Abstract：Syncope is a common symptom caused by transient global cerebral hypoperfusion due to decreased peripheral vascular resistance and/or decreased cardiac output. Cardiogenic syncope is the most dangerous type of syncope, and its mortality rate is double that of other syncopes. Arrhythmias are the most common causes of cardiac syncope. Both bradyarrhythmias and tachyarrhythmias may predispose to syncope. The latest guidelines for syncope have been revised to focus on clinical history, physical examination, standing and supine Bp,12-lead echocardiogram and electrophysiological examination.
