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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]