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postural syncope in Medicine

postural syncope

n.
  1. 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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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