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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Chronic kidney disease &#40;CKD&#41; causes significant morbidity and mortality&#44; especially cardiovascular&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> Its severity is divided into stages from least to most severe<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a>&#59; stage 5 is the situation in which it becomes necessary to adopt a series of strategies of treatment including the initiating of renal replacement therapy which will not only keep the patients alive&#44; but also&#44; at least in part&#44; will maintain quality of life&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">As a general rule&#44; patients are initially included in a dialysis program&#44; either haemodialysis or peritoneal dialysis&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> Both treatments are effective to maintain the patient alive&#59; it requires prior surgical procedures&#44; either the placement of an arteriovenous fistula or insertion of a central venous or peritoneal catheter&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5</span></a> Moreover&#44; these replacement treatments are far from effectively compensating for all of the lost kidney functions&#44; therefore we only achieve partial treated hoping&#44; if there are no contraindications&#44; to apply definitive complete treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">At this time&#44; we have one effective and complete treatment for CKD&#46; Kidney transplant is the treatment of choice in most patients with end-stage CKD&#46;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">7&#44;8</span></a> Achieving adequate graft survival requires administering chronic pharmacological immunosuppression&#44; but this also promotes the occurrence of opportunistic infections<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> and the incidence of cancer increases&#46;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;11</span></a> Nevertheless&#44; it manages to restore the patient&#39;s previous health condition&#44; since the transplanted kidney fully replaces the functions lost by the native kidney&#44; therefore the benefit&#47;risk ratio is positive&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Generally&#44; deceased-donor kidney transplantation is considered when the patient is already on renal replacement therapy&#46; Dialysis is generally a necessary&#44; but not obligatory&#44; step before kidney transplantation in patients who are candidates for this procedure&#46; It is possible to have a kidney transplant without prior dialysis&#44; this is known as a pre-emptive&#44; or pre-dialysis kidney transplant&#58; a reality in recipients from living donors&#44;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a> although it remains conditional in the case of deceased donors due to the scarcity of organs&#46;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">7&#44;8&#44;13</span></a> In France&#44; pre-emptive deceased-donor kidney transplants have been incentivized in recent years&#44; with an increase from 5&#46;6&#37; to 15&#46;5&#37; between 2007 and 2014&#44; with good outcomes&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">In 2007&#44; our centre started a pre-emptive deceased-donor kidney transplant programme&#46; It should be noted that patients in a pre-dialysis situation only receive a transplant if there is no candidate for transplant in patient on renal replacement therapy&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">The objective of this study is to evaluate the results of our experience in pre-emptive&#44; deceased-donor kidney transplantation via a retrospective observational study with matched cohorts&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Materials and methods</span><p id="par0035" class="elsevierStylePara elsevierViewall">The design of the study was retrospective&#44; observational study with matched cohorts&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Recipients who received a kidney transplant from a brain dead donor at the Hospital General Universitario de Alicante &#91;Alicante General University Hospital&#93; between 2007 and 2016 were included&#46; Two groups were defined&#58; a pre-dialysis group &#40;pre-dialysis patients who received a pre-emptive&#44; deceased-donor transplant&#41; and a control group &#40;patients in renal replacement therapy who received a first transplant from a deceased donor&#41;&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">Inclusion criteria&#58; All patients in a pre-dialysis situation &#40;pre-dialysis group&#41; who received a kidney transplant between 2007 and 2016 were included and compared with a control group of transplant patients who were already on renal replacement therapy&#46; In the pre-dialysis group&#44; patients selected had a glomerular filtration rate under 15&#8239;ml&#47;min &#40;measured by CKD-EPI&#41;&#44; an estimated time to onset of dialysis under 6 months&#44; and a post-transplant time greater than one year&#46; Each case in the pre-dialysis group was matched by age and sex of donor and recipient&#44; as well as by transplant date &#40;to select the case for the control group&#44; the time between the two transplants must be less than 7 days&#41;&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">The immunological status of the recipients was evaluated via donor-recipient compatibility and the preformed antibody level&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The general immunosuppressant regime at the time of the kidney transplant consisted of tacrolimus &#40;initial dose&#58; Prograf&#174; 0&#46;1&#8239;mg&#47;kg every 12&#8239;h or Advagraf&#174; 0&#46;2&#8239;mg&#47;kg per day&#59; subsequent doses were adjusted to maintain a trough concentration of tacrolimus between 8 and 10&#8239;ng&#47;mL during the first month and afterwards between 6 and 8&#8239;ng&#47;mL&#41;&#44; mycophenolate mofetil &#40;500&#8239;mg&#47;12&#8239;h orally&#41; or mycophenolic acid &#40;360&#8239;mg&#47;12&#8239;h orally&#41;&#44; basiliximab or timoglobulin in high-risk patients and tapered corticosteroids&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">The variables evaluated were incidence of early graft loss &#40;before 48&#8239;h&#41;&#44; acute rejection &#40;sudden alteration in graft function or presence of delayed graft function&#44; with specific histological changes&#41;&#44; delayed graft function &#40;need for dialysis in the first week post-transplant&#41;&#44; kidney function at 12 and 36 months &#40;serum creatinine level&#41;&#44; and graft and patient survival during the same period&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">The period of time in the transplant waiting list in each patient group was evaluated&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Adherence to treatment was evaluated in both groups by determination of the variation in the trough tacrolimus concentration &#40;calculated as the mean of the coefficients of variation &#91;CV&#93; of the trough tacrolimus concentration for the individual patients obtained from month 3 through month 24 post-transplant&#44; expressed as a percentage&#41; along with a personal interview conducted at every visit&#46;<elsevierMultimedia ident="eq0005"></elsevierMultimedia></p><p id="par0075" class="elsevierStylePara elsevierViewall">The theoretical cost resulting from the care of the patients on dialysis of the control group patients was quantified using as the data source&#46;the study conducted by Arrieta et al&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> The cost per patient according to the corresponding time on dialysis was