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Boston Scientific Completes Patient Enrollment in PREVAIL Study for First-in-Class WATCHMAN Device
Date:7/2/2012

NATICK, Mass., July 2, 2012 /PRNewswire/ -- Boston Scientific Corporation (NYSE: BSX) has completed enrollment in the PREVAIL confirmatory study, designed to gain U.S. Food and Drug Administration (FDA) approval for the WATCHMAN® Left Atrial Appendage (LAA) Closure device.  The prospective, randomized trial enrolled 407 patients at 42 sites and is comparing the WATCHMAN device to warfarin in high-risk patients with atrial fibrillation (AF) eligible for long-term warfarin therapy.  Patient follow up of six months is required prior to submission to the FDA.

"WATCHMAN is the most clinically studied device of its kind," said Vivek Reddy, M.D., Director of Cardiac Arrhythmia Service at Mount Sinai Medical Center and principal investigator of the PREVAIL study.  "WATCHMAN has the potential to provide atrial fibrillation patients with a safe and effective first-in-class device-based solution to reduce risk of stroke."

The PREVAIL study began enrollment in November 2010.  Patients were randomly selected to receive either the WATCHMAN device or remain on long-term warfarin therapy. Those selected to receive the WATCHMAN device remained on warfarin for 45 days following implant.  

WATCHMAN has been studied in more than 2,000 patients, exceeding 4,000 patient-years of follow up.  The evidence-based clinical program for WATCHMAN includes two landmark studies: the PROTECT AF trial and the ASA Plavix (ASAP) study.  In the multi-center, randomized PROTECT AF trial, the WATCHMAN device proved to be non-inferior to warfarin and demonstrated a 38 percent relative risk reduction for stroke, cardiovascular death and systemic embolism compared to long-term warfarin therapy in 707 patients.  Data from the prospective, multi-center ASAP study showed a 77 percent reduction of ischemic stroke risk in patients with AF implanted with the WA
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SOURCE Boston Scientific Corporation
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