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cardiac arrhythmia |
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Cardiac arrhythmia An irregular heart rate or rhythm. Mentioned in: Holter Monitoring, Stress Test cardiac arrhythmia Etymology: Gk, kardia + a + rhythmos, without rhythm an abnormal cardiac rate or rhythm. The condition is caused by a failure of the sinus node to maintain its pacemaker function or by a defect in the electrical conduction system. Examples of arrhythmia include bradycardia, ectopic beat, heart block, and tachycardia. arrhythmia variation from the normal rhythm, especially of the heartbeat. See also bradycardia, tachycardia. atrial arrhythmia see atrial flutter, atrial fibrillation. bradycardic arrhythmia see bradyarrhythmia. benign arrhythmia one which is clinically insignificant. cardiac arrhythmia irregularity of the normal heart rhythm, either in frequency or amplitude, or almost always both. exercise-induced arrhythmia a cause of poor racing performance or sudden death while racing; detectable only by telemetered electrocardiography. sinus arrhythmia the physiological cyclic variation in heart rate related to vagal impulses to the sinoatrial node. supraventricular a's ventricular a's cardiac arrhythmia Cardiology Any defect in the heart's electrical activity, which may be detectable only by EKG, or manifest as an abnormality in rate, rhythm, or sequence of cardiac events Clinical From asymptomatic to
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Air pollution and cardiac arrhythmias in patients with implantable cardioverter defibrillators. While doctors, pharmacologists, lactation consultants, and breastfeeding mothers who advocate its use claim it is safe, the FDA cites in its warning "several published reports and case studies of cardiac arrhythmias, cardiac arrest, and sudden death in patients receiving an intravenous form of domperidone. Because ion channels are involved in cardiac arrhythmias and many diseases, such as muscular dystrophy, compounds that mimic the activity of these venom peptides could serve as potential drugs. |
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