in 27 dogs , the sinus rhythm and ectopic atrial rhythms induced with bipolar epicardiac atrial pace-maker , were studied on the basis of analysis of high amplitude atrial complex in augmented ( 150-250 ) filtered ( 30 divided by 110 hz ) ecg , intraatrial ecg in open heart , and the p wave of the ecg from the body surface .
C0018792
atrial
C0018787
heart