<prompt> Potts surgery:Left pulmonary artery and descending aortaLeft pulmonary artery and ascending aortaMain pulmonary artery and aortaLeft pulmonary artery and subclavian artery  <response>: Ans. A. Left pulmonary artery and descending aorta Ref: Parks Pediatric Cardiology for Practitioners 6thed pl29Explanation1. Classic Blalock-Taussig BT shunt, anastomosed between the subclavian artery and the ipsi- lateral PA, is usually performed for infants older than 3 months because the shunt is often thrombozed in young infants.2. Modified BT shunt, a Gore-Tex interposition shunt is placed between the subclavian artery and the ipsilateral PA. This is the most popular procedure for any age. The surgical mortality rate is 1 or less.3. The Waterston shunt, anastomosed between the ascending aorta and the right PA, is no longer performed because of a high incidence of surgical complications.4. The Potts operation, anastomosed between the descending aorta and the left PA, is no longer performed. 