title: Hyperinsulinemic hypoglycemia with nesidioblastosis after gastric-bypass surgery.
abstract: We describe six patients (five women and one man; median age, 47 years; range, 39 to 54) with postprandial symptoms of neuroglycopenia owing to endogenous hyperinsulinemic hypoglycemia after Roux-en-Y gastric bypass surgery. Except for equivocal evidence in one patient, there was no radiologic evidence of insulinoma. Selective arterial calcium-stimulation tests, positive in each patient, were used to guide partial pancreatectomy. Nesidioblastosis was identified in resected specimens from each patient, and multiple insulinomas were identified in one. Hypoglycemic symptoms diminished postoperatively. We speculate that hyperfunction of pancreatic islets did not lead to obesity but that beta-cell trophic factors may have increased as a result of gastric bypass.
authors: Department of Surgery, Mayo Clinic and Foundation, Rochester, MN, USA.
authors: Geoffrey J
authors: GJ
authors: Service
authors: Geoffrey B
authors: GB
authors: Thompson
authors: F John
authors: FJ
authors: Service
authors: James C
authors: JC
authors: Andrews
authors: Maria L
authors: ML
authors: Collazo-Clavell
authors: Ricardo V
authors: RV
authors: Lloyd
mesh_terms: D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D015390:Gastric Bypass; D006801:Humans; D006946:Hyperinsulinism / Q000209:etiology*; D006965:Hyperplasia; D007003:Hypoglycemia / Q000209:etiology*; D007340:Insulinoma / Q000150:complications / Q000175:diagnosis; D007515:Islets of Langerhans / Q000473:pathology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D046768:Nesidioblastosis / Q000209:etiology*; D009765:Obesity / Q000473:pathology / Q000601:surgery; D009767:Obesity, Morbid / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D010183:Pancreatic Ducts / Q000473:pathology; D010190:Pancreatic Neoplasms / Q000150:complications / Q000175:diagnosis; D011183:Postoperative Complications; D019518:Postprandial Period