The LAAC (Left Atrial Appendage Closure) or Watchman procedure is a minimally invasive procedure aimed at significantly reducing the risk of stroke in patients with atrial fibrillation (AFib), a common heart rhythm disorder.

The procedure uses a thin, flexible tube called a catheter. The catheter is inserted through a small incision, usually in the groin, and threaded through the blood vessels to the heart. Once the catheter reaches the heart, a small umbrella-like plug called a Watchman device is placed into the left atrial appendage (LAA). This seals off the LAA from the rest of the heart and prevents blood clots escaping into the bloodstream.

Successful LAAC can eliminate the need for long-term blood thinners, and thus minimize the risk of bleeding complications for patients with AFib. The procedure offers a safe and minimally invasive way to prevent strokes for patients with AFib, and most patients can go home within a day of the procedure.