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The Journal of Thoracic and Cardiovascular Surgery, Vol 75, 625-631, Copyright © 1978 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

The internal mammary bypass graft: a superior second coronary artery

JW Jones, JL Ochsner, NL Mills and L Hughes

In a study of the initial 1,004 consecutive patients who had direct coronary artery bypass at Ochsner Medical Institutions, computer methods of data processing were used to compare the clinical results between patients who had saphenous vein (SV) grafts and those who had internal mammary artery (IMA) grafts. The factors compared were the long-term mortality rates, nonfatal myocardial infarction rates, relief or persistence of angina, and the percentage of patients who acquired congestive heart failure. A simple comparison showed the patients with IMA grafts did better in all four categories; however, in a subsequent analysis in which maldistributed factors were removed, the rates of anginal relief and congestive heart failure were not significantly improved. The major benefit appears to be an increase in longevity among patients who had IMA bypasses.




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