Abstract 18519: Withdrawal of Antiplatelet Therapy Results in Worse Short-term Prognosis in Patients Undergoing Elective Major Noncardiac Surgery

Abstract

Background: The decision whether to discontinue antiplatelet therapy in patients undergoing major noncardiac surgery can be clinically challenging. There is insufficient clinical evidence to establish comprehensive guidelines and most of recommendations are based on expert consensus. Objective: To evaluate the effectof withdrawal of antiplatelet therapy on 30-day postoperative outcome in subjects undergoing elective major noncardiac surgery. Methods: A retrospective cohort study was performed in 1630 patients, 40 years and older, who underwent major noncardiac surgery. Age, gender, risk factors, previous chronic heart or lung disease, renal function, anemia and concomitant treatment were used in a binary logistic regression to determine the impact of withdrawal of antiplatelet therapy on prognosis. The primary outcome measure was a composite of 30-day postoperative mortality or cardiovascular events (cardiac arrest, myocardial infarction, stroke or pulmonary embolism). Results: Five percent of patients presented the composite primary outcome measure of 30-day postoperative mortality or cardiovascular events. Antiplatelet therapy was withdrawn in 11.4% of patients (table). Discontinuation of antiplatelet therapy was associated with a significant increase in the primary outcome measure (OR 2.27; CI95%: 1.16-4.46). Conclusions: In a contemporary cohort of patients undergoing noncardiac surgery, withdrawal of antiplatelet therapy was associated with a worse short-term prognosis. There is an urgent need for further research in this field.