2.2. RSI Questionnaire and RFS

The RSI questionnaire, which contains nine questions, and endoscopic evaluation of RFS, which contains eight items, were undertaken in moderate to severe OSA patients who underwent CPAP therapy. The RSI is a questionnaire with nine questions created to document symptoms and the severity of LPR. Patients fill out the questionnaire on a scale of zero to five describing how these nine problems affected them over the past month. The maximum total score is 45, and a total score greater than 13 is considered indicative of LPR. As shown in Table 1, the RSI questionnaire was translated into Korean and used to evaluate patient symptom history and symptom characteristics [5]. The RFS is characterized using an eight-item evaluation sheet designed to assess the clinical severity of LPR based on laryngoscope findings. RFS rates the location and severity of inflammatory changes, including subglottic edema, ventricular obliteration, erythema, vocal cord edema, diffuse laryngeal edema, posterior commissure hypertrophy, granuloma, and thick endolaryngeal mucus, as shown in Table 2 [6]. The maximum total score is 26 points, and generally, a score of 7 points or more is considered indicative of LPR. To assess the potential adjuvant therapeutic effect of CPAP treatment on LPR, we compared RSI and RFS pretreatment and three months post-treatment.

Reflux symptom index questionnaire.

Reflux finding score.