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Data on the clinical outcomes of percutaneous coronary intervention (PCI) for unprotected left main coronary artery (LMCA) in patients with acute coronary syndrome (ACS) are limited. Therefore, this study aimed to assess the clinical outcome of patients with ACS who underwent PCI for LMCA culprit lesion.Methods and Results:Of 1,809 patients enrolled in the Assessing Optimal Percutaneous Coronary Intervention for the LMCA (AOI-LMCA) registry (a retrospective 6-center registry of consecutive patients undergoing LMCA stenting in Japan), the current study population consisited of 1,500 patients with unprotected LMCA stenting for LMCA ACS (ACS with shock: 115 patients, ACS without shock: 281 patients) and stable CAD (1,104 patients). The cumulative 180-day incidence of death was markedly higher in the ACS with shock group than in the other groups (49.5%, 8.6%, and 3.3%, respectively; P&lt;0.0001), but mortality beyond 180-day was not significantly different among the 3 groups (30.2%, 20.4%, and 19.5%, respectively; P=0.65). In the ACS with shock group, the initial TIMI flow grade did not affect 5-year mortality (57.1% and 62.2%, P=0.99), but in the ACS without shock group, 5-year mortality was significantly higher in patients with initial TIMI flow grade ≤1 than in patients with TIMI flow grade ≥2 (44.4% and 23.7%, respectively; P=0.008).

Acute Coronary Syndrome With Unprotected Left Main Coronary Artery Culprit ― An Observation From the AOI-LMCA Registry ―