We studied the effect of ischemia and reperfusion on the total antioxidant capacity (TAC) of blood plasma during cardiopulmonary bypass surgery employing the modified St. Thomas Hospital cardioplegic solution. TAC was determined using the FRAP method. TAC decreased during surgery, but no further decrease in TAC was observed during reperfusion, indicating that it is a relatively stable parameter of the antioxidative barrier of the body.
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