Objective:To explore the correlation between coronary angiography and resting 12-lead ECG characteristics in myocardial bridge. Methods:70 patients of simple myocardial bridge were retrospectively analyzed in coronary angiography and electrocardiographic feature. Results:Among 640 patients receiving coronary angiography from June 2016 to June 2018 in our hospital, 101 patients were diagnosed of myocardial bridge. After excluding fixed stenosis combined with myocardial bridge, 70 simple patients with myocardial bridge were taken as research objects. 35 men and women were aged (59.25±9.58) and (61.71±7.48) years old respectively. There were significant differences in ages (t=2.178,P=0.033). There were very significant differences in ECG ST change incidences of different Nobel classifications (χ2=10.104,P=0.005). The incidences of ECG ST change were 2.9%, 5.7% and 7.1% respectively in Nobel Ⅰ, Ⅱ and Ⅲ. There were significant differences in sinus bradycardia incidences among different coronary dominant patterns (χ2=8.123, P=0.017). The incidences of sinus bradycardia were 5.7%, 10.0% and 5.7% respectively.Among 15 cases found with bundle branch block, there were 3 cases with complete right bundle branch block combining left anterior branch block and 12 cases with incomplete right bundle branch block or left anterior branch block; 14 cases were at the middle of left anterior descending artery and 1 case at far of left anterior descending artery. Conclusion:There is no change on ECG ST segment in patients with myocardial bridge, but abnormalityis only seen in serious stenosis of coronary artery. Patients with myocardial bridge have higher incidence of sinus bradycardia and bundle branch block. |
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