More than 35,000 coronary bypass operations have been performed since 1967, when the surgical technique became generally known. But many doctors still question the long-term effectiveness of the operation, in which a vein is taken from a patient's leg and used to carry blood around an obstruction in the artery supplying the heart. Members of the surgical team that performed what was probably the first successful coronary bypass apparently believe the operation is effective. Drs. Michael DeBakey and Edward Dennis of Baylor College of Medicine in Houston and Dr. H. Edward Garrett, now at the University of Tennessee, report in the...
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