Causes of syncope in pooled data from five population-based studies

Cause	Mean prevalence, percent
Neurally mediated
Vasovagal	18
Situational (eg, cough, micturition, defecation, swallow)	5
Carotid sinus syncope	1
Orthostatic hypotension	8
Medications	3
Psychiatric	2
Neurologic	10
Cardiac
Organic heart disease	4
Arrhythmia	14
Unknown	34

Prevalence_of_syncope_I.htm

Data from Linzer M, Yang EH, Estes M, et al. Ann Intern Med 1997; 126:989. Includes 1002 unselected patients with syncope, including those from hospital-based referrals, emergency departements, and outpatient clinics between 1984 and 1990.

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