Massive hemothorax complicating heparin anticoagulation for pulmonary embolus.

A case of massive hemothorax complicating heparin anticoagulation for pulmonary thromboembolism is presented. Hemothorax complicating anticoagulant therapy for PTE usually occurs within the first week of treatment and is invariably on the side of the initial clinical symptoms, suggesting intrapleural rupture of a hemorrhagic pulmonary infarct. Late hemothorax is unusual and may not be on the side of the initial symptoms, suggesting a different pathogenesis. Hemothorax may occur as the only bleeding complication of anticoagulation and when coagulation studies are within an acceptable therapeutic range. Cessation of anticoagulation therapy and prompt evacuation of the pleural space are recommended.