142. Gastric dumping syndrome - classification, etiology, pathogenesis, clinical manifestations.

Gastric dumping syndrome - classification, etiology, pathogenesis, and clinical manifestations.

Dumping syndrome refers to a group of symptoms caused by rapid emptying of hyperosmolar gastric contents into the small intestine, usually after gastric surgery.

Classification

1. 1 Early dumping syndrome

• Occurs within 30 minutes after eating.

1. 2 Late dumping syndrome

• Occurs 1.5–3 hours after eating.

Etiology

Most common cause

• Gastric surgeries that impair pyloric function, such as:
• Partial gastrectomy (e.g., Billroth I, II).
• Gastric bypass (Roux- en-Y).
• Vagotomy with pyloroplasty.

Other contributing factors

• Loss of gastric reservoir capacity.
• Loss of controlled gastric emptying mechanism.

Pathogenesis

Early dumping

1. Ingested food enters small intestine rapidly due to absent or bypassed pylorus.
2. Hyperosmolar chyme draws fluid rapidly from plasma into intestinal lumen → intestinal distension - bloating and cramping and hypovolemia - dizziness and hypotension.
3. Leads to vasomotor (dizziness, tachycardia, sweating, hypotension.) and GI symptoms .( abdominal pain, diarrhea, nausea. )

Late dumping

1. Rapid glucose absorption causes sudden hyperglycemia.
2. Excessive insulin release → rebound hypoglycemia (exc glu uptake)
3. Leads to hypoglycemic symptoms.

Clinical manifestations

Early dumping symptoms (fluid shift- related)

• Abdominal pain and bloating.
• Nausea, diarrhea.
• Flushing, palpitations.
• Dizziness, hypotension.
• Fatigue.

Late dumping symptoms ( hypoglycemia - related)

• Sweating.
• Weakness, tremor.
• Palpitations.
• Confusion.
• Hunger.