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To explore the clinical predictive factors of coronary artery stenosis located distally to myocardial bridging (MB).A total of 603 patients with MB-mural coronary artery (MB-MCA) diagnosed by angiography initially were enrolled during May 2004 to May 2009. Their angiographic and clinical data were collected according to an uniform protocol. And standard questionnaires were used to acquire demographic information and clinical examinations. Univariate and multivariate analysis were performed to explore the related clinical predictive factors.A total of 644 MB-MCAs were detected. Diastolic vessel diameters in MCAs were significantly smaller than those in reference segments ( (2.29 ± 0.39) vs (2.48 ± 0.40) mm, P0.001) . Lesions located distally to MB detected in 36 patients were significantly fewer than those proximally to MB in 382 patients (5.9% vs 62.4%, P0.001) . Univariate analysis suggested that the narrowing degree of vessel located proximally to MB, the narrowing degree and the number of diseased coronary vessels of non-MB-MCAs and course of hypertension were positively correlated with the narrowing degree of vessel located distally to MB (all P0.05) . Multivariate Logistic regression analysis suggested that the number of cigarettes per day, the narrowing degree of diseased coronary vessels of non-MB-MCAs, the narrowing degree of vessel located proximally to MB and diastolic narrow rate of MCA were positively correlated with the occurrence of coronary artery stenosis located distally to MB (all P0.05) . Their standardized coefficients (β) were 0.763, 0.727, 0.420 and 0.403 respectively. And the corresponding Exp (β) were 2.146 (1.089-4.229) , 2.070 (1.371-3.125) , 1.521 (1.050-2.204) and 1.496 (1.094-2.045) .The number of cigarettes per day, the narrowing degree of diseased coronary vessels of non-MB-MCAs, the narrowing degree of vessel located proximally to MB and diastolic narrowing rate of MCA are likely to be important clinical predictive factors of coronary artery stenosis located distally to MB.

To study the incidence rates, risk factors, prevention and treatments of complications of selective coronary arteriography.A retrospective survey was conducted on the data of the incidence and annual distribution characteristics of complications among 9 196 cases that underwent selective coronary arteriography performed October 1987 to December 2000, and analyze the risk factors and prevention and treatment of these complications.The total complication rate was 1.33%. The procedure-related mortality rates were 0.02%. The incidence rate of non-fatal Q wave myocardial infarction, coronary artery spasm, severe arrhythmia, severe contrast allergic reaction, peripheral vascular complication, and heart failure in coronary arteriography was 0.01%, 0.13%, 0.29%, 0.04%, 0.35%, and 0.08%, respectively. No emergent coronary artery bypass surgery was required in patients with coronary arteriography. The independent risk factors of the complications of coronary arteriography included unstable angina, coronary multivessel disease, left main coronary artery disease and heart failure.The complication rate of coronary arteriography decrease with the accumulation of experience. The complication rate in this group is lower than in other reports probably due to strictly selecting of indication and active prevention and treatment of complications.