Boston Scientific Corp. believes the results from the PREVAIL trial are enough to finally secure US Food and Drug Administration approval for the firm’s Watchman (see Exhibit 1) left atrial appendage (LAA) closure device to prevent stroke in patients with atrial fibrillation (AF), but skepticism about the device lingers among some cardiologists.
The company released preliminary results from PREVAIL, which compared Watchman with long-term warfarin therapy in patients with nonvalvular AF, in conjunction with the 2013 American College of Cardiology (ACC) Scientific...