orthostatic intolerance
(redirected from cardiac phobia)orthostatic intolerance
A condition (OMIM:604715) characterised by lightheadedness, fatigue, altered mentation, syncope and tachycardia upon assuming an upright position, and markedly elevated serum norepinephrine.Molecular pathology
Defects in SLC6A2, which encodes a member of the sodium:neurotransmitter symporter that regulates norepinephrine homeostasis, are a cause of orthostatic intolerance.
or·tho·stat·ic in·tol·er·ance
(ōr'thō-stat'ik in-tol'ĕr-ăns)Decreased venous return in the upright position typically experienced by astronauts after returning to an environment subject to gravity.
orthostatic intolerance
Loss of consciousness, near fainting, or light-headedness occurring when a person stands up from a seated or resting position. It is caused by insufficient blood flow to the brain, typically brought on by inability to raise blood pressure during changes in posture.