Percent of Failed Kidney Transplants That Attempt Again

Groundwork/Aims: Patients with a failed kidney transplant represent a unique, high-risk chronic kidney disease population that is increasing in number, and may be sub-optimally managed. Our aim was to compare the survival of patients with failed allografts to patients with native kidney failure and to assess whether their survival is afflicted past the graft resection. Methods: Kaplan-Meier and Cox-regression survival analyses were performed on the data of 57 patients with graft failure and of 123 transplant-naive haemodialysed patients. Results: After adjustment for historic period and gender, at that place was no statistically significant divergence in the mortality of patients in the two groups. The 43 patients, who had a transplanted kidney nephrectomy had a statistically not significant survival do good over non-nephrectomised patients (age and gender adapted gamble ratio: 0.56 95 % conviction interval: 0.24-1.58, p-value: 0.18). Decision: Elective graft resection is a safe, effective alternative for both the handling and the prevention of the chronic inflammatory land associated with a failed kidney transplant.

© 2013 S. Karger AG, Basel

Introduction

Patients with a failed kidney transplant represent a unique chronic kidney disease (CKD) population that is increasing in number, and that is at high hazard of morbidity and mortality because of a prolonged history of CKD that may be sub-optimally managed [1]. A number of contempo studies have shown that the mortality rate in this population is higher than among age-matched incident dialysis patients, patients listed for primary transplantation, and patients with a functioning transplant [ii]. Five former cohorts did not find a significant difference in bloodshed between patients starting dialysis with graft failure (GF) and transplant naive patients on dialysis handling (HD) [3,4,5,6,7,8]. There is no articulate indication about the optimal timing for starting dialysis after graft failure. We can merely rely on the indications available for the general population of patients with CKDs (G/DOQI recommendations), based on clinical symptoms and biochemical changes. In fact, many reports on patients with renal allograft failure tell u.s.a. that dialysis frequently started at GFR levels far below the optimal suggested threshold [nine,10,11]. Evidence regarding the effect of transplanted kidney nephrectomy is controversial. Bloodshed associated with graft resection ranges from 0 to 39% [12]. Lopez-Gomez et al. ended that maintaining a failed graft represents a chronic inflammatory land, independently from the presence or absenteeism of any overt symptom [13]. A more recent paper using the USRD registry found that transplanted kidney nephrectomised patients had a consequent survival advantage over non-nephrectomised patients (bloodshed rate ratio: 0.89) if the graft survival was longer than 1 year [14]. Goldfarb-Rumyantzev et al. found that preemptive re-transplantation increases the risk of graft failure and has no effect on recipient survival [15]. Another argument raised against graft resection has been the observation that graft removals may exist followed by a rising in anti-HLA antibodies, which may accept a negative event on the subsequent transplantations [16]. Transplanted kidney nephrectomy has long been indicated in hyperacute rejection or in example of technical complications of transplant surgery, though the role of allograft nephrectomy outside these indications has been controversial. Routine nephrectomy of failed allografts has been practiced, every bit well as leaving asymptomatic grafts in situ and continuing immunosuppression. The purported benefits of leaving grafts in situ are erythropoietin production by the failed allograft and retentivity of residual renal function, though there is no evidence to support such a benefit, rather about increased mortality following allograft loss [17,18,xix]. The return to haemodialysis has been demonstrated to lead to deep depression that is oftentimes undervalued past nephrologists, and the opportunity for pscyhiatric help is seldom offered to these patients [xx].

In our study we compared the characteristics and survival of patients with graft failure readmitted to dialysis (reHD group) to transplant-naive dialysed patients (HD grouping) and assessed whether their survival was affected past the removal of the failed graft.

Materials and Methods

Choice and Clarification of Participants

Demographic data were collected on all patients retrospectively by nautical chart review at baseline. We enrolled 180 patients who started dialysis between 2000-2005, of whom 123 had had no kidney transplantation previously, 12% were waiting-listed for transplantation and 57 were transplanted patients with graft failure (twenty of them (35%) were waiting-listed again). In Hungary the proportion of waiting-listed patients is rather low That derives not only from inadequate patient educational activity but as well from the depression activity for deceased donor kidney transplants.

