Physiology Journal of Applied Physiology
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News Physiol Sci 4: 120-123, 1989;
1548-9213/89 $5.00
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News in Physiological Sciences, Vol 4, 120-123, Copyright © 1989 by International Union of Physiological Sciences

ARTICLES

Posthemorrhagic Syncope

J Ludbrook and R Evans

During acute blood loss, arterial pressure is at first maintained by widespread reflex vasoconstriction. Then, vasoconstriction fails abruptly and arterial pressure falls precipitately, despite massive vasopressin release. This decompensation can now be attributed to activation of an endogenous opioid mechanism in the brain by a signal from the heart.


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[Abstract] [Full Text]


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