IVC filters can be used to try and prevent pulmonary emboli. Inferior Vena Cava (IVC) filters can be used in cases of documented pulmonary embolism (PE) where anticoagulation is contraindicated or has failed. The efficacy and safety of vena caval filters in the prevention of pulmonary embolism in patients with proximal deep-vein thrombosis are still a matter of debate. IVC filters had no detectable impact on mortality and are associated with an increased risk of recurrent deep venous thrombosis. They can be used in patients who remain “very high-risk” despite preventive or curative anticoagulant treatment. Indications for filter placement are restricted to contraindications to or failure of anticoagulant therapy.                                                                                                                                                                        Low molecular-weight heparin is as effective and safe as unfractionated heparin for the prevention of pulmonary embolism.