Background: In living donors, if both kidneys are considered to be of equal quality, the side with favorable anatomy for transplant is usually selected. A "suboptimal kidney" is a kidney that has a significant abnormality and is chosen to maintain the principle of leaving the better kidney with the donor. We hypothesized that the long-term outcome of suboptimal kidney is inferior to that of the normal kidney.
Methods: In a retrospective analysis of 1744 living donor kidney transplantations performed between 1999 and 2015 at our institution, 172 allografts were considered as a suboptimal kidney (9.9%). Median length of follow-up after living donor kidney transplantation was 59.5 months (interquartile range 26.3-100.8). This study strictly complied with the Helsinki Congress and the Istanbul Declaration regarding donor source.
Results: The reasons for suboptimal kidneys were cysts or tumors (46.5%), arterial abnormalities (22.7%), inferior size or function (19.8%), and anatomic abnormalities (11.0%). Suboptimal kidneys showed worse long-term overall graft survival regardless of the reasons (5-year: control vs suboptimal kidney; 88.9% vs 79.3%, P = .001 and 10-year: 73.6% vs 63.5%, P = .004). Suboptimal kidneys showed a 1.6-fold higher adjusted hazard ratio (aHR) of all-cause graft loss (95% confidence interval [CI]: 1.1-2.5, P = .025) and had the same impact as older donor age (≥ 54 years old, aHR: 1.6, 95% CI: 1.1-2.4, P = .008).
Conclusions: The impact of suboptimal kidney should be factored into the donor selection process.
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| http://dx.doi.org/10.1016/j.transproceed.2020.01.151 | DOI Listing |
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