Temporary dumping syndrome after gastric peroral endoscopic myotomy: should we control the glycemia?

Gastric peroral endoscopic myotomy (G-POEM) is a new endoscopic technique that involves cutting the pyloric sphincter, with minimal invasiveness compared with the surgical approach [1] [2] [3]. The technique can be used to treat post esophagectomy gastric outlet obstruction [4]. Here, we report the case of post esophagectomy outlet obstruction treated with G-POEM but complicated by multiple episodes of post-procedure hypoglycemia.

The patient had undergone esophagectomy in 2004 for the treatment of squamous cell carcinoma and liver transplantation in 2009. He was referred 4 months ago for dysphagia, vomiting, and gastric sensation of heaviness. To minimize his symptoms, he had progressively reduced his food intake and, consequently, had lost 10 kg in weight. Parenteral nutrition was introduced. The patient was diagnosed with post esophagectomy gastric outlet obstruction and G-POEM was planned.

The patient experienced hypoglycemia during parenteral nutrition 3 days before G-POEM. A normal diet was started, with dietary supplements, and parenteral nutrition was stopped 2 days before the procedure. After the nutritional status had improved, G-POEM was performed ([Fig. 1]). An incision was made in the antrum and a 4 cm tunnel was created. A 2 cm cut in the circular muscle of the antrum was made, followed by cutting of the pylorus muscle

Fig. 1 Gastric peroral endoscopic myotomy procedure. a Endoscopic view of the pylorus before the myotomy. b Mucosal incision. c Submucosal tunneling. d View of the pylorus muscle in the tunnel. e Myotomy using a HookKnife. f View of the final myotomy.

On the day after the procedure and during the subsequent 2 days, the patient experienced hypoglycemia three times, with glucose levels of 3.9, 4.1, and 2.1 mmol/L, respectively, and accompanied by symptoms of tachycardia, unease, and sweating; these episodes followed the intake of a sugary snack in the afternoon. Glycemic balance was apparent, with normal insulin and C-peptide levels. After discussion with an endocrinologist, a dumping syndrome was diagnosed [5]. No specific treatment was required, and the patient was educated on the need to take complex carbohydrate snacks rather than sugary snacks.

After discharge, the patient was monitored and only two new hypoglycemia episodes occurred (Day 7 and Day 20). These early evaluations showed that G-POEM was effective for the initial resolution of symptoms, with no further dysphagia, gastric heaviness, or vomiting experienced.

G-POEM is a new effective option for the treatment of gastric obstruction, but glycemia should be monitored to ensure early detection of dumping syndrome in the days following the procedure. This syndrome can be controlled easily by educating the patient on ways to reduce glucose spikes.

Endoscopy_UCTN_Code_CPL_1AJ_2AI

Competing interests: None

• References

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• 5 Malik S, Mitchell JE, Steffen K et al. Recognition and management of hyperinsulinemic hypoglycemia after bariatric surgery. Obes Res Clin Pract 2015;