Experimental study on cardiac resuscitation--effectiveness of thoracic aorta occlusion
Suzuki, A.; Taki, K.; Takeshima, N.
Masui. Japanese Journal of Anesthesiology 29(7): 677-682
1980
ISSN/ISBN: 0021-4892 PMID: 7411846 Document Number: 167706
Carotid and coronary blood flow was increased during open-chest cardiac massage by temporary occlusion of the thoracic aorta. In 9 dogs cardiac arrest was induced by apnea with muscle relaxants and open-chest cardiac massage was instituted. During cardiac massage carotid arterial pressure by arterial cannula and carotid flow by electromagnetic flow meter was measured continuously. In 3 occasions cardiac output was measured by thermodilution method using Swan-Ganz catheter. During open-chest cardiac massage occlusion of the thoracic aorta resulted in increase of carotid pressure from 56/20 to 86/27 mm Hg and carotid flow doubled. Cardiac output increased 41% by aortic occlusion. Increased venous return to the heart by the occlusion of the thoracic aorta is observed. In 15 dogs the effectiveness of the thoracic aorta occlusion was compared with routine open chest cardiac massage. Following 5 min of apnea the routine open-chest cardiac massage resumed spontaneous cardiac rhythm in all 5 dogs, but following 10 min of apnea routine cardiac massage resumed spontaneous cardiac rhythm in 1 of 3 dogs. Cardiac massage with the thoracic aorta occlusion resumed cardiac rhythm in all 3 dogs after 10 min of apnea. Temporary occlusion of the thoracic aorta during open-chest cardiac massage is an effective technic of cardiac resuscitation.