Once again, after decades of common use, a frequently implanted device has been found to confer no benefit whatsoever over a much less invasive therapy. Cardiologists and radiologists often implant the device, called a retrievable inferior vena cava filter, inside people who are at high risk for developing potentially lethal blood clots. The filter is designed to prevent pulmonary embolism, an extremely dangerous condition that occurs when a blood clot from the legs migrates into the lungs. Now a new study published in JAMA shows that these devices provide no advantage over anticoagulant drugs which thin the blood.
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