Dumping syndrome
Dumping syndrome follows rapid emptying of hyperosmolar gastric contents into the small bowel after gastric surgery, producing early gastrointestinal and vasomotor symptoms within 30 minutes of eating or late reactive hypoglycemia 1 to 3 hours after eating. Diagnosis is clinical from the postoperative time course, supported by an oral glucose challenge, and treatment starts with dietary modification before escalating to acarbose or octreotide.
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What this article covers
- Overview
Definition: dumping syndrome is a postprandial disorder caused by rapid transit of hyperosmolar gastric contents into the small intestine after gastric surgery, producing gastrointestinal and vasomotor symptoms.
- Epidemiology
Common after gastric surgery: roughly 25% to 50% of patients who undergo gastric surgery experience some symptoms of dumping syndrome.
- Risk factors
Roux-en-Y gastric bypass: creates a small gastric pouch emptying directly into the small bowel, bypassing normal pyloric regulation of emptying.
- Pathophysiology
Loss of the pyloric brake: surgery that bypasses, resects, or disables the pylorus removes the gatekeeper that normally regulates gastric emptying, so hyperosmolar chyme empties into the small bowel too quickly.
- Clinical features
Timing defines the phenotype: symptoms beginning within 30 minutes of eating are early dumping; symptoms beginning 1 to 3 hours after eating are late dumping.
- Differential diagnosis
Gastroparesis: postprandial nausea, vomiting, and early satiety from delayed rather than accelerated gastric emptying, distinguished by a gastric emptying scintigraphy study showing retention rather than rapid transit (Gastroparesis).
- Diagnosis
The diagnosis is clinical: it is established by a typical time course and symptom cluster after a compatible gastric surgery (Roux-en-Y bypass, sleeve gastrectomy, pyloroplasty, vagotomy, or partial…
- Management
Start with dietary modification, the first-line treatment for all patients: eat small, more frequent meals; separate liquids from solids by taking fluids only between meals rather than with them…
- Complications
Protein-wasting malnutrition: occurs in severe, longstanding cases from a combination of reduced intake and accelerated transit.
- Prognosis
Generally favorable: most patients, especially after bariatric surgery, improve substantially with dietary modification alone, and early dumping after bariatric surgery often resolves within the first 12 weeks.
- Prevention
Preoperative counseling before every Roux-en-Y bypass, sleeve gastrectomy, pyloroplasty, vagotomy, or gastrectomy: teach the postoperative small-frequent-meal, liquids-between-meals, low-simple-sugar…
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