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This study aimed to evaluate the efficacy of percutaneous coronary intervention (PCI) for significant atherosclerosis lesions proximal to myocardial bridge (MB) at left anterior descending coronary artery (LAD).A total of 330 consecutive patients with LAD significant stenosis, diagnosed as acute coronary syndrome (ACS), were included. Based on whether combined with MB, the patients were divided into the MB group (MB, n = 48) and non-MB group (NMB, n = 282). Drug eluting stents (DES) were successfully implanted in the stenostic segments prior to MB. All patients were followed up during the hospital stay, 30 days and 12 months after PCI, to evaluate the major adverse cardiac events (MACEs).There was no difference in the incidence of MACEs between the two groups (6.2% versus 2.1%, P = 0.254) when in the hospital. During the follow-up of 30 days and 12 months after PCI, the rate of MACEs was significantly higher in the MB group than in the NMB group (18.2% versus 6.4% and 43.8% versus 17.0%, respectively, P &lt; 0.001). Stent restenosis occurred in four patients in the MB group; whereas, in five patients in the NMB group, the rate of stent restenosis was higher in the MB group than in the NMB group (8.3% versus 1.8%, P = 0.036). Cox proportional hazards regression analysis revealed that the presence of MB was an independent predictor of MACEs (hazard ratio (HR) = 1.781, 95% confidence intervals (95% CI) = 1.108-2.863, P = 0.017).DES implantation for significant atherosclerosis stenosis in the segments proximal to MB have higher incidence of MACEs. MB appears to be associated with a higher incidence of stent restenosis after PCI and is a significant factor in the occurrence of MACEs.

international heart journal

The Outcome of Percutaneous Coronary Intervention for Significant Atherosclerotic Lesions in Segment Proximal to Myocardial Bridge at Left Anterior Descending Coronary Artery