Abstract:Objective To study the accuracy of narrow band imaging (NBI) technique in the diagnosis of laryngopharyngeal reflux disease (LPRD) in children.Methods A total of 60 children aged 4 to 14 years old who underwent tonsillectomy for chronic tonsillitis or hypertrophy of tonsil in our hospital from Jan 2021 to July 2021 were recruited. Parents and children completed the reflux symptom index (RSI) questionnaires under doctor's guidance, and 2 otolaryngologists filled in the reflux finding score (RFS). The expression of pepsin in the resected tonsil was detected by immunohistochemistry.Results Of the 60 cases, RSI was more than 13 in 22 cases (36.7%) and equal to or less than 13 in 38 (63.3%), RFS was more than 7 in 35 cases (58.3%) and equal to or less than 7 in 25 (41.7%), pepsin was positive in 39 cases (65%) and negative in 21 (35%). The difference of RSI score between children with and without LPRD was statistically insignificant (P>0.05), while that of RFS score was significant (P<0.05). The comparison of RFS score between ordinary white light and NBI endoscopy showed statistically significant differences in vocal cord edema, diffuse edema, hyperemia and erythema of laryngeal mucosa (P<0.05).Conclusion NBI view is more liable than ordinary white light view to identify RFS parameters such as vocal cord edema, diffuse edema, hyperemia and erythema of laryngeal mucosa, which can improve the accuracy of LPRD diagnosis in children.