calculated &#40;months on dialysis multiplied by monthly cost depending on the technique&#41;&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Statistical study</span><p id="par0080" class="elsevierStylePara elsevierViewall">The continuous variables are expressed as the mean and 95&#37; confidence interval&#44; or median and interquartile range &#40;p25&#8211;p75&#41;&#44; depending on the distribution type&#46; The categorical variables are described as the number of percentage of patients by response category&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">The continuous variables were compared between groups with Student&#39;s T-test or Mann-Whitney&#39;s U test depending on the type of variable distribution&#46; Categorical variables were analysed using Fischer&#39;s test&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">A survival analysis &#40;Kaplan&#8211;Meier&#41; was performed to analyse the percentage of patients and grafts lost during the follow-up period&#46; Both groups were compared using the statistical test &#40;<span class="elsevierStyleItalic">log-rank</span>&#41;&#46; The level of significance was set at 0&#46;05&#46; The statistical analysis was performed with the SPSS software&#44; version 24&#46;</p></span></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Results</span><p id="par0095" class="elsevierStylePara elsevierViewall">Sixty-six &#40;66&#41; recipients were included in the pre-dialysis group&#44; matched with 66 patients in the control group&#44; 51 of them on haemodialysis and 15 on continuous outpatient peritoneal dialysis&#46; The median follow-up &#40;months&#41; in the pre-dialysis and control groups was 54&#46;0 &#40;p25&#8211;p75&#58; 24&#46;0&#8211;102&#46;0&#41; and 56 &#40;p25&#8211;p75&#58; 28&#46;8&#8211;108&#46;3&#41;&#44; respectively&#46; The time on the waiting list was similar in both groups &#40;median in months&#58; p25&#8211;p75&#59; 4 &#91;2&#8211;7&#93; vs&#46; 6 &#91;2&#8211;11&#93; months&#59; p&#8239;&#61;&#8239;0&#46;100&#41;&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">No significant differences were observed between the groups in the age and sex of the donor and recipient&#44; percentage of donors over 60 years&#44; cold ischaemia time&#44; and patients who received induction with thymoglobulin or basiliximab&#46; No significant differences were also observed in the blood group of the recipients or their immunization status&#46; The variability in the trough tacrolimus concentration was similar in both groups&#44; with no lack of adherence detected during the interviews&#46; <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a> shows the similarity of the variables in both groups&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0105" class="elsevierStylePara elsevierViewall">In the pre-dialysis group&#44; the incidence of delayed graft function was similar to the control group &#40;13&#46;6 vs&#46; 15&#46;2&#37;&#44; respectively&#59; p&#8239;&#61;&#8239;0&#46;804&#41;&#46; Similarly&#44; no statistically significant differences were found between the two groups for the presence of acute rejection &#40;pre-dialysis group&#58; 12&#46;1&#37; vs&#46; control group&#58; 12&#46;1&#37;&#59; p&#8239;&#61;&#8239;1&#46;000&#41; and early graft loss &#40;pre-dialysis group&#58; 4&#46;5&#37; vs&#46; control group 6&#37;&#59; p&#8239;&#61;&#8239;0&#46;890&#41;&#46; Kidney function&#44; evaluated by median serum creatinine&#44; was similar in the pre-dialysis and control groups at one year &#40;1&#46;5 vs&#46; 1&#46;5&#8239;mg&#47;dL&#44; respectively&#59; p&#8239;&#61;&#8239;0&#46;568&#41; and 3 years &#40;1&#46;5 vs&#46; 1&#46;4&#8239;mg&#47;dL&#59; p&#8239;&#61;&#8239;0&#46;808&#41; &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><p id="par0110" class="elsevierStylePara elsevierViewall">Recipient survival at one and 5 years was 98&#46;5&#37; and 88&#46;3&#37; in the pre-dialysis group and 95&#46;5&#37; and 83&#46;0&#37; in the control group&#44; respectively &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; Similarly&#44; graft survival in the pre-dialysis group was 87&#46;8&#37; at one year and 78&#46;2&#37; at 5 years&#44; and in the control group it was 89&#46;4&#37; at one year and 72&#46;5&#37; at 5 years &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0115" class="elsevierStylePara elsevierViewall">The mean recipient survival time was not different in the pre-dialysis and control groups &#40;126&#46;8 &#91;95&#37; CI&#58; 113&#46;8&#8211;139&#46;8&#93; vs&#46; 123&#46;1 &#91;95&#37; CI&#58; 109&#46;7&#8211;135&#46;5&#93;&#41; months&#44; respectively&#59; p&#8239;&#61;&#8239;0&#46;730&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; Nor were significant differences in the graft survival time observed between the two groups &#40;pre-dialysis group&#58; 114&#46;6 months &#91;95&#37; CI&#58; 99&#46;1&#8211;130&#46;2&#93; vs&#46; control group&#58; 109&#46;3 months &#91;95&#37; CI&#58; 93&#46;7&#8211;124&#46;8&#93;&#59; p&#8239;&#61;&#8239;0&#46;693&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">Taking into account the total time on peritoneal dialysis &#40;334 months&#41; and haemodialysis &#40;1834 months&#41;&#44; the total cost of renal replacement therapy in our patients was 8&#44;033&#44;893&#46;16 Euros&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Discussion</span><p id="par0125" class="elsevierStylePara elsevierViewall">The worldwide experience with pre-emptive&#44; deceased-donor kidney transplant is scarce and under debate&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> Some authors have reported that the time on dialysis before kidney transplantation has a negative impact on its outcome&#44; therefore performing it pre-emptively would be associated with greater graft and recipient survival as compared to patients who remained on dialysis for some time&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;6&#44;8&#44;16&#8211;18</span></a> Studies by Roake et al&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> and Papalois et al&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a> have demonstrated superior survival in pre-dialysis recipients&#46; These results were recently supported by a French multi-centre studied by Prezelin&#8211;Reydit in which it was concluded that pre-emptive transplant is associated with a lower risk of graft failure&#46; Nevertheless&#44; this conclusion may be conditional&#44; by having an older dialysis patient group with greater cardiovascular comorbidity and a higher percentage of diabetes mellitus patients than the pre-emptive transplant group&#44; and the fact that the grafts come from older donors&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> Other authors such as Luo et al&#46; recommend this type of transplant&#44; since they improve the patient&#39;s quality of life and reduce the economic cost&#44; despite not observing significant differences in terms of recipient or graft survival&#46; However&#44; these authors did show evidence of a decreased rate of acute rejection&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a></p><p id="par0130" class="elsevierStylePara elsevierViewall">In our study&#44; like in that by Luo et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> we did not find significant differences in recipient and graft survival rate&#46; Foucher et al&#46; reached the same conclusion in a recent study designed with a control group of more than 500 patients included in the waiting list for at least 6 months before their first dialysis session&#59; in addition&#44; they used an inverse probability score to make the groups mor homogeneous&#46; Nevertheless&#44; the dialysis group had a significantly higher percentage of hyperimmunised patients that