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Bradycardia |
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bradycardia: see arrhythmia arrhythmia , 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.
..... Click the link for more information. . bradycardia [¦brād·i¦kärd·ē·ə] (medicine) Slow heart rate. Bradycardia 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. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | The AHA recommends the QT interval should be measured in patients who have received any antiarrhythmic drug known to cause TdP, overdosed from a potentially proarrhythmic agent, developed new-onset bradyarrhythmias, severe hypokalemia or hypomagnesemia, require antipsychotics, and experienced an acute neurological event (Drew, 2005). This observation is consistent with previous reports: female patients have a longer QT interval than male patients (41), they have more pronounced QT prolongation when challenged with potassium channel blockers (42), and they are at a higher risk for developing drug-induced TdP when treated with antiarrhythmic drugs or during spontaneous bradyarrhythmias (6). Cardiovascular toxicity manifests as atrioventricular (AV) block, bradyarrhythmias, asystole, ventricular fibrillation, hypotension, and ultimately cardiac arrest. |
Bradyarrhythmias |
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