Increased resting HR: Various conditions can alter resting heart rate- acute or chronic illness, inflammation, hydration status, anemia, thyroid conditions, deconditioning-- just to name a few. Given a sudden increase in HR with positional change, one would initially consider a decreased intravascular volume ("dehydration"), especially if recent. May consider increasing fluid intake. If no change, may need evaluation.
Answered 5/2/2017
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