were treated with more immunosuppression&#44; which could alter the results&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a></p><p id="par0135" class="elsevierStylePara elsevierViewall">The percentage of recipients who experienced acute rejection was similar in both groups&#44; which contrasts with the previously mentioned study by Luo et al&#46; and other studies cited in the literature&#44; which show that a longer time on dialysis increases the risk of rejection&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> The study by Cacciarelli&#44; with 325 kidney transplants&#44; concluded that the incidence of acute rejection was lower in patients who remained on dialysis for a period less than 6 months&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> In contrast&#44; it has been proposed that patients who have not experienced the symptoms of CKD or the morbidity associated with dialysis may be less compliant with the immunosuppressant treatment<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a>&#44; which would lead to a higher incidence of rejection&#46; It is worth to mention that in our group of recipients with pre-emptive transplant&#44; there was no evidence of no compliance in any patient&#44; a similar result was obtained by Papalois&#44; who did not find a higher rate of non-adherence to treatment in patients who received pre-emptive kidney transplant&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a></p><p id="par0140" class="elsevierStylePara elsevierViewall">Kidney function 12 and 36 months after the transplant was similar in both groups&#46; However&#44; in other studies&#44; it is made clear that the rate of delayed kidney function is higher in transplant patients who were already on dialysis<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a>&#59; the hypothesis proposed is a higher inflammatory status&#44; as well as an inadequate clearance of certain metabolites in these patients&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">Foucher et al&#46; exhaustively reviewed the ethical justification for transplanting patients in a pre-dialysis situation&#44; which could lead to a longer time on the waiting list for patients on dialysis&#46; In this study&#44; the recipients from the dialysis group were on the waiting list for a mean time of 38 months&#44; significantly longer &#40;p&#8239;&#60;&#8239;0&#46;0001&#41; than the pre-dialysis group&#44; with a mean time of 14 months&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> Our experience is different&#44; since the time on the waiting list in our patients is much shorter and it was not significantly different between the pre-dialysis and dialysis group&#58; 4 and 6 months&#44; respectively&#59; therefore it was consider that&#44; in our case&#44; performing a pre-emptive&#44; deceased-donor transplant does not constitute an ethical dilemma&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">The peculiarity of our work is based in the fact that in the analysis of the variables studied&#44; matching were made between pairs of recipients &#40;pre-dialysis situation vs&#46; recipients already on dialysis&#41; who were transplanted with a narrow time margin &#40;under 7 days&#41;&#59; whereas in the other referenced series&#44;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;16&#8211;18</span></a> the group of recipients in a pre-dialysis situation constituted a sub-group of their transplant populations&#44; without matching in terms of transplant time&#46;</p><p id="par0155" class="elsevierStylePara elsevierViewall">Regarding the economicl cost&#44; it is worth to mention that renal replacement therapy &#40;haemodialysis&#44; peritoneal dialysis&#44; and kidney transplant&#41; consume 2&#46;5&#37; of the National Health System&#39;s budget and more the 4&#37; of that for Specialised Care&#46; The mean cost of haemodialysis&#44; peritoneal dialysis&#44; and kidney transplant first year is 46&#44;660&#44; 32&#44;432&#44; and 47&#44;136 Euros per patient per year&#44; respectively&#46; However&#44; in subsequent years&#44; the cost of the kidney transplant decreases considerably&#58; 6477 Euros per patient per year&#59; transplant is the technique with the best cost-effectiveness ratio<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a>&#59; therefore we can affirm that it not only prolongs life&#44; but that as far as the economical cost it is also an more advantageous option as compared with long-term dialysis&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a> Thus&#44; the time on dialysis for the recipients in the control group entailed a cost which could have been reduced in the case of pre-emptive transplant&#59; this is an objective data point which should be added to the subjective benefit for the patient by avoiding dialysis and&#44; prior to this&#44; inserting the access points&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> However&#44; it is necessary to call attention to the limited availability of deceased-donor kidneys&#44;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">7&#44;8&#44;16</span></a> a fact which would significantly limit the implementation of the proposed strategy&#46;</p><p id="par0160" class="elsevierStylePara elsevierViewall">Deceased-donor kidney transplant offers patients in a pre-dialysis situation outcomes which are at least comparable to those of recipients on dialysis and prevents the morbidity&#44; mortality and psychological impact derived from dialysis&#44; in additional to being economically advantageous&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Conflict of interest</span><p id="par0165" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Introduction</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Currently&#44; kidney transplantation is the treatment of choice for patients with kidney disease who require replacement therapy&#46; Dialysis is a necessary step&#44; but not mandatory prior to transplantation&#46; There is the possibility of pre-emptive transplantation or transplantation in pre-dialysis&#44; that is&#44; without previous dialysis&#46; The aim of the present study is to evaluate the result of our experience with a pre-emptive kidney transplant from a deceased donor&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Materials and methods</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Retrospective&#44; observational&#44; matched cohort study&#46; We compared 66 pre-emptive with 66 non pre-emptive recipients&#44; who received a first renal graft performed at our centre&#44; matched by age and gender of donors and recipients&#44; time of transplant&#44; immunological risk&#44; immunosuppression and cold ischaemia time&#46;</p><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Early graft loss&#44; incidence of acute rejection&#44; delayed graft function&#44; renal function at 12 and 36 months and graft and recipient survival were assessed in this period&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">The percentage of recipients who presented early graft loss&#44; delayed graft function and acute rejection was similar in both groups&#46; No differences were observed in their renal function at 12 and 36 months after transplantation&#44; as well as the actuarial survival of patients &#40;p&#8239;&#61;&#8239;0&#46;801&#41; and grafts &#40;p&#8239;&#61;&#8239;0&#46;693&#41; in the studied period&#46; The total calculated cost of the period on dialysis for the control group was 8&#44;033&#44;893&#46;16 euros&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Pre-emptive transplantation can yield comparable outcomes to those for post-dialysis kidney transplantation&#44; and results in better quality of life for patients with end-stage kidney disease&#44; as well as a reduced cost&#46;</p></span>"