Transplanted patients received a cadaver kidney between 1991 and 2002 in the Center of Transplantation, Medical & Health Science Centre, University of Debrecen. Recipients who received organs other than kidneys, and patients younger than 18 years were excluded from the study. Laboratory data obtained at baseline included the following: hemoglobin levels (Hb), GFR, calcium (Ca), phosphate (P), cholesterol (chol), triglycerides (Tg). Follow-upward data were obtained annually from the general practitioners of the patients and besides from the dialysis centres of the 4 Hungarian counties where the patients lived. They were followed till decease or till 15 December 2010.

Resected kidney transplant specimens were routinely sent to the pathology section for microscopic exam. Specimens were subjected to standard histologic review by a staff pathologist using routine techniques [21].

Nosotros used Kaplan-Meier analysis and log-rank test to compare the survival of patients in the HD and in the reHD groups from the start of the dialysis. We adjusted for age and gender in Cox-regression. Nosotros performed a like assay to compare the survival of patients with graft failure whose graft was removed (43 patients) and those whose graft was non removed (xiv patients). Additionally, we compared the clinical characteristics of patients in the HD and reHD groups. We used the 2-sample t-test to compare continuous and the χ²-test to compare chiselled variables.

Results

The comparison of the HD and the reHD groups revealed several differences. Patients in the reHD group had lower haemoglobin level and higher GFR (Tabular array 1). The proportion of patients taking statins was larger in the HD group. Patients in the HD grouping were significantly older. In the crude analysis patients in the reHD group had a much amend survival (hazard ratio 0.51, 95% CI: 0.33-0.59) (Figure 1). Notwithstanding, after aligning for age and gender there was no difference in the survival probability of the two groups (hazard ratio reHD versus HD group: 1.09, 95% CI: 0.64-ane.87) (Figure 1). The characteristics of the reHD grouping are presented in Tabular array ii. Non-compliance in the table ways that the patients did non have control visits in the transplantation centre or at their general practitioners, or stopped taking their immunosuppressive drugs that led to rejection. Two patients committed suicide in the non-graftectomised group. In 43 patients transplanted kidney nephrectomy was performed within 1 year (average: 262 days) later restarting Hard disk. Death within 1-year after readmission to dialysis was 6.97% in the graftectomised and 21.42 % in non-graftectomised group. The indications of the graft nephrectomy were the followings: astute rejection or severe inflammation (in 17 cases), symptoms or signs of severe anaemia (in 12 cases), constituent nephrectomies without major symptoms (diuresis less than 500 ml/twenty-four hour period) (in fourteen cases). Nephrectomised patients had a consistent but statistically not significant survival advantage (crude hazard ratio = 0.50 95 % confidence interval: 0.22-one.12, p=0.09; afterwards adjustment for historic period and gender hazard ratio: 0.56, 95 % CI: 0.24-ane.32, p=0.eighteen). Of the reHD patients 34.8 % were re-transplanted, although none of them had preemptive re-transplant.

Table one

Baseline characteristics of patients in the HD and in the re-HD groups

Table 2

Characteristics of and events in the re-HD group

Fig. 1

Survival of patients with graft failure readmitted to dialysis (re-HD group) compared to transplant-naive patients (HD patients); A: crude assay; B: afterward aligning for age and gender.

Our clinical policy for tapering immune suppressive therapy after render to dialysis was the following: (1) antiproliferative drugs (azathioprine, mycophenolate-mofetil, sirolimus) should be the outset drugs to be discontinued when irreversible graft failure is established, (2) tapering and withdrawal of calcineurin inhibitor over a brief period (i-three weeks) of the graft failure followed a chronic and slow progression, and a longer menstruum (four-8 weeks) if the graft failure followed more acute immunologic events, (3) slow tapering of steroids with possible withdrawal (in a few months) maintaining the aforementioned dose of steroid for 1 month, and so halving the steroid dose in every month until complete withdrawal.

