Postoperative obstruction of conventional chest tubes with blood and other fibrinous material in the setting of postoperative bleeding contributes to RBC.(Shalli) In a recent study of postoperative cardiac surgery patients at the Cleveland Clinic, 36% of patients were found to have evidence of chest tube obstruction [Karimov JH]. Active Clearance with PleuraFlow has been shown to prevent chest tube clogging, and reduce RBC. (Shiose, Arakawa, Perrault) The purpose of this registry is to evaluate the effectiveness of PleuraFlow System, a commercial Class II (US), Class IIb (Canada, Europe, and Australia), in the management of blood evacuation after cardiac surgery. Additionally, the purpose is to educate about the incidence of complications and post-surgical interventions consistent with Retained Blood Complications (RBC) after adult cardiac surgery. The purpose of this registry is also to collect post-market surveillance data on PleuraFlow ACT.