        "secciones" => array:4 [
          0 => array:2 [
            "identificador" => "abst0005"
            "titulo" => "Introduction"
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          1 => array:2 [
            "identificador" => "abst0010"
            "titulo" => "Materials and methods"
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          2 => array:2 [
            "identificador" => "abst0015"
            "titulo" => "Results"
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          3 => array:2 [
            "identificador" => "abst0020"
            "titulo" => "Conclusions"
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      "es" => array:3 [
        "titulo" => "Resumen"
        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Introducci&#243;n</span><p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">Actualmente&#44; el trasplante renal es el tratamiento de elecci&#243;n para pacientes con enfermedad renal que requieren terapia de sustituci&#243;n&#46; La di&#225;lisis es un paso necesario&#44; pero no obligatorio&#44; previo al trasplante&#46; Existe la posibilidad del trasplante renal anticipado o en pre-di&#225;lisis&#44; es decir&#44; sin di&#225;lisis previa&#46; El objetivo del presente estudio es evaluar el resultado de nuestra experiencia en el trasplante renal anticipado con donante cad&#225;ver&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Materiales y m&#233;todos</span><p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">Estudio observacional retrospectivo de tipo cohortes emparejadas&#46; Seincluy&#243; a 66 receptores de trasplante renal en situaci&#243;n pre-di&#225;lisis&#44; frente a un grupo control de 66 pacientes ya en di&#225;lisis que recibieron un primer injerto renal&#44; emparejados por edad y sexo de donante y receptor&#44; momento del trasplante&#44; riesgo inmunol&#243;gico&#44; inmunosupresi&#243;n y tiempo de isquemia fr&#237;a&#46; Se evalu&#243; la p&#233;rdida precoz del injerto&#44; incidencia de rechazo agudo&#44; funci&#243;n retrasada del injerto&#44; funci&#243;n renal a los 12 y 36 meses y supervivencia de injerto y receptor en ese periodo&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0065" class="elsevierStyleSimplePara elsevierViewall">El porcentaje de receptores que presentaron p&#233;rdida precoz del injerto&#44; funci&#243;n retrasada del injerto y rechazo agudo fue similar en ambos grupos&#46; Tampoco se observaron diferencias en la funci&#243;n renal a los 12 ni a los 36 meses despu&#233;s del trasplante&#44; ni en lasupervivencia actuarial de pacientes &#40;p&#8239;&#61;&#8239;0&#44;801&#41; e injertos &#40;p&#8239;&#61;&#8239;0&#44;693&#41;&#46;</p><p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">El coste total del tratamiento renal sustitutivo en el grupo control fue&#58; 8033893&#46;16 euros&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclusiones</span><p id="spar0075" class="elsevierStyleSimplePara elsevierViewall">El trasplante renal de donante cad&#225;ver ofrece a los pacientes en situaci&#243;n de predi&#225;lisis resultados superponibles a los de receptores en di&#225;lisis&#44; adem&#225;s de ser econ&#243;micamente rentable&#46;</p></span>"
        "secciones" => array:4 [
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            "identificador" => "abst0025"
            "titulo" => "Introducci&#243;n"
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          1 => array:2 [
            "identificador" => "abst0030"
            "titulo" => "Materiales y m&#233;todos"
          ]
          2 => array:2 [
            "identificador" => "abst0035"
            "titulo" => "Resultados"
          ]
          3 => array:2 [
            "identificador" => "abst0040"
            "titulo" => "Conclusiones"
          ]
        ]
      ]
    ]
    "NotaPie" => array:1 [
      0 => array:2 [
        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Franco A&#44; et al&#46; Una aproximaci&#243;n al trasplante renal anticipado de donante cad&#225;ver&#46; Estudio de cohortes emparejadas&#46; Nefrologia&#46; 2020&#59;40&#58;32&#8211;37&#46;</p>"
      ]
    ]
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        "etiqueta" => "Fig&#46; 1"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
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            "Alto" => 785
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        "detalles" => array:1 [
          0 => array:3 [
            "identificador" => "at0005"
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            "rol" => "short"
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        "descripcion" => array:1 [
          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Kidney transplant recipient survival in the pre-dialysis and control groups &#40;<span class="elsevierStyleItalic">log-rank</span>&#59; p&#8239;&#61;&#8239;0&#46;730&#41;&#46;</p>"
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      1 => array:8 [
        "identificador" => "fig0010"
        "etiqueta" => "Fig&#46; 2"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr2.jpeg"
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        "detalles" => array:1 [
          0 => array:3 [
            "identificador" => "at0010"
            "detalle" => "Fig&#46; "
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        "descripcion" => array:1 [
          "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Kidney transplant graft survival in the pre-dialysis and control groups &#40;<span class="elsevierStyleItalic">log-rank</span>&#59; p&#8239;&#61;&#8239;0&#46;693&#41;&#46;</p>"
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        "identificador" => "tbl0005"
        "etiqueta" => "Table 1"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
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        "detalles" => array:1 [
          0 => array:3 [
            "identificador" => "at0015"
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        "tabla" => array:2 [
          "leyenda" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Cp TAC&#58; trough tacrolimus concentration&#59; CV&#58; coefficient of variation&#59; HLA&#58; histocompatibility antigens&#59; 95&#37; CI&#58; 95&#37; confidence interval&#59; PRA&#58; panel-reactive antibody&#59; M&#47;F&#58; male&#47;female&#46;</p>"
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                  \t\t\t\t">52&#46;1 &#40;49&#46;1&#8211;55&#46;2&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Recipient age &#40;years&#41;&#44; mean &#40;</span>95&#37; <span class="elsevierStyleItalic">CI&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">65&#46;6&#47;36&#46;4&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t">62&#46;1&#47;37&#46;9&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">16&#46;7 &#40;15&#46;4&#8211;18&#46;0&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">16&#46;9 &#40;15&#46;9&#8211;17&#46;9&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">0&#46;394&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleItalic">Cp TAC Variability&#59; CV &#40;&#37;&#41;&#44; median &#40;p25-p75&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">24&#46;1 &#40;19&#46;5&#8211;33&#46;0&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">26&#46;1 &#40;19&#46;1&#8211;44&#46;1&#41;&nbsp;\t\t\t\t\t\t\n
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Original article
Pre-emptive deceased-donor kidney transplant: A matched cohort study
Una aproximación al trasplante renal anticipado de donantecadáver. Estudio de cohortes emparejadas
Antonio Francoa,
Corresponding author
franco_ant@gva.es

Corresponding author.
