Wedge Versus Core Biopsy at Time Zero: Which Provides Better Predictive Value for Delayed Graft Function With the...

Area of Science:

• Nephrology
• Transplant Surgery
• Pathology

Background:

• Histopathological assessment of time-zero renal biopsies is crucial for predicting graft outcomes, especially with marginal donors.
• Current methods like wedge and core biopsies lack evidence regarding efficacy and safety.
• This study compares the diagnostic yield of wedge versus core biopsies for pre-implantation assessment.

Purpose of the Study:

• To compare the histopathological information obtained from wedge biopsies versus core biopsies.
• To evaluate the safety and efficacy of both biopsy techniques for pre-implantation renal allografts.
• To determine which biopsy method better predicts delayed graft function (DGF).

Main Methods:

• Prospective evaluation of 37 wedge and 30 core biopsies.
• Collection of histopathological data: number of glomeruli and arterioles, Remuzzi scoring (glomerulosclerosis, tubular atrophy, interstitial fibrosis, arteriolar narrowing).
• Correlation of biopsy findings with clinical data on delayed graft function (DGF).

Main Results:

• Wedge biopsies yielded more glomeruli (81% vs 50%) and fewer arterioles (32% vs 57%) compared to core biopsies.
• Wedge biopsies were more sensitive in detecting glomerulosclerosis, tubular atrophy, and interstitial fibrosis.
• Higher sensitivity and positive predictive value for DGF prediction with Remuzzi score ≥ 4 on wedge biopsies.

Conclusions:

• Wedge biopsies are safe and superior to core biopsies for identifying significant histopathological findings in pre-implantation renal biopsies.
• Wedge biopsy is recommended as the method of choice for time-zero biopsies.
• This approach aids in better assessment of graft quality and prediction of post-transplant outcomes.