Vena caval filters for the prevention of pulmonary embolism in people at high risk of, or with established venous thromboembolism

Objectives This is a protocol for a Cochrane Review (intervention). The objectives are as follows: To assess the efficacy and safety of vena caval filters (VCFs) in preventing acute pulmonary embolism (APE) in people with established venous thromboembolism (VTE), or those at high risk of developing APE.