There are many, many ECG abnormalities, common ones are arrhythmia such as sinus arrhythmia, atrial fibrillation, etc., intraventricular conduction block such as bundle branch block, myocardial ischemia and myocardial infarction, atrial hypertrophy, drug effects and electrolyte disorders, and several other conditions. 1. Sinus arrhythmia: clinically, the frequency of normal sinus rhythm is 60~100 times/minute. If the heart rate >100 times / min called sinus tachycardia, if there are symptoms need to take oral metoprolol and other drugs. If the heart rate is 60 beats/minute, it is called sinus bradycardia, and a pacemaker can be installed if necessary. 2. Atrial arrhythmia: common atrial pre-systole, atrial fibrillation. Usually, atrial pre-systole mainly suggests that the P wave occurs in advance, and the morphology is different from that of sinus P wave, so it is recommended to observe, and no special treatment is usually needed. 3. Atrial fibrillation: If the P wave disappears on the ECG and the F wave is substituted, and the frequency is 350~600 beats/min, accompanied by absolute irregularity of ventricular rate, it may be atrial fibrillation. If necessary, choose amiodarone, metoprolol and other drugs to revive and control ventricular rate treatment. 4. Paroxysmal supraventricular tachycardia: the main appearance of retrograde P wave, but the QRS wave group morphology is normal, at this time the heart rate is between 150~250 beats/min. If necessary, choose verapamil, cediran and other drugs to treat. 5. Ventricular tachycardia: Usually, ventricular pre-systole will appear QRS wave group in advance, and there is no P wave in front of it, at the same time, the QRS wave group is wide and abnormal, you can follow the doctor’s advice to choose metoprolol, propafenone and other drugs. If any abnormality is found during ECG examination, it is recommended to consult the doctor in time to clarify the cause of the disease and standardize the treatment if necessary.