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The indications for surgical treatment by aortocoronary bypass have been considerably extended during the last few years as a result of experience in the clinical, hemodynamic and surgical fields. The mortality of the operation is about 4%. Important criteria are: 1. More than one coronary vessel must be affected. 2. The artery below the lesion must have a diameter of more than 1 mm. 3. The end-diastolic pressure in the left ventricle must be below 20 mm Hg. 4. The stroke volume fraction in the left ventricle must not be less than 0.40. 5. Serious intractable diseases must not be present.