心电图的临床应用。心电图主要反映心脏激动的电学活动，因此对各种心律失常和传导障碍的诊断分析具有肯定价值，到目前为止尚没有其他方法能替代心电图在这方面的作用。特征性的心电图改变和演变是诊断心肌梗死可靠而实用的方法。房室肥大，心肌受损和心肌缺血，药物和电解质紊乱都可以引起一定的心电图变化，有助诊断。心脏电生理检查时，常需要对体表心电图进行同步描记，帮助判断电生理现象和辅助诊断。对于瓣膜活动，心音变化，

The clinical application of electrocardiogram (ECG)

ECG mainly reflects the electrical activity of cardiac reactions, thus it plays a positive role in the diagnosis of all kinds of arrhythmia and obstructed conductions. So far, there is no other method which can replace ECG's role in this regard. The characteristic changes and evolution revealed in ECG form a reliable and practical method in the diagnosis of myocardial infarction. Certain ECG changes can be attributed to heart hypertrophy, myocardial damage and myocardial ischemia, drug influence and electrolyte imbalance, which is helpful in the diagnosis. When we carry out a cardiac electrophysiology inspection, we often need to synchronize the monitor of surface ECG, so as to help determine electrophysiologic phenomena and facilitate the diagnosis. As to the valve activity, cardiac sounds changes......