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Related to bradyarrhythmia: bradycardia, brachycardia, sick sinus syndrome


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 ?
Bradyarrhythmias in patients with OSA are related to the apnoeic episodes and over 80% are found during REM sleep.
Relation of daytime bradyarrhythmias with high risk features of sleep apnea.
LD-induced bradyarrhythmias respond to intravenous antibiotic infusions.
Following intensive supportive care for metabolic acidosis, hypotensive shock, and bradyarrhythmia, her acidosis resolved, her blood pressure stabilized, and she became conscious.
Patients with severe bradyarrhythmia should not use this product; pregnant women should use it with caution.
Primary cardiac events were defined as pulmonary edema (documented on chest radiograph or by crackles heard over more than one-third of posterior lung fields), sustained symptomatic tachyarrhythmia or bradyarrhythmia requiring treatment, heart failure requiring treatment, endocarditis identified by standard criteria, thromboembolic phenomenon (stroke, pulmonary embolism, deep venous thrombosis, valve thrombosis), acute coronary syndrome, need for urgent invasive cardiac procedures during pregnancy or within 6 weeks after delivery, cardiac arrest or cardiac death.
When AChE is inhibited by an OP, it is unable to hydrolyze the neurotransmitter acetylcholine (ACh), which reaches toxic concentrations in the neural synapse, causing hyperstimutation of cholinergic receptors, resulting in tremors, lacrimation, and bradyarrhythmia and, if untreated, may become lethal (Costa 2006; Sultatos 1994).
During a restricted sensitive period, this results in induction of concentration-dependent bradyarrhythmia in the embryo and episodes of hypoxia/reoxygenation (Azarbayjani & Danielsson, 1998).