, Patricio Más-Serranob, Yussel Gonzáleza, Noelia Balibreaa, David Rodrígueza,b, María Isabel Lópeza, Francisco Javier Pérez Contrerasa
a Servicio de Nefrología, Hospital General Universitario de Alicante, Spain
b Servicio de Farmacia Hospitalaria, Hospital General Universitario de Alicante, Spain
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    "titulo" => "Pre-emptive deceased-donor kidney transplant&#58; A matched cohort study"
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        "titulo" => "Una aproximaci&#243;n al trasplante renal anticipado de donantecad&#225;ver&#46; Estudio de cohortes emparejadas"
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          "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Kidney transplant graft survival in the pre-dialysis and control groups &#40;<span class="elsevierStyleItalic">log-rank</span>&#59; p&#8239;&#61;&#8239;0&#46;693&#41;&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Chronic kidney disease &#40;CKD&#41; causes significant morbidity and mortality&#44; especially cardiovascular&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> Its severity is divided into stages from least to most severe<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a>&#59; stage 5 is the situation in which it becomes necessary to adopt a series of strategies of treatment including the initiating of renal replacement therapy which will not only keep the patients alive&#44; but also&#44; at least in part&#44; will maintain quality of life&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">As a general rule&#44; patients are initially included in a dialysis program&#44; either haemodialysis or peritoneal dialysis&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> Both treatments are effective to maintain the patient alive&#59; it requires prior surgical procedures&#44; either the placement of an arteriovenous fistula or insertion of a central venous or peritoneal catheter&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5</span></a> Moreover&#44; these replacement treatments are far from effectively compensating for all of the lost kidney functions&#44; therefore we only achieve partial treated hoping&#44; if there are no contraindications&#44; to apply definitive complete treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">At this time&#44; we have one effective and complete treatment for CKD&#46; Kidney transplant is the treatment of choice in most patients with end-stage CKD&#46;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">7&#44;8</span></a> Achieving adequate graft survival requires administering chronic pharmacological immunosuppression&#44; but this also promotes the occurrence of opportunistic infections<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> and the incidence of cancer increases&#46;<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">10&#44;11</span></a> Nevertheless&#44; it manages to restore the patient&#39;s previous health condition&#44; since the transplanted kidney fully replaces the functions lost by the native kidney&#44; therefore the benefit&#47;risk ratio is positive&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Generally&#44; deceased-donor kidney transplantation is considered when the patient is already on renal replacement therapy&#46; Dialysis is generally a necessary&#44; but not obligatory&#44; step before kidney transplantation in patients who are candidates for this procedure&#46; It is possible to have a kidney transplant without prior dialysis&#44; this is known as a pre-emptive&#44; or pre-dialysis kidney transplant&#58; a reality in recipients from living donors&#44;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a> although it remains conditional in the case of deceased donors due to the scarcity of organs&#46;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">7&#44;8&#44;13</span></a> In France&#44; pre-emptive deceased-donor kidney transplants have been incentivized in recent years&#44; with an increase from 5&#46;6&#37; to 15&#46;5&#37; between 2007 and 2014&#44; with good outcomes&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">In 2007&#44; our centre started a pre-emptive deceased-donor kidney transplant programme&#46; It should be noted that patients in a pre-dialysis situation only receive a transplant if there is no candidate for transplant in patient on renal replacement therapy&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">The objective of this study is to evaluate the results of our experience in pre-emptive&#44; deceased-donor kidney transplantation via a retrospective observational study with matched cohorts&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Materials and methods</span><p id="par0035" class="elsevierStylePara elsevierViewall">The design of the study was retrospective&#44; observational study with matched cohorts&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Recipients who received a kidney transplant from a brain dead donor at the Hospital General Universitario de Alicante &#91;Alicante General University Hospital&#93; between 2007 and 2016 were included&#46; Two groups were defined&#58; a pre-dialysis group &#40;pre-dialysis patients who received a pre-emptive&#44; deceased-donor transplant&#41; and a control group &#40;patients in renal replacement therapy who received a first transplant from a deceased donor&#41;&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">Inclusion criteria&#58; All patients in a pre-dialysis situation &#40;pre-dialysis group&#41; who received a kidney transplant between 2007 and 2016 were included and compared with a control group of transplant patients who were already on renal replacement therapy&#46; In the pre-dialysis group&#44; patients selected had a glomerular filtration rate under 15&#8239;ml&#47;min &#40;measured by CKD-EPI&#41;&#44; an estimated time to onset of dialysis under 6 months&#44; and a post-transplant time greater than one year&#46; Each case in the pre-dialysis group was matched by age and sex of donor and recipient&#44; as well as by transplant date &#40;to select the case for the control group&#44; the time between the two transplants must be less than 7 days&#41;&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">The immunological status of the recipients was evaluated via donor-recipient compatibility and the preformed antibody level&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">The general immunosuppressant regime at the time of the kidney transplant consisted of tacrolimus &#40;initial dose&#58; Prograf&#174; 0&#46;1&#8239;mg&#47;kg every 12&#8239;h or Advagraf&#174; 0&#46;2&#8239;mg&#47;kg per day&#59; subsequent doses were adjusted to maintain a trough concentration of tacrolimus between 8 and 10&#8239;ng&#47;mL during the first month and afterwards between 6 and 8&#8239;ng&#47;mL&#41;&#44; mycophenolate mofetil &#40;500&#8239;mg&#47;12&#8239;h orally&#41; or mycophenolic acid &#40;360&#8239;mg&#47;12&#8239;h