Figure 31: Cartoon showing the various types of aorto - pulmonary shunts that have been used over the past half century. The classical Blalock - Taussig shunt connects the subclavian artery opposite the side of the aortic arch end - to - side to the ipsilateral pulmonary artery. The modified Blalock - Taussig shunt is constructed by inserting a tube graft between the innominate artery or the proximal subclavian artery and the ipsilateral pulmonary artery. The Potts shunt is a side - to - side connection of the left pulmonary artery to the descending aorta. A Waterston shunt is a connection of the ascending aorta side - to - side to the right pulmonary artery. (Modified from Valente et al. [11] with permission).