? reversible causes: Inapproriate sinus tachycardia typically signals in imbalance in the sympathetic nervous signals --the "fight or flight" reflex. It is a sinus rate that is excessive without provocation. It is important to make sure that reversible causes of sympathetic nerve stimulation are ruled out--such as dehydration, anmia, excessive thyroid hormone, anxiety. Beta blockers first. Clonidine might help too.
Answered 3/1/2019
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