Abstract：ObjectiveTo investigate the diagnostic efficiency of routine electrocardiogram (ECG) and ambulatory electrocardiography (AECG) for coronary heart disease (CHD), and to analyze the characteristics of fragmented QRS complex (fQRS) in ECG, providing references for making early clinical diagnosis and intervention program. MethodsWe selected 80 patients with suspected CHD as research objects. ECG and AECG examinations were both performed on them after admission. With the results of coronary angiography as “gold standard”, statistics were performed on the diagnostic results and efficiency of ECG and AECG for CHD, and the detection rates of different types of arrhythmias in CHD patients were compared between the two examination methods. The characteristics of fQRS in ECG were analyzed among CHD patients. ResultsThe results of ECG examination showed that in the 80 examinees, there were 45 arrhythmia positive cases and 35 negative cases, while AECG examination detected 55 positive cases and 25 negative cases. Compared with ECG, the sensitivity and accuracy rate of AECG for the diagnosis of CHD were significantly higher (74.14% vs. 93.10%, 78.75% vs. 93.75%), while the rate of missed diagnosis was significantly lower (25.76% vs. 6.90%, all P＜0.05). The detection rates of atrioventricular block, atrial premature beats, premature ventricular contraction, paired atrial premature beats, paired premature ventricular contraction, short paroxysmal supraventricular tachycardia and paroxysmal atrial fibrillation by AECG examination in CHD patients were significantly higher than those by ECG (all P＜0.05). The incidence of ECG fQRS in CHD patients was significantly higher than that in cases without CHD (P＜0.05), and most of fQRS occurred in the inferior wall lead. ConclusionThe accuracy rate of AECG in the diagnosis of CHD is significantly higher than that of ECG, which provides a basis for clinical early screening and diagnosis. AECG could be used to evaluate arrhythmias clinically and formulate intervention programs correspondingly.