Histologic exam of the resected kidney transplants was available for 37 of the 43 cases. In all 37 cases, there was evidence of chronic rejection characterized by the existence if variable degrees of glomerulitis and tubulitis. Characteristic findings included presence of chronic interstitial mononuclear prison cell infiltirate (ane), subendothelial lymphocytic and monocytic cellular infiltrate (ii), intimal vascular fibrosis (three), moderate to severe interstitial fibrosis (4). None of the specimens had viral inclusions or findings suggestive of an infection. A summary of the major histologic findings is provided in Tabular array 3.

Tabular array 3

Summary of the histopathological findings in 37 resected kidney transplant specimens

Word

The first important finding of our study was that after adjustment for historic period and gender, patients with graft failure readmitted to dialysis and transplant-naive dialysed patients had similar survival. Our observation is in line with the findings of former cohorts studying this question [3,iv,5,six,seven,viii].

With a larger numbers of patients entering long-term dialysis afterwards failed kidney transplant worldwide, optimal direction of the failed allograft is an increasingly of import question. There is not a consensus about the optimal management of the failed renal allograft. Our 2d important finding is that removal of the failed kidney transplant provided a non significant survival benefit. That outcome is in agreement with observations made by Ayus et al. They have demonstrated that surgical removal of the failed allograft and discontinuation of immunosuppressant medications may amend survival post-obit a failed renal allograft [22].

Some caution needs to be taken when our results are interpreted. Firstly, our sample size was not large plenty to accept a precise judge of the risk ratio comparing the bloodshed of transplant-naive dialysed patients and of patients readmitted to dialysis. Although our data did not provide statistical evidence for the deviation in the survival probability, it cannot exclude even a reasonably large difference. Secondly, misreckoning by indication may partially explicate the survival do good of graftectomy. Thirdly, removal of the failed allograft may limit opportunities for echo transplantation by increasing cytotoxic antibody levels, and may be associated with an increased risk of echo transplant failure [1]. Withal, other investigators accept non reported an increase in antihuman leukocyte antigen (anti-HLA) antibodies after nephrectomy [16,23]. Elective transplanted kidney nephrectomy, in the easily of the proper surgical team is a safe, an constructive culling for the treatment of the chronic inflammatory state associated with a failed kidney transplant. Nosotros should emphasise that all patients who return to HD following kidney allograft loss should be screened for evidence of chronic inflammation. This should include cess of erythropoietin resistance, hypoalbuminaemia, and elevated ferritin and CRP levels. Patients with a failed graft correspond a challenging clinical problem. Optimal timing of the first of the dialysis afterwards graft loss and fugitive an underdiagnosed uraemic state might reduce morbidity and bloodshed [24]. Appropriate direction of CKD-related complications, including treatment of metabolic os affliction, management of hyperkalemia, acidosis, and anemia, is another of import component of CKD intendance. The risk of complications related to the retained allograft may be higher in patients with shorter durations of allograft role, peculiarly those with graft survival of less than 1 year, those with cytotoxic antibodies prior to the primary transplant, those with a history of rejection or rejection equally the cause of transplant failure, and those with an HLA-mismatched principal transplant. Information technology may be also helpful to make up one's mind the cytotoxic antibody level at the fourth dimension of transplant failure to inform decision-making regarding immunosuppressant drug withdrawal subsequently transplant failure [1].

Conclusion

In summary, the patient with a failed graft enters no-man's-land where all of the physicians (transplant nephrologists, transplant surgeons, dialysis nephrologists) should be involved in the management. A consensus betwixt the transplant team and the dialysis squad is crucial to make up one's mind which treatment is the most constructive in reducing long-term bloodshed in this high risk population in the dialysis clinic.

Disharmonize of Interests

The authors of this manuscript state that they have no conflicts to declare.

Acknowledgements

We thank the transplantation team of the Institute of Surgery, Center of Transplantation, Faculty of Medicine, Medical & Health Sciences Centre, University of Debrecen for their collaboration.

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