Intraoperative delineation of the coronary anatomy during coronary bypass operations is critical for suc cessful revascularization. Two tech niques utilizing fluorescein to en hance the visualization of the coro nary arteries were evaluated in a ca nine model. A previously described method using fluorescent cardiople gia to arrest the heart produced sub- optimal contrast. Excellent visualiza tion of the coronary circulation was obtained when the heart was arrested with crystalline cardioplegia and then reinjected with fluorescein cardiople gia.
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