Table 1. Causes of syncope according to underlying pathophysiology.

Neurally-mediated	Orthostatic/dysautonomic	Arrhythmic	Structural cardiovascular	Mimickers of syncope
Vasovagal	Hypovolemia	Ventricular tachycardia	Aortic stenosis	Stroke, transient ischemic attack
Vasodepressor	Medications	Torsades de pointes	Aortic dissection	Seizures
Carotid sinus hypersensitivity	Postprandial	Supraventricular tachycardia	Hypertrophic cardiomyopathy	Migraine
Post-micturition, defecation	Parkinson's Disease	Atrial fibrillation and flutter	Pulmonary hypertension	Narcolepsy
Post-cough	Diabetic/other neuropathies	Sick sinus syndrome	Atrial myxoma	Panic attacks
Post-laugh,	Amyloid	Atrioventricular block	Pulmonary embolism	Conversion disorder
Post-exercise	Spinal cord disease	Pacemaker syndrome	Subclavian steal	Concussion