Kidney allograft function and histology in recipients dying with a functioning graft

Area of Science:

• Nephrology
• Transplantation Immunology
• Pathology

Background:

• Death with function (DWF) is a significant cause of kidney allograft loss.
• Allograft dysfunction is suspected to contribute to DWF.
• Understanding the relationship between allograft function and DWF is critical for improving patient outcomes.

Purpose of the Study:

• To investigate the association between kidney allograft function, assessed by estimated glomerular filtration rate (eGFR) and histology, and the occurrence of DWF.
• To identify risk factors associated with DWF in kidney transplant recipients.

Main Methods:

• Retrospective analysis of 1842 kidney allografts transplanted between 1996 and 2010.
• Estimation of GFR using the MDRD equation.
• Analysis of kidney biopsies obtained 12 months post-transplant and within one year of DWF.
• Application of proportional hazards models to assess the relationship between eGFR and DWF.

Main Results:

• During a median follow-up of 68 months, 14% of recipients experienced DWF.
• Risk factors for DWF included older recipient age, diabetes, prior dialysis, and lower eGFR.
• A significant proportion of DWF recipients (84%) had eGFR above 40 mL/min/1.73 m² prior to death.
• Most biopsies within one year of DWF showed benign histology, comparable to controls.

Conclusions:

• Kidney allograft dysfunction is independently associated with an increased risk of DWF.
• However, the majority of DWF cases occur in patients with preserved allograft function and histology.
• These findings highlight the complexity of DWF and suggest that factors beyond detectable allograft dysfunction contribute to this outcome.