 The wedge catheter could then be easily advanced across the Fontan fenestration into the right atrium and guidewire manipulation allowed access across the atrial septal defect to the pulmonary veins, left atrium, and left ventricle.
The wedge catheter could then be easily advanced across the Fontan fenestration into the right atrium and guidewire manipulation allowed access across the atrial septal defect to the pulmonary veins , left atrium , and left ventricle .