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FDA: Don't Use Pradaxa Blood Thinner in Patients With Artificial Heart Valves
Date:12/20/2012

THURSDAY, Dec. 20 (HealthDay News) -- The blood thinner Pradaxa should not be used to prevent stroke or blood clots in patients with mechanical heart valves, the U.S. Food and Drug Administration said in a warning issued Wednesday.

As the agency noted, a clinical trial in Europe was halted recently because patients taking Pradaxa (dabigatran) were more likely to suffer strokes, heart attacks and clots forming on their mechanical heart valves than patients who were taking the older blood thinner warfarin.

Patients in the study who were taking Pradaxa also had more bleeding after valve surgery, the agency said.

Doctors should immediately switch patients with a mechanical heart valve who are taking Pradaxa to another medication, the FDA said. The use of Pradaxa in patients with heart valve replacements made of natural biological tissue has not been evaluated and cannot be recommended, the agency added.

The message for patients is that anyone who has received any type of heart valve replacement and is taking Pradaxa should talk to their doctor as soon as possible to determine the most appropriate type of blood thinner (anticoagulant) to take, the FDA said.

Consultation with a physician is crucial, agency officials said, because stopping anticoagulant drugs without seeking advice from their doctor first can increase the risk of blood clots and stroke.

Pradaxa is approved to treat patients with a common heart rhythm disorder called atrial fibrillation. It is not approved to treat patients with atrial fibrillation caused by heart valve problems, the FDA said.

More information

The American Heart Association has more about heart valves.

-- Robert Preidt

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