The race is on. After six years as the only FDA approved devices for left atrial appendage closure, Boston Scientific Corp.’s Watchman products face a challenger, Abbott Laboratories’ Amplatzer Amulet. With the Amulet’s FDA approval in mid-August and positive results in a head-to-head trial presented at the 2021 European Society of Cardiology Congress on Tuesday, the Watchman has reason to look over its shoulder at a competitor that could change the game entirely. The trial results were published simultaneously in Circulation.