This ectopic focus becomes the predominant pacemaker of the heart. When the atrial rate is greater than 100 beats per minute, the rhythm is atrial tachycardia. If less than 100 beats per minute ...

Prematurity of an ectopy is determined by the intrinsic escape rhythm of the ectopic focus ... if the risk for potential aggravating cardiac effects due to the experimental conditions or suspected ...

The second ECG strip below shows an ectopic atrial rhythm. Note that the P wave is down in lead II and only up (not biphasic) in lead V1. If there is sinus rhythm, and the heart rate is less than ...