Impact of Chronic Renal Failure on Ischemic and Bleeding Events at 1 Year in Patients With Acute Coronary Syndrome (from the Multicenter START ANTIPLATELET Registry)

Chronic renal failure (CRF) impairs prognosis in patients with acute coronary syndromes (ACS); the differential impact of CRF on ischemic and bleeding events in the setting of ACS is unclear. We explored the predictive role of CRF, identified by different equations for the glomerular filtration rate estimation, on the occurrence of the composite end point, including both ischemic cardiovascular and major bleeding (major adverse cardiovascular and bleeding events [MACBE]) at 1 year, and its components. We accessed each patients data from 718 participants in the prospective, multicenter, and START ANTIPLATELET registry, performed on patients with ACS. The ability to predict the risk of MACBE was modest and similar for Cockcroft-Gault, MDRD, and CKD-EPI equations (area under the curves: 0.55, 95% confidence interval [CI] 0.47 to 0.63; 0.53, 95% CI 0.45 to 0.61; 0.54, 95% CI 0.46 to 0.62; respectively, overall p = 0.63). The incidence of MACBE in patients with CRF was 12.6 versus 7.4 per 100 patients/year in those with preserved renal function (adjusted odds ratio [OR] 1.80, 1.02 to 3.20, p = 0.045); the absolute excess in events rate due to CRF was higher for ischemic events (3.5%) than for major bleeding (2.6%). The increased occurrence of MACBE was even greater in patients with CRF and concomitant anemia (OR 2.16) and in patients with severe CRF (OR 2.78). In conclusion, our study indicates that, in patients with ACS, CRF impairs the clinical outcome at 1 year, especially when severe and when is concomitant with anemia. CRF is associated with greater absolute increase of ischemic events than major bleeding.