A syncope that occurs upon assuming an upright position and is caused by inadequate blood flow to the brain resulting from failure of normal vasoconstrictive mechanisms.
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You may have read the word "simmer" in a recipe or two, but what does it really mean?
Words nearby postural syncope
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.