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Since older age is a strong predictor of not only bleeding but also of ischemic events, understanding the risk:benefit profile of bivalirudin in the elderly undergoing primary percutaneous coronary intervention (pPCI) for ST-segment elevation (STEMI) is important. For this, we aim to compare elderly with young patients, who all underwent pPCI for STEMI and randomly received either bivalirudin or heparin.We performed a patient-level pooled analysis (n = 5800) of two large randomized trials. A total of 2149 (37.1%) elderly patients (>65 years of age) with STEMI were enrolled and randomly assigned to either bivalirudin or heparin with or without a GPI (control group) before pPCI. Clinical outcomes at 30 days were analyzed.In elderly patients, bivalirudin significantly reduced non-CABG major bleeding (7.1% vs 10.4%; P < .01), subacute ST (0.4% vs 1.5%; P < .01), and net adverse clinical events (NACE; composite of all-cause mortality, reinfarction, IDR, stroke or protocol-defined non-CABG major bleeding [13.7% vs 17.2%; P = .03]) with comparable rates of stroke, MI, acute ST, or all-cause death, when compared with heparin with or without GPI.In a large group of elderly patients enrolled in the EUROMAX and HORIZONS-AMI trials, bivalirudin was associated with lower 30-day rates of non-CABG major bleeding, subacute ST and NACE, with similar 30-day rates of acute ST and mortality.