Definition: three or more consecutive impulses at a rate not exceeding the upper limit of the inherent pacemaker; extreme range of impulse formation at the sinoatrial node is between 40 and 180 impulses per minute, that of the atrioventricular junction is normally 40–60 impulses per min, and the normal rate of the ventricular myocardium (idioventricular rhythm) is 20–40 impulses per min.
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