orally&#41;&#44; basiliximab or timoglobulin in high-risk patients and tapered corticosteroids&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">The variables evaluated were incidence of early graft loss &#40;before 48&#8239;h&#41;&#44; acute rejection &#40;sudden alteration in graft function or presence of delayed graft function&#44; with specific histological changes&#41;&#44; delayed graft function &#40;need for dialysis in the first week post-transplant&#41;&#44; kidney function at 12 and 36 months &#40;serum creatinine level&#41;&#44; and graft and patient survival during the same period&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">The period of time in the transplant waiting list in each patient group was evaluated&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Adherence to treatment was evaluated in both groups by determination of the variation in the trough tacrolimus concentration &#40;calculated as the mean of the coefficients of variation &#91;CV&#93; of the trough tacrolimus concentration for the individual patients obtained from month 3 through month 24 post-transplant&#44; expressed as a percentage&#41; along with a personal interview conducted at every visit&#46;<elsevierMultimedia ident="eq0005"></elsevierMultimedia></p><p id="par0075" class="elsevierStylePara elsevierViewall">The theoretical cost resulting from the care of the patients on dialysis of the control group patients was quantified using as the data source&#46;the study conducted by Arrieta et al&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> The cost per patient according to the corresponding time on dialysis was calculated &#40;months on dialysis multiplied by monthly cost depending on the technique&#41;&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Statistical study</span><p id="par0080" class="elsevierStylePara elsevierViewall">The continuous variables are expressed as the mean and 95&#37; confidence interval&#44; or median and interquartile range &#40;p25&#8211;p75&#41;&#44; depending on the distribution type&#46; The categorical variables are described as the number of percentage of patients by response category&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">The continuous variables were compared between groups with Student&#39;s T-test or Mann-Whitney&#39;s U test depending on the type of variable distribution&#46; Categorical variables were analysed using Fischer&#39;s test&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">A survival analysis &#40;Kaplan&#8211;Meier&#41; was performed to analyse the percentage of patients and grafts lost during the follow-up period&#46; Both groups were compared using the statistical test &#40;<span class="elsevierStyleItalic">log-rank</span>&#41;&#46; The level of significance was set at 0&#46;05&#46; The statistical analysis was performed with the SPSS software&#44; version 24&#46;</p></span></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Results</span><p id="par0095" class="elsevierStylePara elsevierViewall">Sixty-six &#40;66&#41; recipients were included in the pre-dialysis group&#44; matched with 66 patients in the control group&#44; 51 of them on haemodialysis and 15 on continuous outpatient peritoneal dialysis&#46; The median follow-up &#40;months&#41; in the pre-dialysis and control groups was 54&#46;0 &#40;p25&#8211;p75&#58; 24&#46;0&#8211;102&#46;0&#41; and 56 &#40;p25&#8211;p75&#58; 28&#46;8&#8211;108&#46;3&#41;&#44; respectively&#46; The time on the waiting list was similar in both groups &#40;median in months&#58; p25&#8211;p75&#59; 4 &#91;2&#8211;7&#93; vs&#46; 6 &#91;2&#8211;11&#93; months&#59; p&#8239;&#61;&#8239;0&#46;100&#41;&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">No significant differences were observed between the groups in the age and sex of the donor and recipient&#44; percentage of donors over 60 years&#44; cold ischaemia time&#44; and patients who received induction with thymoglobulin or basiliximab&#46; No significant differences were also observed in the blood group of the recipients or their immunization status&#46; The variability in the trough tacrolimus concentration was similar in both groups&#44; with no lack of adherence detected during the interviews&#46; <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a> shows the similarity of the variables in both groups&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0105" class="elsevierStylePara elsevierViewall">In the pre-dialysis group&#44; the incidence of delayed graft function was similar to the control group &#40;13&#46;6 vs&#46; 15&#46;2&#37;&#44; respectively&#59; p&#8239;&#61;&#8239;0&#46;804&#41;&#46; Similarly&#44; no statistically significant differences were found between the two groups for the presence of acute rejection &#40;pre-dialysis group&#58; 12&#46;1&#37; vs&#46; control group&#58; 12&#46;1&#37;&#59; p&#8239;&#61;&#8239;1&#46;000&#41; and early graft loss &#40;pre-dialysis group&#58; 4&#46;5&#37; vs&#46; control group 6&#37;&#59; p&#8239;&#61;&#8239;0&#46;890&#41;&#46; Kidney function&#44; evaluated by median serum creatinine&#44; was similar in the pre-dialysis and control groups at one year &#40;1&#46;5 vs&#46; 1&#46;5&#8239;mg&#47;dL&#44; respectively&#59; p&#8239;&#61;&#8239;0&#46;568&#41; and 3 years &#40;1&#46;5 vs&#46; 1&#46;4&#8239;mg&#47;dL&#59; p&#8239;&#61;&#8239;0&#46;808&#41; &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><p id="par0110" class="elsevierStylePara elsevierViewall">Recipient survival at one and 5 years was 98&#46;5&#37; and 88&#46;3&#37; in the pre-dialysis group and 95&#46;5&#37; and 83&#46;0&#37; in the control group&#44; respectively &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; Similarly&#44; graft survival in the pre-dialysis group was 87&#46;8&#37; at one year and 78&#46;2&#37; at 5 years&#44; and in the control group it was 89&#46;4&#37; at one year and 72&#46;5&#37; at 5 years &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0115" class="elsevierStylePara elsevierViewall">The mean recipient survival time was not different in the pre-dialysis and control groups &#40;126&#46;8 &#91;95&#37; CI&#58; 113&#46;8&#8211;139&#46;8&#93; vs&#46; 123&#46;1 &#91;95&#37; CI&#58; 109&#46;7&#8211;135&#46;5&#93;&#41; months&#44; respectively&#59; p&#8239;&#61;&#8239;0&#46;730&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; Nor were significant differences in the graft survival time observed between the two groups &#40;pre-dialysis group&#58; 114&#46;6 months &#91;95&#37; CI&#58; 99&#46;1&#8211;130&#46;2&#93; vs&#46; control group&#58; 109&#46;3 months &#91;95&#37; CI&#58; 93&#46;7&#8211;124&#46;8&#93;&#59; p&#8239;&#61;&#8239;0&#46;693&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">Taking into account the total time on peritoneal dialysis &#40;334 months&#41; and haemodialysis &#40;1834 months&#41;&#44; the total cost of renal replacement therapy in our patients was 8&#44;033&#44;893&#46;16 Euros&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Discussion</span><p