Question

Injection which is given to heart directly to increase the heart beat

Answer 1

In case of a medical emergency when the heart has stop beating, as an aid of last resort, adrenaline is injected directly into heart to stimulate it so that the heart may start beating again. It is called intracardiac route, adrenaline is injected directly in heart muscle through chest. The method is obsolete now a days.

Answer 2

Answer-
________
Nitroglycerin, this medication is used to treat chest pain and can help improve blood flow to the heart by widening the blood vessels.