HRIM vs Mucosal Impedance in GERD Participants

"During the clinical endoscopy, the 2.13 mm catheter will be passed through the channel of the standard endoscope this is called an Intraluminal Impedance. The Intraluminal impedance (made by Sandhill Scientific) has not been approved by the Food and Drug Administration (FDA) but it is considered to be minimal risk related to using it. The catheter gives the investigators a reading at each level.~* The catheter will be placed on the esophageal mucosa 5 cm above the gastroesophageal junction (where the stomach and esophagus meet) for 5 second~* At 10 cm above the gastroesophageal junction the catheter will be placed for 5 seconds~* And at 20 cm"