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any abnormality in the rate, regularity, or sequence of cardiac activation.
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.
cardiac arrhythmiaCardiology 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 palpitations, syncope, etc
car·di·ac dys·rhyth·mi·a(kahr'dē-ak dis-ridh'mē-ă)
Any abnormality in the rate, regularity, or sequence of cardiac activation.
An irregular heart rate or rhythm.
one which is clinically insignificant.
irregularity of the normal heart rhythm, either in frequency or amplitude, or almost always both.
a cause of poor racing performance or sudden death while racing; detectable only by telemetered electrocardiography.
the physiological cyclic variation in heart rate related to vagal impulses to the sinoatrial node.