Kidney Transplant Outcomes in the Super Obese: A National Study From the UNOS Dataset

Pooja Kanthawar, Xiaonan Mei, Michael F. Daily, Jyotin Chandarana, Malay Shah, Jonathan Berger, Ana Lia Castellanos, Francesc Marti, Roberto Gedaly

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Background: We evaluated outcomes of super-obese patients (BMI > 50) undergoing kidney transplantation in the US. Methods: We performed a review of 190 super-obese patients undergoing kidney transplantation from 1988 through 2013 using the UNOS dataset. Results: Super-obese patients had a mean age of 45.7 years (21–75 years) and 111 (58.4 %) were female. The mean BMI of the super-obese group was 56 (range 50.0–74.2). A subgroup analysis demonstrated that patients with BMI > 50 had worse survival compared to any other BMI class. The 30-day perioperative mortality and length of stay was 3.7 % and 10.09 days compared to 0.8 % and 7.34 days in nonsuper-obese group. On multivariable analysis, BMI > 50 was an independent predictor of 30-day mortality, with a 4.6-fold increased risk of perioperative death. BMI > 50 increased the risk of delayed graft function and the length of stay by twofold. The multivariable analysis of survival showed a 78 % increased risk of death in this group. Overall patient survival for super-obese transplant recipients at 1, 3, and 5 years was 88, 82, and 76 %, compared to 96, 91, 86 % on patients transplanted with BMI < 50. A propensity score adjusted analysis further demonstrates significant worse survival rates in super-obese patients undergoing kidney transplantation. Conclusion: Super-obese patients had prolonged LOS and worse DGF rates. Perioperative mortality was increased 4.6-fold compared to patients with BMI < 50. In a subgroup analysis, super-obese patients who underwent kidney transplantation had significantly worse graft and patient survival compared to underweight, normal weight, and obesity class I, II, and III (BMI 40–50) patients.

Original languageEnglish
Pages (from-to)2808-2815
Number of pages8
JournalWorld Journal of Surgery
Issue number11
StatePublished - Nov 1 2016

ASJC Scopus subject areas

  • Surgery


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