The deleterious effects of cardiac arrest induced by potassium salts, acetylcholine, or anoxia have been demonstrated by several investigators.2,7,8,12-14,20,21 The mechanism of damage to the myocardium remains uncertain, but it may well be associated with a disparity between the amount of available oxygen and the metabolic needs of the heart for oxygen under normothermic conditions. Although the oxygen consumption of the normothermic, nonbeating heart is reduced below that of the beating, nonworking heart,22 a definite oxygen need persists. This oxygen need of the myocardium may be still further reduced by hypothermia,4 which reduces the oxygen needs of most body tissues.1,19
Since profound hypothermia of itself will cause cardiac arrest, it is natural that a variety of hypothermic techniques have been employed to secure a quiet, bloodless heart for experimental or clinical open cardiac surgery. There has been no definitive study of the relative advantages of these
WILLMAN VL, HOWARD HS, COOPER T, HANLON CR. Ventricular Function After Hypothermic Cardiac Arrest. Arch Surg. 1961;82(1):120–127. doi:10.1001/archsurg.1961.01300070124015
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