id="par0125" class="elsevierStylePara elsevierViewall">The worldwide experience with pre-emptive&#44; deceased-donor kidney transplant is scarce and under debate&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> Some authors have reported that the time on dialysis before kidney transplantation has a negative impact on its outcome&#44; therefore performing it pre-emptively would be associated with greater graft and recipient survival as compared to patients who remained on dialysis for some time&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;6&#44;8&#44;16&#8211;18</span></a> Studies by Roake et al&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> and Papalois et al&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a> have demonstrated superior survival in pre-dialysis recipients&#46; These results were recently supported by a French multi-centre studied by Prezelin&#8211;Reydit in which it was concluded that pre-emptive transplant is associated with a lower risk of graft failure&#46; Nevertheless&#44; this conclusion may be conditional&#44; by having an older dialysis patient group with greater cardiovascular comorbidity and a higher percentage of diabetes mellitus patients than the pre-emptive transplant group&#44; and the fact that the grafts come from older donors&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">19</span></a> Other authors such as Luo et al&#46; recommend this type of transplant&#44; since they improve the patient&#39;s quality of life and reduce the economic cost&#44; despite not observing significant differences in terms of recipient or graft survival&#46; However&#44; these authors did show evidence of a decreased rate of acute rejection&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a></p><p id="par0130" class="elsevierStylePara elsevierViewall">In our study&#44; like in that by Luo et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> we did not find significant differences in recipient and graft survival rate&#46; Foucher et al&#46; reached the same conclusion in a recent study designed with a control group of more than 500 patients included in the waiting list for at least 6 months before their first dialysis session&#59; in addition&#44; they used an inverse probability score to make the groups mor homogeneous&#46; Nevertheless&#44; the dialysis group had a significantly higher percentage of hyperimmunised patients that were treated with more immunosuppression&#44; which could alter the results&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a></p><p id="par0135" class="elsevierStylePara elsevierViewall">The percentage of recipients who experienced acute rejection was similar in both groups&#44; which contrasts with the previously mentioned study by Luo et al&#46; and other studies cited in the literature&#44; which show that a longer time on dialysis increases the risk of rejection&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> The study by Cacciarelli&#44; with 325 kidney transplants&#44; concluded that the incidence of acute rejection was lower in patients who remained on dialysis for a period less than 6 months&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> In contrast&#44; it has been proposed that patients who have not experienced the symptoms of CKD or the morbidity associated with dialysis may be less compliant with the immunosuppressant treatment<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a>&#44; which would lead to a higher incidence of rejection&#46; It is worth to mention that in our group of recipients with pre-emptive transplant&#44; there was no evidence of no compliance in any patient&#44; a similar result was obtained by Papalois&#44; who did not find a higher rate of non-adherence to treatment in patients who received pre-emptive kidney transplant&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a></p><p id="par0140" class="elsevierStylePara elsevierViewall">Kidney function 12 and 36 months after the transplant was similar in both groups&#46; However&#44; in other studies&#44; it is made clear that the rate of delayed kidney function is higher in transplant patients who were already on dialysis<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a>&#59; the hypothesis proposed is a higher inflammatory status&#44; as well as an inadequate clearance of certain metabolites in these patients&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">Foucher et al&#46; exhaustively reviewed the ethical justification for transplanting patients in a pre-dialysis situation&#44; which could lead to a longer time on the waiting list for patients on dialysis&#46; In this study&#44; the recipients from the dialysis group were on the waiting list for a mean time of 38 months&#44; significantly longer &#40;p&#8239;&#60;&#8239;0&#46;0001&#41; than the pre-dialysis group&#44; with a mean time of 14 months&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> Our experience is different&#44; since the time on the waiting list in our patients is much shorter and it was not significantly different between the pre-dialysis and dialysis group&#58; 4 and 6 months&#44; respectively&#59; therefore it was consider that&#44; in our case&#44; performing a pre-emptive&#44; deceased-donor transplant does not constitute an ethical dilemma&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">The peculiarity of our work is based in the fact that in the analysis of the variables studied&#44; matching were made between pairs of recipients &#40;pre-dialysis situation vs&#46; recipients already on dialysis&#41; who were transplanted with a narrow time margin &#40;under 7 days&#41;&#59; whereas in the other referenced series&#44;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;16&#8211;18</span></a> the group of recipients in a pre-dialysis situation constituted a sub-group of their transplant populations&#44; without matching in terms of transplant time&#46;</p><p id="par0155" class="elsevierStylePara elsevierViewall">Regarding the economicl cost&#44; it is worth to mention that renal replacement therapy &#40;haemodialysis&#44; peritoneal dialysis&#44; and kidney transplant&#41; consume 2&#46;5&#37; of the National Health System&#39;s budget and more the 4&#37; of that for Specialised Care&#46; The mean cost of haemodialysis&#44; peritoneal dialysis&#44; and kidney transplant first year is 46&#44;660&#44; 32&#44;432&#44; and 47&#44;136 Euros per patient per year&#44; respectively&#46; However&#44; in subsequent years&#44; the cost of the kidney transplant decreases considerably&#58; 6477 Euros per patient per year&#59; transplant is the technique with the best cost-effectiveness ratio<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a>&#59; therefore we can affirm that it not only prolongs life&#44; but that as far as the economical cost it is also an more advantageous option as compared with long-term dialysis&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a> Thus&#44; the