Adrenergic stimulati: Abnormal and excessive secretion of catecholamines due to sympathetic nervous system stimulation secondary to changes in position (due to gravity effects on circulating intravascular volume). This unchecked catecholamine surge causes a stimulation of heart rate.
Answered 5/4/2015
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Unclear: The exact cause of pots is not known. One theory is that it occurs after a viral infection, even one that is very minor.
Answered 11/22/2014
5.3k views
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