Electrocardiography (ECG) requires exposure of the chest and removal of the upper garment if necessary. Properly performed ECG helps to assess the patient’s cardiac condition and guides clinical treatment. Electrocardiography is a commonly used clinical examination method, which is non-invasive, easy to operate and harmless to the human body, and is widely used in the clinic at present. When doing a routine 12-lead electrocardiogram, the electrocardiogram leads need to be connected to the patient’s chest as well as the hands, ankles, and feet and ankles, and the skin in these areas should be fully exposed; if the patient’s clothing is loose, it is not necessary to remove the upper garment, and it is sufficient to lift up the upper garment. If the patient’s clothing is too tight to expose the chest, the shirt needs to be removed; in addition, some patients need to undergo an 18-lead ECG examination to expose the skin on the back, and need to remove the shirt to cooperate with the examination. Electrocardiogram can reflect the electrical activity of the heart, suggesting whether the patient has arrhythmia, myocardial ischemia, atrial hypertrophy, ventricular hypertrophy, myocardial infarction and other diseases, which is conducive to the physician’s assessment of the patient’s condition, and to formulate an appropriate treatment plan.