The Effects of Body Mass Index on Graft Survival in Adult Recipients Transplanted with Single Pediatric Kidneys

Abstract

Background: There is insufficient data on the impact of recipient body mass index (BMI) on the long-term graft survival of adult patients transplanted with single pediatric kidneys. Methods: We performed a retrospective analysis of adult patients transplanted with single pediatric kidneys at our center. The recipients were classified into 2 groups: group 1 (BMI ≥30) and group 2 (BMI <30). Donor/recipient demographics, postoperative outcomes and survival rates were compared between the 2 groups. Results: There was no significant difference in donor/recipient demographics between the 2 groups. In group 1, the death-censored graft survival (DCGS) at 1, 3 and 5 years was 90% at all 3 time points, and in group 2 it was 86, 68 and 60%, respectively (p = 0.05). The mean glomerular filtration rate (with standard deviation in parentheses) at 1, 3 and 5 years was, respectively, 55 (15), 59 (19) and 55 (28) ml/min for group 1, compared to 65 (28), 69 (23) and 67 (20) ml/min in group 2 (p = NS). Multivariate analysis revealed a hazard ratio of 5.12 (95% confidence interval 1.06–24.7; p = 0.04) for graft loss in nonobese patients when compared to obese patients. Obese patients had an increased risk for acute rejections within the first month of transplant (p = 0.02). Conclusion: Patients with a BMI ≥30 transplanted with single pediatric kidneys have better DCGS rates when compared to nonobese patients.