Effect of unilateral stellate ganglion blockade and stimulation on experimental arrhythmias.

Arterior descending branch of coronary was occluded in 33 mongre I dogs under alpha-chloralose (80-100 mglkg iv). Nineteen animals exhibiting spontaneous ventriculiH ectopics with in half an hour of occlusion comprised Group I. while the remaining 14 animals unattended by ventricular ectopics were included in Group. II. Ten animals of Group I were subjected to left stellate ganglion blockade (LSGS) by cooling. This resulted in complete mitigation d arrhythmias. The ventricular ectopics were reprllcipitated pn revit'llising the left stellate ganglion with warm water in seven of these ten animals. In other five animals of Group I mitigation of arrhythmias by LSGB and reprecipitation by right stellate ganglion blockade (RSGS) could be successfully alternated for two consecutive trials. The remaining four animals passed into ventricu lar fibrillation (v. F.) before any interventiqn by LSGB could be attempted.