Abstract
Using a calcium-specific electrode, the changes in serum calcium level during and after the perfusion in the cardiac surgery were followed. Changes in the total calcium were observed in the patients perfused with and without calcium gluconate in the initial prime solution and were parallel with those of total serum protein. The level of ionized calcium was kept unchanged in the patients perfused with calcium gluconate, even though the serum pH and the PTH level changed during the perfusion. The effect of body temperature on calcium level was not observed as checked under the conditions of hypothermia and normothermia. Large amounts of calcium and phosphate were excreted into the urine when diuretics were used, which might be a cause of hypocalcemia during perfusion.
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