Introduction
Gastroparesis — covered on the Advanced Motility Clinic page — means the stomach empties more slowly than it should. The pylorus, a muscular valve at the outlet of the stomach, often plays a significant role in this: when it doesn't relax and open properly, food struggles to pass through even when the rest of the stomach is trying to move it along. G-POEM (Gastric Peroral Endoscopic Myotomy) addresses this directly by dividing the pyloric muscle, using the same submucosal tunneling technique developed for achalasia (see the POEM page), performed entirely through an endoscope with no external incisions. It's generally reserved for gastroparesis that hasn't improved adequately with dietary changes and medication.
Is G-POEM safe, and does it work?
It's safe, and it helps most patients — though it's worth understanding honestly that results are more variable than for some of the other procedures on this site. Technically, the procedure succeeds almost every time — published studies consistently report success rates of 95% to 100%. Real symptom improvement follows in the majority of patients: roughly 70 to 80% see meaningful improvement in the months after the procedure. Over the longer term, that number tends to settle somewhat lower, with pooled data showing around 75% still doing well at three years, though individual studies range more widely, and patients who've already tried and not responded to other pylorus-focused treatments tend to see somewhat more modest results (around half responding well in one study of previously-treated, harder-to-treat patients). None of this means G-POEM isn't a good option — for many patients with gastroparesis not controlled by medication, it's a genuinely effective, minimally invasive alternative to surgery — but realistic expectations matter here more than for some procedures with more uniformly excellent outcomes data. Complications are relatively uncommon and generally manageable. The section further down this page, ‘The evidence in more detail,’ has the specific study data.
Who might be considered for G-POEM
- Confirmed gastroparesis via gastric emptying study, with symptoms not adequately controlled by dietary changes and medication
- Patients seeking a minimally invasive alternative to more invasive surgical options
- Diabetic gastroparesis specifically is a common and valid indication, given how relevant this is in the Indian context (see the Advanced Motility Clinic page)
What to expect: before, during, and after
- Before: gastric emptying study to confirm the diagnosis; sometimes functional testing of the pylorus itself to help predict how likely the procedure is to help
- During: performed under general anesthesia; a submucosal tunnel is created to directly access and divide the pyloric muscle
- After: a short hospital stay is typical, with a gradual return to normal diet
- Follow-up: structured symptom assessment at defined intervals to track response over time, since results can evolve over months to years
The evidence in more detail
This section is for anyone who wants the specific research behind the summary above — it's not necessary reading to understand the basics of this procedure, but it's here for transparency.
A recent clinical review found technical success consistently exceeding 95%, with short-term symptom improvement reported in up to 80% of patients. A systematic review and meta-analysis of 13 studies (952 patients) found pooled clinical success of 72% at 1 year, with success among initial responders at 71% at 2 years and 58% at 3 years; a separate meta-analysis focused specifically on long-term (3+ year) outcomes found a pooled clinical success rate of 75% at 36 months, with pooled technical success of 98.6%. One prospective study following patients closely over the first year found clinical response of 68% at 1 month, declining to 58% at 6 months and 48% at 12 months — illustrating that early response doesn't always predict durability in every patient. In patients specifically referred after failing other pylorus-targeted treatments, one study found a 6-month clinical success rate of 52%, similar regardless of what had been tried previously, with complication rates also comparable between groups. Adverse event rates across the pooled literature are relatively low, around 8%.
G-POEM care at KAGE
G-POEM is offered for gastroparesis that has not responded to dietary change and prokinetics, and only once delayed emptying has been objectively confirmed — our gastroenterologists do not treat symptoms alone as gastroparesis, because several other conditions produce the same picture. To have emptying formally measured and G-POEM candidacy assessed, book a consultation.
Frequently asked questions
It's a genuinely effective treatment for many patients, but not a guaranteed permanent cure for everyone — ongoing symptom monitoring and, in some cases, continued dietary or medical management alongside the procedure's benefit is realistic.
It can, including in patients who've already tried other pylorus-focused treatments without success — though response rates in that specific group tend to be somewhat more modest, around half in published data.
Coverage varies by policy; our team can help verify your specific coverage and explain costs during consultation.
No — it's generally reserved for gastroparesis not adequately controlled by dietary changes and medication first; see the Advanced Motility Clinic page for that initial approach.
The same technique applies, though outcomes can be influenced by how well underlying blood sugar control is managed alongside the procedure — diabetes management and gastroparesis treatment work best together, not separately.
Functional testing of the pylorus itself is increasingly used to help identify patients most likely to benefit, though this isn't yet a perfectly standardized predictor across all cases.
Most patients have a short hospital stay followed by a gradual return to normal diet over the following days to weeks.
Complications are relatively uncommon, with published rates around 8%; when they occur, they're generally manageable.
It's uncommon in children but can be considered for specific cases, managed by KAGE's pediatric gastroenterology team.
Book a consultation at KAGE
Speak to a KAGE gastroenterologist about your symptoms, your diagnosis, or a second opinion.