Abernathy's Surgical Secrets

1.355 hal.; ill.; 22.8 c

Regional Myocardial Temperature Variations with Asanguineous Potassium Cardioplegia

(J. Extra-Corpor. Technol. 19( 4) pp. 415-419 Winter 1987,) The temperature of the myocardium during cardioplegic arrest is an indication of the extent to which that area has received both hypothermic and chemical protection. Regional myocardial temperatures were examined during asanguineous cardioplegic arrest to assess differences in temperatures, examine regional rates of rewarming, and to identify maximum temperature gradients. Myocardial temperatures were measured at the left ventricular apex, the right ventricular free wall and the interventricular septum in twenty patients undergoing coronary artery bypass using multidose asanguineous cardioplegic arrest. Aortic root temperatures were measured to identify the temperature of the cardioplegia and left heart blood temperatures during venting. Temperatures in the left ventricular apex ranged from 13.9° to 21.3°, right ventricular free wall from 15.9° to 21.9°, and the interventricular septum from 13° to 23.6°. Temperature variations in the three areas were as great as 15 ° and as little as 2 °. Myocardial temperatures are 1) not predictable due to the nature of coronary artery disease, 2) variable despite optimal delivery technique, and 3) may vary due to cannulation and systemic blood temperature