to investigate the incidence and clinical significance of postoperative pericardial effusion ( pe ) , the presence of pe was evaluated by echocardiography , 1 and 2 weeks postoperatively , in 50 patients after insertion of a valve prosthesis and in 100 patients after coronary bypass surgery ( 50 patients receiving a combination of aspirin and dipyridamole and 50 receiving warfarin ) .
C0031039
pe
C0043031
warfarin