Awareness of heart beating in sinus rhythm

This is experienced by most healthy subjects at some time. It usually occurs in relation to sympathetic nervous system overactivity, e.g. after strenuous exercise, when given a fright or waiting for an interview or examination. It may he most noticeable in bed at night when external visual and auditory inputs are minimal and visccral sensations more prominent. Similar palpitations occur with excessive caffeine intake in coffee, tea or other drinks. Caffeine (found in tea, coffee, cola, etc.) enhances the action of the sympathetic nervous system hy augmenting the concentration of relevant secondary messengers in the myocardium.

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