Remember, beginners should never get caught in an ECG. It's easy to see an electrocardiogram, and it's painful to explain the principle. This is everyone's experience. It is very important to recognize ECG. In fact, it is very simple to look at ECG, and every ECG feature is the most important feature, so we should grasp the most important point. For example, the main feature of ventricular rhythm is wide QRS wave, which is immediately confirmed as ventricular rhythm when it is seen. Other details, such as the absence of P wave, are not significant and specific. For example, myocardial infarction, the most specific is st segment abnormality. In order to distinguish whether there is such a strange ECG at ordinary times, it is necessary to review the ECG within a few hours. If it is a dynamic change, it may be a myocardial infarction. In addition, go to the clinic and know which ECG is important. For example, sinus arrhythmia doesn't matter and doesn't need to be treated. For truly critical ventricular arrhythmia, it is necessary to master rapid judgment, and then know the ECG changes of myocardial infarction and myocardial ischemia, followed by atrial fibrillation, atrioventricular block, preexcitation syndrome and left bundle branch block. Knowing these basics is OK!