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Table 1 Classification of syncope

From: Laugh syncope as a rare sub-type of the situational syncopes: a case report

Cardiac
Aortic stenosis, hypertrophic cardiomyopathy, pulmonary embolism, aortic dissection, myocardial infarction, left atrial myxoma, cardiac tamponade, atrioventricular block, sick sinus syndrome, tachyarrhythmia, bradyarrhythmia
Neurally mediated (reflex mechanisms)
Vasovagal, situational (micturition, laughter, tussive, defecation, postprandial, sneeze, swallow), orthostatic syncope, carotid sinus syncope
Neurologic
Transient ischemic attack, subclavian steal syndrome, Takayasu disease, seizure
Metabolic
Hypoxia, hypoglycemia, hyperventilation
Psychiatric
Panic disorder, conversion reaction, hysteria
Drug-induced
Vasodilators (nitrates, calcium channel blockers, angiotensin-converting enzyme inhibitors), phenothiazines, antidepressants (tricyclic agents, monoamine oxidase inhibitors), central nervous system depressants (barbiturates), drugs associated with torsades de pointes (quinidine, procainamide, disopyramide, amiodarone, sotalol, flecainide), diuretics, digitalis, insulin, marijuana, alcohol, cocaine
Unknown origin