Comparison of SA nodal and subsidiary atrial pacemaker function and location in the dog.

摘要: A 3-4 cm length of sulcus terminalis tissue including the sinoatrial node (SAN) was excised from 14 dogs. After an initial junctional rhythm with SAN excision a P wave emerged within days to weeks in 12 animals. Maximum heart rates (preoperative) response exercise (276 +/- 15 beats/min), isoproterenol infusion conscious animals (272 11 and stellate stimulation during anesthesia (273 9 beats/min) were significantly greater than subsidiary pacemakers (postoperatively) for (219 (226 8 (197 beats/min). During final experiment, electrophysiological mapping area earliest epicardial activation (pacemaker location) carried out. By use suction electrode reference plunge electrodes located anterior interatrial band (AIB), eustachian ridge coronary sinus, limbus fossa ovalis, pacemaker at inferior vena cava-inferior right atrial junction 80% mapped. foci shifted regions AIB 70% The concept hierarchy is discussed.