Off-pump Bilateral Skeletonized Internal Thoracic Artery Grafting in Elderly Patients

Abstract

The purpose of the present study was to compare outcome in propensity score-matched patients, aged 70 years or greater, undergoing isolated off-pump coronary bypass surgery using a bilateral (BITA) or single (SITA) skeletonized internal thoracic artery. Of 912 consecutive patients undergoing isolated coronary bypass grafting (906 using the off-pump technique without emergent conversion to cardiopulmonary bypass), the 491 aged 70 years or greater undergoing off-pump skeletonized single (n=247) or bilateral (n=244) skeletonized internal thoracic artery grafting were retrospectively analyzed after excluding the 6 who were transferred to our hospital after receiving percutaneous cardiopulmonary bypass, the 72 who had only 1 target in the left coronary area, and the 343 aged less than 70 years. A total of 217 pairs were matched using propensity scores calculated from 9 preoperative factors (0.69). The rate of postoperative complications was similar between the groups. The 5-year estimated survival free from overall death and cardiac event, respectively, in the BITA group versus the SITA group were 86.4%±3.2% versus 73.5%±3.9% (p=0.01) and 93.2%±2.7% versus 87.5%±3.0% (p=0.01). In multivariate Cox models, bilateral internal thoracic artery grafting was significantly associated with a lower risk of overall death (hazard ratio 0.56; 95% confidence interval 0.31 to 0.99; p=0.04) and cardiac event (hazard ratio 0.36; 95% confidence interval 0.15 to 0.88; p=0.03). In elderly patients, off-pump in situ left-sided bilateral skeletonized internal thoracic artery grafting is associated with lower risk of overall death and cardiac event than single internal thoracic artery grafting and carries no increased operative risk.