| Abstract | Surgeons are constantly balancing good operating conditions with a still relaxed but ischemic heart against the demands of myocardial preservation. We have, for the last ten years, used cardioplegia for all cardiac surgery. 「1. COMPONENTS OF CARDIOPLEGIC PROTECTION. 」The essential components of cardioplegic myocardial protection are hypothermia, asystole, and the additional protection available from a properly formulated solution. To achieve these aims it is necessary to consider the cardiopulmonary bypass technique, the cardioplegic solution, the infusion mechanism and the maintenance of hypothermia. 「2. CRADIOPULMONARY BYPASS TECHNIQUE」Taking first the cardiopulmonary bypass technique, we have to consider flow and temperature. Bypass is begun with the standard flow of 2.4l/min/m2 until the temperature has reached around 30℃ when the aorta is occluded, at which point the flow rate is reduced to 1.5l/min/m2 in order to reduce the flow in the non-coronary collaterals into the myocardium. |
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