What surgical treatment is recommended for an adult with severe gastroparesis refractory to dietary modification, prokinetic agents, and anti‑emetics, without mechanical obstruction and who is fit for anesthesia?

Surgical Treatment for Severe Gastroparesis

For severe gastroparesis refractory to medical therapy, gastric electrical stimulation (GES) should be considered for patients with predominant nausea and vomiting, while gastric per-oral endoscopic myotomy (G-POEM) can be considered for select patients with severe gastric emptying delay, both performed at tertiary centers with multidisciplinary expertise. 1

Primary Surgical Options

Gastric Electrical Stimulation (GES)

• GES is recommended specifically for refractory/intractable nausea and vomiting that has failed standard medical therapy 1
• This is the only intervention with sham-controlled trial data demonstrating superiority over placebo 2
• Shows highest efficacy at intermediate follow-up (>3-36 months) 2
• Critical exclusion: patients must not be on opioids to be considered for GES 1
• Particularly effective in diabetic gastroparesis for nausea/vomiting symptoms 3

Gastric Per-Oral Endoscopic Myotomy (G-POEM)

• Should only be performed at tertiary care centers using a team approach involving motility specialists and advanced endoscopists with extensive gastroparesis experience 1
• Best suited for select patients with severe delay in gastric emptying 1
• Demonstrates greatest short-term symptom improvement and improved gastric emptying 2
• Not first-line therapy due to lack of randomized sham-controlled studies and limited long-term follow-up data 1
• Important caveat: theoretical risk of dumping syndrome, which can worsen food tolerance and quality of life 1

Combined Approach

When malnutrition is present requiring feeding access:

• Pyloric intervention (pyloroplasty or G-POEM) should be performed concurrently with jejunostomy tube placement 4
• Combined GES + pyloric surgery shows CPGAS improvement of 3.6 ± 0.5 versus GES alone at 2.5 ± 0.4 3
• Pyloric intervention is the only independent predictor of successful jejunostomy tube removal (OR 5.032) 4

Interventions NOT Recommended

Botulinum Toxin Injection

• Two larger placebo-controlled studies showed no benefit over placebo 1
• Should only be used in clinical trials 1

Transpyloric Stent Placement

• Should be considered investigational due to lack of prospective sham-controlled trials and concerns over stent migration 1

Laparoscopic Pyloroplasty or Sleeve Gastrectomy

• Role remains unclear due to absence of large, well-designed, sham-controlled trials 1

Partial or Total Gastrectomy

• Rarely required and carries significant risk of dumping syndrome 1
• Should only be considered after all available therapies exhausted, preferably at tertiary center 1

Nutritional Support When Surgery Fails

If symptoms persist despite surgical interventions:

• Endoscopic/surgical transjejunal tube or combined gastrojejunostomy tube placed beyond the pylorus 1
• Case series show weight recovery with acceptable morbidity/mortality, allowing removal after average of 20 months 1
• Parenteral nutrition may be needed in occasional patients with nutritional compromise as bridge to other therapies 1

Critical Decision-Making Algorithm

1. Confirm diagnosis: Verify appropriate 4-hour gastric emptying study methodology showing >35% retention for severe gastroparesis 1

2. Identify predominant symptom:

   • Nausea/vomiting predominant → Consider GES (if not on opioids) 1
   • Severe emptying delay with mixed symptoms → Consider G-POEM at center of excellence 1

3. Assess nutritional status:

   • Malnutrition present → Jejunostomy tube + concurrent pyloric intervention 4
   • No malnutrition → Proceed with GES or G-POEM based on symptom profile

4. Ensure appropriate setting: All invasive procedures should be performed at tertiary centers with gastroparesis expertise 1

Common Pitfalls to Avoid

• Do not pursue invasive options based on single gastric emptying study without clinical context - may miss functional dyspepsia or other mimics 1
• Do not offer GES to patients on chronic opioids - they will not respond 1
• Do not perform G-POEM outside specialized centers - requires specific expertise 1
• Do not jump to gastrectomy - this is last resort with significant morbidity 1