The Use of Body Surface Gastric Mapping in Assessing the Clinical Success of G-POEM

The aim of this protocol is to build on the investigators currently approved study to evaluate the outcomes and predictors of success of Gastric peroral endoscopic myotomy (G-POEM). The investigators plan to incorporate BSGM in determining the treatment success after G-POEM in patients with refractory gastroparesis and potentially identify a phenotype of gastroparesis patients who may respond more favorably to G-POEM based on their baseline BSGM profile. The currently approved G-POEM study (IRB #1708840627 and ClinicalTrials.gov ID NCT04434781) at our center tracks patients' symptoms and quality of life at baseline and post G-POEM. the investigators plan to supplement the existing study by adding BSGM variables. Although the investigators have specific outcomes identified, the investigators would like to stress that this is a pilot study that will serve to identify patterns and trends that could be studied further in the future using larger cohorts of patients.

The investigators' primary objective is to evaluate the safety and feasibility BSGM in refractory gastroparesis patients undergoing G-POEM.

the investigators will also investigate whether changes in BSGM measures correlate with changes in symptoms and quality of life.

Additionally, the investigators' aim to compare the diagnostic performance of BSGM, and gastric emptying scans as depicted on scintigraphy.

The investigators' primary aim is to assess the feasibility and safety of in gastroparesis patients undergoing G-POEM. Clinical success is defined as improvement in GCSI by 1 point or more compared to baseline.