Treatment is immediate PA banding. Control of the pulmonary trunk is achieved in the event the PA needs to be snared to prevent pulmonary overcirculation and inadequate systemic perfusion during bypass, or to ensure adequate coronary perfusion pressure. Deep hypothermia and low flow bypass are established. If there is associated interrupted aortic arch , repair is done under circulatory arrest. Meticulous myocardial preservation is necessary to avoid ischemic injury.
Care is taken with the nearby origin of the left coronary artery.
The defect in the trunk is oversewn or closed with a homograft patch. An incision is made in the infundibulum of the RV outflow tract. Patch closure of the VSD is performed in such a way as to baffle LV blood into the neoaorta. Turley K . Current method of repair of truncus arteriosus.