NEW YORK, Mar 20: Some hospitals insert filters into the blood vessels of more than one-third of their patients with clots that may travel to the lungs, despite a lack of evidence they save lives, according to a new study. The filters, made of metal wires, are recommended based on theories about how they work for patients with a so-called venous thromboembolism who can’t take anti-clotting drugs. (agencies)
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