Night blindness after duodenal switch

A 34-year-old woman with a body mass index of 50.3 kg/m2 underwent laparoscopic biliopancreatic diversion with duodenal switch and was discharged with supplemental iron, calcium, vitamin D, and multivitamins containing 1600 IU of vitamin A. The operation and postoperative period was uneventful. Six months after surgery, biochemical screening revealed vitamin A deficiency with a serum retinol of 0.7 μmol/L (normal range 1.1–2.8; preoperative...