Kidney Allograft Rejection as an Independent Nontraditional Risk Factor for Post-Transplant Cardiovascular Events

Area of Science:

• Nephrology
• Cardiology
• Transplantation Immunology

Background:

• Cardiovascular disease (CVD) is the primary cause of mortality in kidney transplant recipients (KTR).
• Previous research on post-transplant cardiovascular events (CVE) often overlooked post-transplant factors and mixed immunosuppression types.
• This study focuses on KTR under tacrolimus-based immunosuppression, integrating both pre- and post-transplant variables.

Purpose of the Study:

• To identify pre- and post-transplant factors associated with cardiovascular events (CVE) in kidney transplant recipients (KTR).
• To specifically evaluate these factors in KTR receiving tacrolimus-based immunosuppression.
• To improve risk prediction models for post-transplant CVE.

Main Methods:

• Competing risk regression analysis was employed.
• Included participant demographics, transplant characteristics, and time-updated post-transplant variables.
• The primary outcome was a composite of major cardiovascular events (myocardial infarction, heart failure, stroke, peripheral arterial disease, cardiovascular death).

Main Results:

• The incidence of post-transplant CVE was 15.88 per 1,000 patient-years in 553 KTR.
• Key risk factors identified include recipient age, diabetes, elevated HbA1c, reduced creatinine clearance, hypercalcemia, and allograft rejection.
• Both T cell-mediated and antibody-mediated rejection significantly increased CVE risk (3.0-fold and 3.38-fold, respectively).
• Models incorporating post-transplant variables showed superior prediction performance compared to pre-transplant factors alone.

Conclusions:

• Allograft rejection is a significant risk factor for post-transplant cardiovascular events (CVE).
• Surveillance for CVE in kidney transplant recipients (KTR) should actively include those with a history of allograft rejection.
• Integrating post-transplant variables enhances the prediction of cardiovascular risk in KTR.