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see arrhythmiaarrhythmia
, disturbance in the rate or rhythm of the heartbeat. Various arrhythmias can be symptoms of serious heart disorders; however, they are usually of no medical significance except in the presence of additional symptoms.
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decrease in frequency of heart contractions to less than 60 beats per minute.

Bradycardia may be found as a normal, constitutionally conditioned phenomenon in perfectly healthy persons, in well-trained athletes, and as one of the symptoms in many diseases. More often, bradycardia is observed as a result of organic disturbances of auriculoventricular conductivity—heart blockage, myocardial infarction, and inflammatory (infectious or toxic) diseases of the heart muscle. Complete blockage of the heart with a pulse frequency of 30–40 beats per minute or less threatens brain complications: loss of consciousness, convulsions, and cessation of heart activity. Prophylaxis and treatment are directed toward removal of the cause.


Slow heart rate.
References in periodicals archive ?
One hour into the procedure, after a brief pause in surgery, with resumption of the surgical stimulus the patient suddenly became bradycardic.
ATPace is being developed as a therapeutic drug for the acute management of paroxysmal supraventricular tachycardia (PSVT) as well as a diagnostic test for the identification of patients with bradycardic (slow heart rate) syncope who may benefit from pacemaker therapy.
At the end of the procedure TURP syndrome was suspected when the patient became confused, bradycardic and hypotensive.
Influence of nCPAP therapy on bradycardic arrhythmias in sleep apnea].
In contrast with PbTx-3, single-dose injections of PbTx-1 resulted in a delayed bradycardic response on day 6 (Figure 5).
Both the hypotensive and bradycardic effects of EOMV became significant at 1 mg/kg body wt.
She was given lorazepam and 100% oxygen via nonrebreathing mask; she soon became bradycardic, diaphoretic, apneic, and pulseless.
Our findings suggest that rat calcitonin may induce a modest bradycardic effect and we do not conclude that rat calcitonin may induce a physiologically relevant negative chronotropic effect especially on human.
The bradycardic effect of ATP, in particular its blockade of atrio-ventricular (AV) nodal conduction, has been shown in multiple published clinical studies to safely and effectively terminate re-entrant PSVT involving the AV node.
46,49) Theoretically, huperzine A may exacerbate bradycardic heart arrhythmia, seizure disorder, chronic obstructive pulmonary disease, or peptic ulcer disease.
There are, of course, clinical situations in which the sympatholytic or bradycardic actions of [[alpha].
While preparations were made for a second urgent surgical intervention, a hemorrhagic flow drained from the mediastinal tube and the patient became hypotensive and bradycardic.