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  • Title: Association of Slow Graft Function with Long-Term Outcomes in Kidney Transplant Recipients.
    Author: Wang CJ, Tuffaha A, Phadnis MA, Mahnken JD, Wetmore JB.
    Journal: Ann Transplant; 2018 Apr 03; 23():224-231. PubMed ID: 29610451.
    Abstract:
    BACKGROUND Whether slow graft function (SGF) represents an intermediate phenotype between immediate graft function (IGF) and delayed graft function (DGF) in kidney transplant recipients is unknown. MATERIAL AND METHODS In a retrospective cohort analysis of 1,222 kidney transplant recipients, we classified patients as having IGF, SGF, and DGF using two different schemas. SGF was defined as serum creatinine (Cr) ≥3.0 mg/dL by postoperative day 5 in Schema 1, and in Schema 2, SGF was defined as Cr >1.5 mg/dL plus a creatinine reduction ratio <20% between postoperative days 1 and 3. A complementary log-log model was used to examine the association of graft function with graft survival and patient survival. RESULTS Mean age of study patients was 51.5±13.3 years, 59.9% were male, and 66.7% were white. In Schema 1, SGF and DGF were associated with comparable increases in risk of graft failure compared to IGF (hazard ratio (HR) 1.46, 95% confidence intervals (CI) 1.02-2.10 for SGF and HR 1.56, CI 1.11-2.22 for IGF); estimates were similar for Schema 2 (HR 1.52, CI 1.05-2.20 for SGF and HR 1.54, CI 1.10-2.17 for IGF). However, for mortality, outcomes for SGF were similarly to IGF, both SGF and IGF were associated with lower risk relative to DGF (HR 0.54, CI 0.36-0.80 for SGF in Schema 1; HR 0.58, CI 0.39-0.85 for SGF in Schema 2). CONCLUSIONS These findings suggest that SGF may be a marker for graft failure but not for mortality, and SGF may therefore represent a phenotype separate from IGF and DGF.
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