Physical and pH Properties of Gastroesophagopharyngeal Refluxate: A 24-hour Simultaneous Ambulatory Impedance and pH Monitoring Study

Abstract

Concurrent impedance and pH recordings detect significantly more events qualifying as reflux in the pharynx than pH recordings alone. A substantial majority of these events are gaseous refluxes both with and without minor pH drops. Gas reflux events with weak acidity appear to be more common among patients with reflux-attributed laryngeal lesions compared to GERD patients and controls.