Persistent ECG ST-segment Depression For Diagnosing Value Coronary Artery Disease

Objective:To analyze the relationship of persistent resting ECG ST-segment depression and coronary artery disease,as well as the extent of coronary artery disease,the relation of persistent resting ECG ST-segment depression and organic heart disease.Methods:I choosed patients who were diagnosed as coronary artery disease initially for chest pain in January 2007 to September 2008 in our hospital,all patients underwent standard 12-lead resting ECG,cardiac ultrasound dynamic examination and selectively coronary angiography.To statistic on the branch of the occurrence of coronary artery disease,statistic the incidence rate of persistent ECG ST-segment depression in patients with the different extent of coronary artery disease,to analyze the sensitivity and specificity of ECG diagnosis of coronary heart disease,explore the the importance of ECG in diagnosing the coronary artery disease,as well as the relationgship between the diagnosis and the different extent of coronary artery disease.To statistic the the occurrence rate of persistent ST-segment depression in other diseases except coronary artery disease,the relationgship between the changes of cardiac structure and the persistent ECG ST-segment depression,as well as the connection between the relationship and the different extent of coronary artery disease,for further accoutting for the importance of persistent ECG ST-segment depression in diagnosin of coronary artery disease,in order to provide the value of clinical diagnosis.Results:There are 430 patients are selected with selection criteria except exclusion criteria,there are 277 men patients,the and 153 women patients.There are 179 patients who are positive on resting ECG,and the others are negative on resting ECG.There are 212 patients who are coronary heart disease,and the others are non-coronary heart disease.The incidence of coronary heart disease for 37.4%in the groups of positive resting ECG,there are 31.6 patients in 100 patients who are persistent ECG ST-segment depression in the groups of coronary heart disease.In 218 cases of patients with negative coronary angiography,98 cases of hypertension,of which 58 cases whose ECG ST segment are depressed.In ECG-positive group,75.5%of patients have cardiac structural changes,and in the group of coronary heart disease,only 11.7%of patients who have nomal cardiac structural are positive in resting ECG,and the other 88.3%of patients are negative in resting ECG.I analyse the patients who have different extent of coronary artery disease,detect that the extent of coronary artery disease with persistent ST-segment depression and cardiac changes in the structure of no significant correlation.Conclusion:The results demonstrate that only one third of patients who are coronary heart disease appear persistent resting ECG ST-segment depression,and in the groups of different coronary artery disease,there is no obvious relation between the rate of continuity ST segment depression and and the extent of coronary artery.In other group who have persistent resting ECG ST-segment depression,only a few of patients are coronary artery disease,however,these patients with coronary heart disease more associated with abnormal cardiac structure.And also found in patients with normal cardiac structure,only a few portion appear ECG ST-segment depression,the patients with ECG abnormalities,most of which accompanied by changes in the structure of the heart.So we can see,resting ECG diagnosis of coronary artery disease was not high,we should be careful if we want to take persistent ST-segment depression on resting ECG as electrocardiographic diagnostic criteria of coronary heart disease.