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Blood cardioplegia--a comparative clinical and laboratory study.

A prospective comparative study was undertaken to determine quality of myocardial preservation during open heart surgery by crystalloid and blood cardioplegic solutions. Total 55 consecutive patients were studied. Alternate patients received blood and crystalloid cardioplegia at random. Group I had 30 patients who received crystalloid cardioplegia, and group II, with 25 patients, received blood cardioplegia. The efficacy of two solutions was assessed by serum enzyme estimation of creatinine phosphokinase, M.B. fraction of creatinine phosphokinase and serum glutamate oxalate transferase (CPK, CPK-MB, SGOT), electron microscopic study of Left Ventricular biopsy and clinical assessment of post anoxic cardiac performance. Group II patients had lower serum enzyme levels, lesser microscopic myocardial damage, and better cardiac performance during immediate post-operative period, thus proving superiority of myocardial protection by blood cardioplegia.