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Ann Thorac Surg 2003;76:41-45
© 2003 The Society of Thoracic Surgeons
a Department of Cardiothoracic Surgery, Liverpool, United Kingdom
b Department of Research and Development, The Cardiothoracic Centre, Liverpool, United Kingdom
Accepted for publication January 17, 2003.
* Address reprint requests to Mr Dihmis, Consultant Cardiac Surgeon, The Cardiothoracic Centre-Liverpool, Thomas Drive, Liverpool L14 3PE, United Kingdom.
e-mail: wdihmis{at}ccl-tr.nwest.nhs.uk
BACKGROUND: The effect of preoperative aspirin use until the day of operation on mortality rate and bleeding risks in patients who had on-pump coronary artery bypass operation has been well documented. However, the effect of aspirin use in patients undergoing off-pump coronary artery bypass operation (OPCAB) with regard to postoperative blood loss and morbidity has not been studied. We aimed to determine the effects of continuing aspirin therapy preoperatively.
METHODS: We performed a retrospective study of 340 patients who had first-time OPCAB between January 1998 and September 2001. A propensity score for receiving aspirin until the day of operation was constructed from core patient characteristics. All aspirin users (n = 170) were matched with unique 170 nonaspirin users by identical propensity score. The primary outcome measures were in-hospital mortality rate and hemorrhage-related outcomes (postoperative blood loss in the intensive care unit, reexploration for bleeding, and blood product requirements). Secondary outcome measures were stroke, myocardial infarction, gastrointestinal bleeding, and sternal wound infections.
RESULTS: There were no differences in patient characteristics between aspirin users and nonaspirin users. The average postoperative blood loss (845 mL versus 775 mL; p = 0.157) and the rate of reexploration for bleeding (3.5% versus 3.5%; p > 0.99) were similar in aspirin users and nonaspirin users. We found no significant difference between blood product requirements for the two groups. Similarly, we found no significant difference in the incidence of the secondary outcomes.
CONCLUSIONS: Preoperative aspirin did not increase bleeding-related complications, mortality rate, or other morbidities in patients who had off-pump coronary artery operation.
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