Left Circumflex Fistula After Watchman Implantation: A Case Report of Left Atrial Appendage Closure Complication.

Left atrial appendage closure devices reduce the risk of stroke in patients with nonvalvular atrial fibrillation while avoiding the risks associated with therapeutic anticoagulation. This significant value comes with additional unique risks associated with device implantation or surgical closure. We discuss an uncommon complication of Watchman device (Boston Scientific) implantation wherein an asymptomatic fistulous connection developed between the left atrial appendage and the left circumflex artery. Additionally, we review other documented cases of left atrial appendage fistulas and current management approaches for iatrogenic fistulous connections associated with procedural left atrial appendage closure.