Background Among patients with advanced multivessel coronary disease,left ventricular (LV) function is widely variable,and clinical and angiographic correlates of ventricular dysfunction remain to be defined.Methods Among 73 339 patients undergoing diagnostic cardiac catheterization at a single center in China,patients with left ventriculographic assessment were identified with three-vessel coronary disease with or without left main involvement.Clinical and angiographic characteristics were examined among patients with normal or varying extent of LV dysfunction,and predictors of LV impairment (ejection fraction (EF): ＜25％,25％-40％ or ＞40％) were determined.Results Among 11950 patients identified with three-vessel coronary disease,the sample distribution of LVEF was ＞40％,n=10776; 25％-40％,n=948; ＜25％,n=226.Patients with reduced LV function (＜40％) more commonly were male and had a history of myocardial infarction (MI),diabetes or unstable angina.Hypertension was more frequent in those with LVEF ≥40％.In a multivariate Logistic regression analysis,prior MI (odds ratio (OR),3.37; 95％ confidence interval (CI),2.96-3.84) was most predictive of LVEF ＜40％,followed by male gender,diabetes,and presentation with unstable angina.For LVEF ＜25％,only prior MI was identified as a significant correlate of severe LV dysfunction (OR 4.06,95％ CI 3.06-5.39).Following exclusion of patients with previous MI (n=7416),male gender and diabetes were predictive of LVEF ＜40％,yet presentation with unstable angina was the only factor significantly associated with LVEF ＜25％.Conclusion Among individuals identified with three-vessel coronary disease with or without left main involvement,previous MI was the most significant risk factor of LV dysfunction.