Comparison of Clinical Outcomes between the Ostial Versus Non-Ostial Culprit in Proximal Left Anterior Descending Artery Acute Myocardial Infarction

Percutaneous coronary interventions to the proximal left anterior descending artery (pLAD)-acute myocardial infarction (AMI) are still challenging, especially in the ostial pLAD. Clinical outcomes of the ostial pLAD-AMI were not well investigated. The aim of the present study was to compare clinical outcomes of the ostial pLAD-AMI with those of the non-ostial pLAD-AMI. The primary endpoint was the major cardiovascular events (MACE), defined as the composite of cardiac death, AMI, stent thrombosis (ST), target lesion revascularization (TLR), and target vessel revascularization (TVR). Between January 2009 and March 2016, a total of 401 pLAD-AMI were included as the study population and were divided into 78 ostial pLAD-AMI (the ostial pLAD group), and 323 non-ostial pLAD-AMI (the non-ostial pLAD group). The median follow-up duration was 414 days. The MACE tended to be higher in the ostial pLAD group (8.0% at 30 days, 19.9% at 400 days) than in the non-ostial pLAD group (4.4% at 30 days, 12.9% at 400 days) without reaching statistical significance (P = 0.087). The prevalence of cardiac death was significantly higher in the ostial pLAD group (6.6% at 30 days, 9.5% at 400 days) as compared with the non-ostial pLAD group (3.1% at 30 days, 4.5% at 400 days) (P = 0.034). There were no significant differences in ST, AMI, TLR, or TVR. We concluded that, as compared with the non-ostial pLAD-AMI, the clinical outcomes of the ostial pLAD-AMI, especially cardiac death, tended to be worse, requiring special attention to the ostial pLAD-AMI.