Increased late mortality with percutaneous stenting for unprotected left main coronary artery stenosis relative to coronary artery bypass grafting: a meta-analysis of observational studies.

Study selection Comparative studies of percutaneous coronary stenting versus coronary artery bypass grafting that enrolled patients with unprotected left main coronary artery stenosis were eligible for inclusion. Eligible studies had to provide adjusted hazard ratios (HRs) for mortality with at least one year of follow-up. Studies from which hazard ratios or risk estimates could not be extracted were excluded. The main outcomes were adjusted hazard ratios for mortality with at least one year of follow-up.