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Encyclopedia of Health and Medicine

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syncope 109<br />

Other causes <strong>of</strong> syncope include neurologic<br />

events (such as vasovagal response), medication<br />

side effects, heat, DEHYDRATION, fear, FEVER, <strong>and</strong><br />

PREGNANCY. Most people regain consciousness<br />

within a few seconds to three minutes. Syncope<br />

may be an isolated event or a symptom <strong>of</strong> underlying<br />

health concerns. A doctor should evaluate<br />

recurrent episodes <strong>of</strong> syncope. Such an evaluation<br />

typically includes a NEUROLOGIC EXAMINATION <strong>and</strong> an<br />

ELECTROCARDIOGRAM (ECG).<br />

See also ADVERSE REACTION; CRANIAL NERVES; GAS-<br />

TROPARESIS; SEIZURE DISORDERS; UNCONSCIOUSNESS.

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