Application value of 24-hour ambulatory electrocardiography in diagnosing silent myocardial ischemia
Objective To investigate the application value of 24-hour ambulatory electrocardiography(AECG)in the diagnosis of silent myocardial ischemia(SMI).Methods A total of 135 patients with suspected SMI were selected as the research subjects,and they underwent both routine ECG and 24-hour AECG.The detection rate of SMI was compared between the two examination methods.The diagnostic efficiency of SMI was analyzed by using coronary angiography(CAG)as the gold standard.Results Among the 135 patients suspected with SMI,107 cases were confirmed by CAG.Ninety-two cases were detected by routine ECG with a positive detection rate of 85.98％(92/107)while 24-hour AECG detected 102 cases with a positive rate of 95.33％(102/107).The positive rate of 24-hour AECG proves to be significantly higher than that of routine ECG(x2=5.515,P=0.019).The diagnostic sensitivity,accuracy rate and negative predictive value of 24-hour AECG were 94.39％,94.81％and 81.82％,respectively,which were all significantly higher than those of routine ECG(separately 84.11％,85.93％and 60.47％;P<0.05).Conclusion The 24-hour AECG could improve the sensitivity and accuracy in the diagnosis of SMI.
coronary heart diseasesilent myocardial ischemia24-hour ambulatory electrocardiographyroutine electrocardiogramdiagnostic value
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