Risk assessment following syncope - McMaster Textbook of Internal Medicine

Table 1.5-3. Risk assessment following syncope
Risk factors	Comments
Major risk factors
Abnormal ECG	Any bradyarrhythmia, tachyarrhythmia, conduction disorder, ischemia, or history of myocardial infarction
History of cardiac disease	Ischemic, arrhythmic, obstructive, valvular
Hypotension	SBP <90 mm Hg
Minor risk factors
Cerebrovascular disease
Family history of sudden cardiac death	At age <50 years
Specific situations	Syncope while supine or during exercise, or no prodromal symptoms
ECG, electrocardiography; SBP, systolic blood pressure.