Premature beats themselves may have certain effects. In addition to the discomfort they may cause, in severe cases they may lead to hemodynamic changes or trigger more serious arrhythmias, such as ventricular tachycardia or ventricular fibrillation. However, the risk of premature beats depends mainly on the presence of organic lesions and the state of the heart, as well as on the number of premature beats per 24 hours, the shape of the beats, and whether there are multiple abnormal pacing points. Generally speaking, if the heart is normal, even if there are more premature beats, they will not affect the heart too much and should only be observed and followed up. However, it is different for people with underlying heart disease. For example, premature atrial beats in mitral valve lesions can easily develop into atrial fibrillation, but in general, premature atrial beats are not fatal; whereas in patients with acute myocardial infarction, hypokalemia or severe heart failure, premature ventricular beats may cause ventricular tachycardia, aggravate heart failure or even ventricular fibrillation, and in severe cases, may lead to sudden cardiac death, especially in patients with acute myocardial infarction in coronary artery disease. Of course, this is only a minority of cases, so it is not necessary to talk about premature beats. Therefore, a risk stratification or assessment of the heart status is needed to help determine the risk of premature beats.