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you are talking about something in a movie like it is real. isn't this just fiction?I believe in some cases barbiturates are used to induce a coma thereby reducing brain activity.
Well, I'm not a physician, the few times I've been around the ER they usually treat the symptoms. So drugs for tachycardia, beta blockers. Unconscious patients are difficult, you have to test to rule out what might have caused the symptoms, for example, illicit drug use.
The action of beta blockers reduces cardiac force so that the palpitations go more unnoticed, but there is no direct relationship between taking beta blockers and the actual inhibition of the ectopic beats. The palpitations in this case are occurring as a consequence of pneumogastric nerve stimulation (the vagus nerve at the level of the intestines) and subsequently causes random evoked potentials to excite the heart.