Relationship Between Gastric Accommodation, TLESRs and Reflux in HV and in GERD With or Without Overlapping Dyspepsia

The HRiM catheter (Medical Measurement Systems, Enschede, The Netherlands) incorporating 36 pressure sensors, spaced at 2 cm in the stomach and esophagus and at 1 cm in the LES and upper esophageal sphincter (UES), and 16 impedance channels throughout the esophagus, will be placed transnasally, after topical anesthesia. Manometry will be used to record pressures in the stomach, the esophagus, the LES and the UES. In this way, it is possible to detect and characterize TLESRs, and to measure GA. The impedance channels will be used to measure bolus movement, and thus to detect and characterize gastro-esophageal reflux.