Superior vena caval obstruction after an intraatrial baffle procedure can lead to acute cerebral complications and hence requires immediate management. We present a case of successful palliation of acute superior vena caval obstruction after a Senning procedure by establishing a venous shunt between the innominate vein and pulmonary artery. This technique resulted in immediate hemodynamic and functional improvement that subsequently allowed for the enlargement of the superior vena cava-right atrial junction with a pericardial patch.