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Abstract Objective To investigate the clinical value of electrocardiogram(ECG) in diagnosing dilated cardiomyopathy(DCM). Methods The routine 12 lead synchronous ECGs of 102 DCM patients were selected. ECG abnormalities were analyzed among those cases, including arrhythmia, conduction block, ST-T changes, abnormal Q waves, low voltage in limb leads, poor progression of R wave in precordial leads and high voltage in left chest leads, etc. Results The incidence of arrhythmia was 46.08% while premature ventricular contraction and atrial fibrillation was the most common. The incidence of conduction block was 42.16%, with the first degree atrioventricular block and complete left bundle branch block accounting for the highest proportion. The incidence of ST-T changes was as high as 94.12%. The occurrence rate of abnormal Q waves, low voltage in limb leads and poor progression of R wave in precordial leads was 21.57%, 13.73% and 67.65%, respectively. The incidence was 36.27% whenRV5+SV1≥3.5 mV or RV6≥3.5 mV, and that of RV6/RV5>1 was 61.76%. The occurrence rate was 36.27% when the voltage sum of of R waves and S waves in three successive heart beats equalled to the total voltage of QRS complex(V6>V5); the rate of RV6/Rmax≥3 was 31.37%.Conclusion A variety of abnormal ECG performances usually appear in patients with dilated cardiomyopathy. Routine 12 lead ECG proves to be practically valuable in diagnosing the disease.
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