idiopathic orthostatic hypotension

id·i·o·path·ic or·tho·stat·ic hy·po·ten·sion

the tendency for blood pressure to drop for unknown reasons on assuming upright posture.
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References in periodicals archive ?
In order to determine how regional cerebral blood flow would change during standing position in patients with idiopathic orthostatic hypotension, Tc-99m HMPAO SPECT studies were performed during postural testing in five patients.
The correlation between symptoms and signs associated with hypotension and its changes in the brain perfusion was reported in a 78-year-old right-handed man with idiopathic orthostatic hypotension who presented episodes of recurrent stereotyped attacks of bilateral limb shaking and metamorphopsia, which were precipitated by standing for more than 3 or 4 minutes, or walking a few meters.

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