Changes in coronary bypass surgery leading to improved survival

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Abstract
Coronary bypass surgery was performed on 439 patients between 1969-1973 (group A) and on 1760 patients between 1974-1979 (group B). The operative mortality for group A was 3.9% and for group B, 1.3%; 4 yr survival for group A patients was 88.9 .+-. 1.5% (mean .+-. SE); for group B patients, 92.5 .+-. 0.9%. The difference between the relative 4 yr survival rates (based on age- and sex-matched Oregon population) between groups B and A was 6.2%; the lower operative mortality would account for only 2.6%. The results of coronary bypass surgery apparently have improved because of a lower operative mortality, and other factors cannot be precisely defined at the present time but probably are the long-term result of better and more complete operative and perioperative techniques.

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