of haemorrhage, there are no significant differences between those who were administered heparin intravenously at an anticoagulant dose and those who only received prophylactic heparin subcutaneously (p = 0.70). As expected, the mt of the filters in patients with coagulopathy is significantly greater than those administered intravenous heparin (p < 0.05) or those who received the prophylaxis dose (p < 0.01).</p><p class="elsevierStylePara">The ideal anticoagulant would prevent coagulation of the filters without causing haemorrhage, would have a short halflife with an action limited to the extracorporeal circuit and easy monitoring, secondary effects would not exist and it would provide an effective antagonist. None of the currently available anticoagulants can satisfy all these prerequisites. The most commonly used method to prevent coagulation of the system is the continuous administration of heparin in the proximal line of the extracorporeal circuit. Patients at risk have been recommended heparins of a low molecular weight, prostacyclins, regional heparinisation with protein neutralisation, recontrolgional anticoagulation with citrate, prostacyclins and the infusion of predilution saline solution.</p><p class="elsevierStylePara">To conclude, the replacement administered before the filter dilutes the filter¿s blood reduces haemoconcentration and improves rheological conditions. Its use is suitable when the platelet count is < 60,000/ml, the APTT is > 60 seconds or twice the control value, the INR is > 2 or when there is spontaneous haemorrhage or a disseminated intravascular coagulopathy. Recent studies show that critically ill patients at a high risk of haemorrhage, and undergoing these continuous therapies, can be treated without anticoagulation of the circuit, thus without altering the circuit¿s halflife.<span class="elsevierStyleSup">4,5</span> In our study, in which we used predilution replacement, we can confirm that the filters of the patients without any risk of haemorrhage have the same halflife whether or not they anticoagulate. These results need to be confirmed with studies of a greater sample size. </p>" "pdfFichero" => "P-E-S-A453-EN.pdf" "tienePdf" => true "bibliografia" => array:2 [ "titulo" => "Bibliography" "seccion" => array:1 [ 0 => array:1 [ "bibliografiaReferencia" => array:5 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Tolwani AJ, Wille KM. Anticoagulation for continuous renal replacement therapy. Semin Dial 2009;22:141-5. <a href="http://www.ncbi.nlm.nih.gov/pubmed/19426417" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 1 => array:3 [ "identificador" => "bib2" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Bouman CS, De Pont AC, Meijers JC, Bakhtiari K, Roem D, Zeerleder S, et al. The effects of continuous venovenous hemofiltration on coagulation activation. Crit Care 2006;10:R150." "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 2 => array:3 [ "identificador" => "bib3" "etiqueta" => "3" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Tank HR, Baldwin I, Bellomo R. Continuous veno-venous hemofiltration without anticoagulation in high-risk patients. Intens Care Med 2000;26:1652-7." "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 3 => array:3 [ "identificador" => "bib4" "etiqueta" => "4" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Morabito S, Guzzo I, Solazzo A, Muzi L, Luciani R, Pierucci A. Continuous renal replacement therapies: anticoagulation in the critically ill at high risk of bleeding. J Nephrol 2003;16:566-71. <a href="http://www.ncbi.nlm.nih.gov/pubmed/14696760" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 4 => array:3 [ "identificador" => "bib5" "etiqueta" => "5" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Oudemans-Van Straaten HM, Wester JP, De Pont AC, Schetz MR. Anticoagulation strategies in continuous renal replacement therapy: can the choice be evidence based? Intens Care Med 2006;32:188-202." "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] ] ] ] ] ] "idiomaDefecto" => "en" "url" => "/20132514/0000002900000006/v0_201502091611/X2013251409033642/v0_201502091612/en/main.assets" "Apartado" => array:4 [ "identificador" => "35436" "tipo" => "SECCION" "en" => array:2 [ "titulo" => "Letters to the Editor" "idiomaDefecto" => true ] "idiomaDefecto" => "en" ] "PDF" => "https://static.elsevier.es/multimedia/20132514/0000002900000006/v0_201502091611/X2013251409033642/v0_201502091612/en/P-E-S-A453-EN.pdf?idApp=UINPBA000064&text.app=https://revistanefrologia.com/" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/X2013251409033642?idApp=UINPBA000064" ]
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