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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 ?
b) The averaged regression lines for [DELTA]HR/[DELTA]MAP for the PE-induced bradycardic baroreflex for C57 (n = 8) and SOD1 (n = 8).
The bradycardic (heart rate slowing) effect of ATP, in particular its transient blockade of atrio-ventricular nodal conduction, has been shown in multiple published clinical studies to terminate re-entrant PSVT involving the atrio-ventricular node.
These events are distinguished from each another in that vasovagal patients will be bradycardic and patients in shock will be tachycardic.
At the time of delivery the baby may be bradycardic or may have hypo- glycemia, but we can deal with that very easily.
At the time of delivery the baby may be bradycardic or may have hypoglycemia, but we can deal with that very easily.
One nurse commented that infants with a low tolerance of handling could desaturate or become bradycardic.
She became hypotensive, bradycardic, and drowsy after her first dose of lofexidine, and her QT/QTc increased to 612/601 ms.
The hypotensive and bradycardic responses evoked by OEMV were attenuated and blocked by pre-treatment of the animals with atropine (2 mg [kg.
It was noted at the scene that his pupils were fixed and dilated, he was not spontaneously breathing, and he was bradycardic.
The patient was febrile, bradycardic, hypotensive, edematous, and markedly jaundiced.
Several patients were bradycardic when receiving timolol, which may contribute to the reduced exercise tolerance found with topical timolol [9] as well as the development of heart failure.