Trial Investigating Efficacy of G-POEM

Inclusion Criteria: * The ability to give signed written informed consent, * Patients with diabetes and gastroparesis, * Age \>18 years, * Gastroparesis is diagnosed with technetium-scintigraphy, * Normal gastroscopy, Exclusion Criteria: * Ongoing cancer treatment or other concurrent illness that will make the patient unable to attend the study on the discretion of the investigator, * Recent gastrointestinal surgery, * Active duodenal/gastric ulcer disease, * Diseases in the ventricle or previously complicated upper abdominal surgery, * Previous bariatric surgery, * Pregnancy or breastfeeding, * Parkinson disease, * Persons who, in the judgement of the investigator, may be unable to follow the protocol, Use of metoclopramide, domperidone, prucalopride, ghrelin, macrolide antibiotics (eg, azithromycin, clarithromycin, erythromycin) during study period. * drugs with an anti-cholinergic mechanism, * Use of motility slowing agents: anticholinergic agents, calcium channel blockers, TCA, GLP-1 analogs, Lithium, diphenhydramin, glucagon, dopamine agonists, progesterone, L-dopa, calcitonine, octreotide, interferon alfa, sucralsulfate, * botulinum toxin injections (eg, Botox®) by pyloric injection less than 4 months prior to procedure