Use of Amplatzer occlusion devices to occlude Fontan baffle leaks during fenestration closure procedures.

The authors describe the use of Amplatzer occlusion devices to successfully occlude Fontan baffle leaks in three patients. These additional right to left shunts were recognized at the time of elective transcatheter closure of surgically created fenestrations. A common site of baffle leak is described at the base of the right atrial appendage. This suture line serves to exclude the right atrial appendage from Fontan baffle flow and lies within the corrugated surface of the pectinate muscles, making it particularly vunerable to baffle leaks over time.