Abstract:Objective To study the accuracy of NBI technique in diagnosing LPRD in children.Methods From January 2021 to July 2021, 60 children aged 4 to 16 who underwent tonsillectomy in our hospital for chronic tonsillitis or hypertrophy were recruited. Parents and children filled in the Reflux Symptom Index Scoring Scale (RSI) together , and 2 otolaryngologist filled in the Reflux Signs Scoring Scale (RFS).Results As aa result RSI > 13 in 22 cases (36.7%), RSI≤13 in 38 cases (63.3%),RFS > 7 in 35 cases (58.3%),RFS≤7 in 25 cases (41.7%), Pepsin (+) in 39 cases (65%), Pepsin (-) in 21 cases (35%).There was no significant difference in RSI score with or without laryngopharyngeal reflux (P > 0.05), and there was significant difference in RFS score with or without laryngopharyngeal reflux (P < 0.05).The comparison of RFS score between ordinary white light and NBI showed statistically significant difference (P < 0.05), among which, there were significant differences in vocal cord edema, diffuse edema of laryngeal mucosa, hyperemia and erythema.Conclusion Compared with white light, NBI view can identify RFS parameters such as vocal cord edema, diffuse laryngeal mucosa edema, hyperemia and erythema more easily, which can improve the accuracy of LPRD diagnosis in children.