RESUMO
BACKGROUND: Left atrial appendage closure (LAAC) is frequently performed during cardiac operations, but the impact of LAAC on patient outcomes is not fully known. We hypothesized that the addition of LAAC would increase morbidity and resource utilization. METHODS: All patients undergoing cardiac surgery from a multi-institutional Society of Thoracic Surgeons database from 2011 to 2016 were stratified by LAAC. The effect of LAAC on risk-adjusted outcomes was assessed by hierarchical regression modeling accounting for preoperative risk factors, planned surgical procedure, hospital, and year. RESULTS: Concomitant LAAC was performed on 2384 of 28,311 patients (9.3%), who were older, with a greater burden of preoperative atrial fibrillation and heart failure. Although the addition of LAAC increased the risk of new-onset postoperative atrial fibrillation (OR 1.69, P < 0.01), it did not increase rates of major morbidity (OR 1.00, P = 0.970), stroke (OR 0.92, P = 0.787), or mortality (OR 0.93, P = 0.684). Although cardiopulmonary bypass time was not significantly increased by LAAC, patients' total hospitalization costs were $3035 higher (P = 0.018). CONCLUSIONS: Although concomitant LAAC was not associated with major complications, there were higher risk-adjusted rates of new-onset postoperative atrial fibrillation. Furthermore, LAAC added approximately $3000 to a patient's total hospital cost. These short-term risks and costs should be weighed against potential long-term benefits of left atrial appendage closure.