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| arrhythmia |
any abnormality in the rhythm or strength of the heartbeat. |
| beta blocker |
any of a class of drugs that inhibit the absorption of adrenalin and the activity of the autonomic nervous system, and are used to control the heartbeat and relieve angina and hypertension. |
| biofeedback |
a method for self-regulation of presumably involuntary bodily functions, such as heartbeat rate, with the aid of electronic monitors that display visual representations of such functions. |
| cardioversion |
application of an electric shock to restore heartbeat. |
| depressor |
a nerve that decreases blood pressure and heartbeat when stimulated. [1/3 definitions] |
| heart block |
a disorder in the coordination of the heartbeat, resulting in the atria and ventricles contracting independently of each other. |
| lidocaine |
a synthetic crystalline compound used as a local anesthetic and in controlling an erratic heartbeat. |
| murmur |
an irregularity in the heartbeat, caused by incomplete closure of heart valves; heart murmur. [1/6 definitions] |
| polygraph |
a device that records changes in bodily functions such as respiration rate, heartbeat, and blood pressure, sometimes used during interrogation of suspected criminals; lie detector. |
| sympathetic |
in vertebrates, designating that part of the autonomic nervous system which is responsible for accelerating the heartbeat, decreasing digestive activity, and other actions. (Cf. parasympathetic.) [1/5 definitions] |
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