Patients with syncope need to be hospitalized in two situations: need for a definitive diagnosis or need for hospitalization Timing of hospitalization for patients with syncope: I. For diagnostic purposes 1. suspected or already found to have heart disease; 2. suspected arrhythmic syncope with abnormal ECG; 3. syncope occurring during exercise; 4. syncope resulting in severe trauma; 5. family history of sudden death; 6. other rare situations requiring hospitalization: (1) patients without organic heart disease but with sudden, transient palpitations before syncope; (2) patients with recumbent syncope and frequent episodes; (3) patients with mild or moderate heart disease with high suspicion of cardiogenic syncope. Second, for therapeutic purposes 1, syncope caused by arrhythmia; 2, syncope caused by myocardial ischemia; 3, secondary to organic heart disease or cardiopulmonary disease; 4, stroke or neurological disorders; 5, cardiac suppression type neuroreflex syncope to be treated by pacemaker placement.