Coronary angiography is the best predictor of events in renal transplant candidates compared with noninvasive testing

Area of Science:

• Cardiology
• Nephrology
• Transplant Medicine

Background:

• Current guidelines for detecting coronary artery disease (CAD) and assessing cardiac risk in renal transplant candidates rely on noninvasive testing data from nonuremic populations.
• The accuracy and predictive value of these noninvasive methods in the unique context of renal transplant candidates remain uncertain.

Purpose of the Study:

• To prospectively evaluate the accuracy of two noninvasive tests and risk stratification in detecting significant CAD (>=70% obstruction) and assessing cardiac risk in renal transplant candidates.
• To compare the diagnostic performance of myocardial scintigraphy (SPECT) and dobutamine stress echocardiography against coronary angiography (CA).

Main Methods:

• 126 renal transplant candidates at moderate or high cardiac risk underwent SPECT, dobutamine stress echocardiography, and CA.
• Patients were followed for 6 to 48 months for cardiac events.
• Prevalence of CAD and event-free survival rates were analyzed.

Main Results:

• The prevalence of CAD was 42% among the study cohort.
• Both noninvasive tests and risk stratification demonstrated sensitivities and negative predictive values below 75%.
• Critical coronary lesions (>=70% stenosis) identified by CA were the sole significant predictor of cardiac events (P=0.003), with significantly lower event-free survival in patients with critical lesions.

Conclusions:

• Noninvasive testing and current risk stratification algorithms appear insufficient for accurately detecting CAD and assessing cardiac risk in renal transplant candidates.
• Coronary angiography remains a necessary tool for definitive CAD detection and cardiac risk assessment in this population.
• Current guidelines for noninvasive testing in renal transplant candidates may require revision based on these findings.