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
Age range
18 Years – 45 Years
Sex
ALL
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Change in Phonation Process Parameters Assessed by the Voice-Vibratory Assessment with Laryngeal Imaging (VALI) Form
Timeframe: Assessed once per recording session; each participant recorded on 2 consecutive days (with and without topical anesthesia)
Change in Glottal Closure Pattern (European Laryngological Society Classification)
Timeframe: Assessed once per recording session; each participant recorded on 2 consecutive days (with and without topical anesthesia)
Change in Type of Glottal Insufficiency (European Laryngological Society Classification)
Timeframe: Assessed once per recording session; each participant recorded on 2 consecutive days (with and without topical anesthesia)
Change in Acoustic Voice Parameters (Fundamental Frequency and Phonation Intensity)
Timeframe: Assessed once per recording session; each participant recorded on 2 consecutive days (with and without topical anesthesia)
Change in Maximum Phonation Time (MPT)
Timeframe: Assessed immediately before and after each HSDI recording session; each participant recorded on 2 consecutive days (with and without topical anesthesia)