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atrial arrhythmiaCardiology Any irregularity in rate and rhythm which arises in the atrium
A disturbance in cardiac rhythm, including atrial fibrillation, atrial flutter, multifocal atrial tachycardia, paroxysmal supraventricular tachycardia, and premature atrial contractions.
See also: arrhythmia
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.