Changes in the EKG in occlusion of the abdominal aorta

Summary

The occulusion of the aorta above the bifurcation for 30 min caused a slowing down of the cardiac rhythm in rabbits, with an increase of the R wave amplitude, flattening of the T wave and at times a downward shift of the S-T interval; after a temporary occlusion of the aorta the changes of the cardiac activity continued for about 20 days. The occlusion, of the abdominal aorta in the vagotomized animals and in rabbits to, which hexamethonium was preliminarily administered caused but mild EKG changes. Placing upon the aorta of the “irritating” ligature (with the least possible stenosis) provoked bradycardia, a slight increase of the R wave and flattening of the T wave.