The goal of this clinical trial is to learn if topical anesthesia (lidocaine spray) affects the phonation process during High-Speed Digital Imaging (HSDI) laryngoscopy in adults with laryngopharyngeal reflux (LPR). The main questions it aims to answer are:
Does topical anesthesia change phonation process parameters (such as mucosal wave amplitude, glottal closure pattern, phase symmetry, and periodicity) as assessed on the Voice-Vibratory Assessment with Laryngeal Imaging (VALI) form? Does topical anesthesia change the type of glottal insufficiency observed during phonation?
Researchers will compare HSDI recordings performed with topical anesthesia (lidocaine spray) to recordings performed with placebo (physiological saline) to see if topical anesthesia alters phonation process findings.
Participants will:
Undergo HSDI laryngoscopy recording on two consecutive days, once with topical anesthesia and once with placebo, in a randomized, double-blind order Have a detailed medical history taken and complete the Reflux Symptom Index (RSI) questionnaire Undergo fiberendoscopic examination for determination of the Reflux Finding Score (RFS) Return for a follow-up examination within three months, during which they will continue proton pump inhibitor therapy and hygienic-dietary measures