When an elderly person faints and then wakes up on his own, he is considered to have a syncopal episode. The causes of syncopal episodes are mainly considered in the following aspects: First, it may be vasovagal syncope, or situational syncope, or carotid sinus syncope, which can lead to reflex syncope due to a further decrease in blood pressure based on a slowed heart rate, resulting in a transient deficiency of blood supply to the brain. The second aspect is that it may be caused by insufficient blood volume, such as when the patient is suffering from diarrhea, nausea, vomiting, poor feeding, etc., which may lead to insufficient blood volume. The third and more important cause of syncope is cardiogenic syncope, such as syncope caused by arrhythmia, bradycardia, abnormal sinus node function, tachycardia, supraventricular tachycardia, or syncope caused by organic cardiovascular diseases, such as heart valve disease, pericardial disease, etc.