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  • Title: BK virus nephropathy in renal transplant recipients in Kuwait: a preliminary report.
    Author: Nampoory MR, Johny KV, Pacsa A, Nair PM, Said T, Halim MA, Francis I, Samhan M, Mousawi M, Dalawi A, Szucs G, Al-Nakib W.
    Journal: Transplant Proc; 2005 Sep; 37(7):3048-50. PubMed ID: 16213300.
    Abstract:
    INTRODUCTION: BK virus nephropathy (BKVN) is a significant cause of graft loss among renal transplant recipients. The treatment outcomes of BKVN have been variably reported in the literature. PATIENTS AND METHODS: We prospectively investigated BKV infection and BKVN among a population of renal transplant recipients with suspected BKV infection. The 42 subjects who all had acute allograft dysfunction, were categorized in three groups: those with clinical, laboratory, and histological findings that did not suggest acute rejection, drug toxicity, or obstruction (group 1, n = 24); those with findings that suggested probable acute cellular rejection but did not respond to antirejection treatment (group 2, n = 10); and those whose renal histology suggested BKVN (group 3, n = 8). Polymerase chain reaction analysis was done to detect BKV DNA in urine and blood samples from each subject. BKV DNA was detected in 19 (45%) urine samples with 11 of these subjects (26.1% of total) having BK viremia as well. RESULTS: No evidence of BKVN was detected histologically in seven subjects with isolated BK viruria, while the others proved to be JC virus infections. Among the 11 subjects with BK viremia, eight had BKVN based on renal histology at the time of diagnosis with BKV infection, while the other three subsequently developed histological features of BKVN. BKVN developed after 5.3 +/- 2.5 (2 to 44) months after transplantation. The serum creatinine at time of BKVN diagnosis was 158.9 +/- 58 (87 to 285) micromol/L. All subjects were initially treated with a 50% reduction in immunosuppressive drug doses. Further decreases in immunosuppression were performed in all patients with close monitoring of renal function. All subjects were followed up for a of 18.2 +/- 5 (12 to 26) months. Two grafts were lost not due to BKVN, and one patient was lost to follow-up during this period. The latest serum creatinine in eight recipients is 113 + 20 (81 to 138) micromol/L, which is better than the renal function at diagnosis. CONCLUSION: The prevalence of BKVN in suspected BKV infection was 26%. Although the study period was short (30 months), BK viremia strongly correlated with BKVN, which seemed to be successfully treated with reduction in immunosuppression.
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