Author + information
Conformation to the left atrial appendage anatomy of a 16 mm ACP device (Amplatzer, Golden Valley MN) and a 21 mm Watchman (Boston Scientific, Natick, MA) was compared in a fresh canine heart ex vivo. The atrial wall of a heart from an 8-month hound-type 21 kg male dog was removed to allow visualization and deployment of the devices into the left atrial appendage. Each device was deployed, measured, and photographed for conformation to the left atrial appendage in the same heart in order to assess fit in identical anatomy.
Watchman had 51% less surface exposure (154 mm2) compared to the ACP device (314 mm2). The ACP device was appeared to impinge on the mitral valve compared to the Watchman. In addition, the superior edge of the ACP device was closer to the pulmonary vein ostia compared to that of Watchman. These data demonstrate superior positioning of Watchman compared to the ACP device in the left atrial appendage with lower risk of affecting other cardiac structures.
ACP (Figure 1⇓) and Watchman (Figure 2) device placement in the left atrial appendage in the same canine heart. The mitral valve is impinged by the placement of the ACP device, but not the Watchman device.
- 2013 American College of Cardiology Foundation