How Does It Compare to the Standard pH Probe?
Farnoosh Farrokhi, MD, Eric M. Hill, MD, George Sun, MD, Sean P. Casey, MD, Milton O. Ochieng, Gregory D. Ayers, BS, Michael F. Vaezi, MD, FACG., *Gastroenterology, Vanderbilt University Medical Center, Nashville, TN.Purpose: Physiologic assessment of esophageal acid exposure is often performed utilizing ambulatory pH monitoring. Recently ambulatory Restech Dx- H probe is designed to record pH changes in the oropharynx in patients with suspected extraesophageal reflux symptoms. However, there are no validations of this instrument against the current standards in clinical practice. Thus, we aimed to compare the internal consistency of the new distal esophageal Dx-pH probe with the standard of care Sandhill pH probe.Methods: Patients diagnosed with GERD (esophagitis at endoscopy or prior abnormal pH findings off acid suppressive therapy) underwent simultaneous ambulatory esophageal pH monitoring. The Dx-pH and Sandhill pH probes were positioned at 5 cm above the manometrically measured L