time on dialysis for the recipients in the control group entailed a cost which could have been reduced in the case of pre-emptive transplant&#59; this is an objective data point which should be added to the subjective benefit for the patient by avoiding dialysis and&#44; prior to this&#44; inserting the access points&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> However&#44; it is necessary to call attention to the limited availability of deceased-donor kidneys&#44;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">7&#44;8&#44;16</span></a> a fact which would significantly limit the implementation of the proposed strategy&#46;</p><p id="par0160" class="elsevierStylePara elsevierViewall">Deceased-donor kidney transplant offers patients in a pre-dialysis situation outcomes which are at least comparable to those of recipients on dialysis and prevents the morbidity&#44; mortality and psychological impact derived from dialysis&#44; in additional to being economically advantageous&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Conflict of interest</span><p id="par0165" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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            0 => "Pre-emptive renal transplant"
            1 => "Deceased donor"
            2 => "Patient and graft survival"
            3 => "Dialysis"
            4 => "Psychological aspects"
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          "palabras" => array:5 [
            0 => "Trasplante renal anticipado"
            1 => "Donante cad&#225;ver"
            2 => "Supervivencia injerto y receptor"
            3 => "Di&#225;lisis"
            4 => "Impacto psicol&#243;gico"
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Introduction</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Currently&#44; kidney transplantation is the treatment of choice for patients with kidney disease who require replacement therapy&#46; Dialysis is a necessary step&#44; but not mandatory prior to transplantation&#46; There is the possibility of pre-emptive transplantation or transplantation in pre-dialysis&#44; that is&#44; without previous dialysis&#46; The aim of the present study is to evaluate the result of our experience with a pre-emptive kidney transplant from a deceased donor&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Materials and methods</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Retrospective&#44; observational&#44; matched cohort study&#46; We compared 66 pre-emptive with 66 non pre-emptive recipients&#44; who received a first renal graft performed at our centre&#44; matched by age and gender of donors and recipients&#44; time of transplant&#44; immunological risk&#44; immunosuppression and cold ischaemia time&#46;</p><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Early graft loss&#44; incidence of acute rejection&#44; delayed graft function&#44; renal function at 12 and 36 months and graft and recipient survival were assessed in this period&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">The percentage of recipients who presented early graft loss&#44; delayed graft function and acute rejection was similar in both groups&#46; No differences were observed in their renal function at 12 and 36 months after transplantation&#44; as well as the actuarial survival of patients &#40;p&#8239;&#61;&#8239;0&#46;801&#41; and grafts &#40;p&#8239;&#61;&#8239;0&#46;693&#41; in the studied period&#46; The total calculated cost of the period on dialysis for the control group was 8&#44;033&#44;893&#46;16 euros&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Pre-emptive transplantation can yield comparable outcomes to those for post-dialysis kidney transplantation&#44; and results in better quality of life for patients with end-stage kidney disease&#44; as well as a reduced cost&#46;</p></span>"
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            "titulo" => "Introduction"
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            "identificador" => "abst0010"
            "titulo" => "Materials and methods"
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        "titulo" => "Resumen"
        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Introducci&#243;n</span><p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">Actualmente&#44; el trasplante renal es el tratamiento de elecci&#243;n para pacientes con enfermedad renal que requieren terapia de sustituci&#243;n&#46; La di&#225;lisis es un paso necesario&#44; pero no obligatorio&#44; previo al trasplante&#46; Existe la posibilidad del trasplante renal anticipado o en pre-di&#225;lisis&#44; es decir&#44; sin di&#225;lisis previa&#46; El objetivo del presente estudio es evaluar el resultado de nuestra experiencia en el trasplante renal anticipado con donante cad&#225;ver&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Materiales y m&#233;todos</span><p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">Estudio observacional retrospectivo de tipo cohortes emparejadas&#46; Seincluy&#243; a 66 receptores de trasplante renal en situaci&#243;n pre-di&#225;lisis&#44; frente a un grupo control de 66 pacientes ya en di&#225;lisis que recibieron un primer injerto renal&#44; emparejados por edad y sexo de donante y receptor&#44; momento del trasplante&#44; riesgo inmunol&#243;gico&#44; inmunosupresi&#243;n y tiempo de isquemia fr&#237;a&#46; Se evalu&#243; la p&#233;rdida precoz del injerto&#44; incidencia de rechazo agudo&#44; funci&#243;n retrasada del injerto&#44; funci&#243;n renal a los 12 y 36 meses y supervivencia de injerto y receptor en ese periodo&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0065" class="elsevierStyleSimplePara elsevierViewall">El porcentaje de receptores que presentaron p&#233;rdida precoz del injerto&#44; funci&#243;n retrasada del injerto y rechazo agudo fue similar en ambos grupos&#46; Tampoco se observaron diferencias en la funci&#243;n renal a los 12 ni a los 36 meses despu&#233;s del trasplante&#44; ni en lasupervivencia actuarial de pacientes &#40;p&#8239;&#61;&#8239;0&#44;801&#41; e injertos &#40;p&#8239;&#61;&#8239;0&#44;693&#41;&#46;</p><p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">El coste total del tratamiento renal sustitutivo en el grupo control fue&#58; 8033893&#46;16 euros&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclusiones</span><p id="spar0075" class="elsevierStyleSimplePara elsevierViewall">El trasplante renal de donante cad&#225;ver ofrece a los pacientes en situaci&#243;n de predi&#225;lisis resultados superponibles a los de receptores en di&#225;lisis&#44; adem&#225;s de ser econ&#243;micamente rentable&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Franco A&#44; et al&#46; Una aproximaci&#243;n al trasplante renal anticipado de donante cad&#225;ver&#46; Estudio de cohortes emparejadas&#46; Nefrologia&#46; 2020&#59;40&#58;32&#8211;37&#46;</p>"
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