[Chromotopography of ventricular depolarization in northern reindeer].

With the aid of intramural multipolar technique, the sequence of the heart ventricles depolarization was studied in deer. Electric potentials were led from 1500-1700 points in the myocardium. Primary foci of excitation were revealed in the subendocardium of the caudal and cranial areas of the middle third of left and cranial portions of the upper third of right side of the interventricle partition. Within 5-10 msec. the ventricles subendocardium is wholly involved into the wave of depolarization. For 10-20 msec., the main lot of free walls, the central and upper portions of the partition, are excited. This period is characterized by spreading of the depolarization wave from numerous foci of excitation in all directions. Last the upper portions of the pulmonary artery output cone (40-45 msec.) and portions of the interventricle partition adjacent to the ventricles basis (45-50 msec.), become excited.