ECG includes ECG and 24-hour Holter. The main diagnosis have a definite value for arrhythmias and conduction disturbances. The diagnosis of myocardial infarction has a high accuracy, it can not only determine myocardial infarction, but also to determine the stage of disease infarction, the location, extent and evolution. Atrioventricular hypertrophy, diagnose myocarditis, coronary heart disease, pericarditis have more help. To help understand the role of certain drugs (such as digitalis, quinidine, etc.) and electrolyte imbalance of the heart muscle.
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