A member asked:

What are the key differences between pots and ist?

A doctor has provided 1 answer

Basic differences...: POTS: Abnormally fast sinus rhythm at rest or minimal activity that accelerates beyond expectations and is out of proportion to physiologic necessity, not resulting from an explainable underlying cause. Diagnosed by exclusion. IST: Condition of orthostatic intolerance leading to abnormal increase in heart rate with change in position. Diagnosed with tilt table.

Answered 7/2/2015

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