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Background In-stent restenosis (ISR) remains a challenge for coronary artery disease (CAD) patients who undergo percutaneous coronary intervention (PCI) with stents, and risk factors for ISR are controversial. This study aimed to investigate the incidence and risk factors of ISR in patients from southern China. Methods In this retrospective study, patients diagnosed as acute coronary syndromes (ACS) and underwent successful PCI with drug-eluting stent (DES) and conducted a follow-up coronary angiography in Center for Cardiovascular Diseases of Meizhou People’s Hospital at the period of January 1st, 2016 to January 1st, 2021 were included for analysis. The clinical and angiographic factors were compared between patients in ISR ( +) and ISR (−) groups. The association between variables and ISR was evaluated by multivariate logistic regression model. Result A total of 341 ACS patients who had been installed at least 1 stent were included in this study. The follow-up time was 34.2 ± 17.2 months. During the follow-up period, 62 (18.2%) patients experienced ISR, and the average time for ISR was 32.8 months; the incidence of ISR for left main coronary artery, left anterior descending coronary artery, left circumflex artery coronary artery and right coronary artery were 6.7%, 20.9%, 19.4% and 14.4%, respectively; left ventricular ejection fraction (LVEF), stent number, stent type, statin therapy, antiplatelet therapy were significantly different between patients in ISR ( +) and ISR (−) group. Multivariate logistic analysis suggested that LVEF and stent number were significantly correlated with ISR. Conclusion Our study revealed the incidence and risk factors of ISR in patients from southern China. Our data suggested that LVEF and stent number were independent risk factors associated with ISR.

Incidence and risk factors of in-stent restenosis after percutaneous coronary intervention in patients from southern China