Machine perfusion: not just for marginal kidney donors

Area of Science:

• Nephrology
• Transplantation immunology
• Surgical innovation

Background:

• Machine perfusion (MP) is increasingly used for donated kidneys to enhance graft function.
• Optimal donor populations for MP application remain unclear.
• Standard-criteria donor kidneys are typically preserved using cold storage (CS).

Purpose of the Study:

• To evaluate the efficacy of machine perfusion (MP) versus cold storage (CS) in reducing delayed graft function (DGF) in de-novo kidney transplantation.
• To determine if MP offers benefits beyond marginal donor kidneys.

Main Methods:

• Retrospective review of the UNOS database (2005-2011) for adult isolated kidney transplants from standard-criteria donors.
• Primary endpoint: Delayed graft function (DGF), defined as requiring dialysis within 7 days post-transplant.
• Statistical analyses included multivariable logistic regression, propensity-matched cohorts, and a paired-kidney study.

Main Results:

• Unadjusted DGF rates were lower with MP (18.6%) compared to CS (22.4%).
• Multivariable analysis showed MP reduced DGF odds by 41% (OR 0.59, P < 0.001).
• Propensity-matched and paired-kidney studies confirmed MP's significant DGF reduction (OR 0.59 and 0.6, respectively).

Conclusions:

• Machine perfusion is effective in reducing delayed graft function in kidney transplants, even when using standard-criteria donors.
• The benefits of MP extend beyond marginal kidneys and should be considered for broader application.
• MP improves kidney graft outcomes by minimizing early post-transplant dysfunction.