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We hypothesized that cardiovascular performance during the first 24 postoperative hours would be better in patients after off pump coronary artery bypass grafting compared to conventional on pump surgery. Fifty-nine patients were randomized to on or off pump coronary artery bypass grafting. Hemodynamic parameters, including cardiac index and systemic vascular resistance index were measured before and at 1, 4, and 20 h after surgery. Troponin T and creatine kinase-MB (CK-MB) were measured before and at 1, 6, and 20 h after surgery. There was no difference in age, sex, ejection fraction or number of grafts between groups. Cardiac index was higher (p=0.05) and systemic vascular resistance index was lower (p=0.007) in the off pump group 1 h after arrival in the intensive care unit. CK-MB and troponin T were significantly lower in the off pump group after 1 h (CK-MB p&lt;0.001, troponin T p&lt;0.001) and after 6 h (CK-MB p=0.02, troponin T p&lt;0.001). After 24 h there was no difference between the two groups. In conclusion, immediately after surgery there was better cardiovascular performance and less release of markers of myocardial damage after off pump coronary surgery. After 24 h all differences were eliminated.

Cardiovascular function during the first 24 hours after off pump coronary artery bypass grafting–a prospective, randomized study