Submucosal Clustered Brownish Microvessels Based on NBI Endoscopy: A Characteristic of LPR.

Objective This study aimed to analyze the characteristics of laryngopharyngeal reflux (LPR) by using narrow band imaging (NBI) endoscopy. Study Design A prospective study. Setting A large-volume practice with tertiary care providers. Methods A total of 67 patients with suspected LPR who underwent 24-hour multichannel intraluminal impedance-pH monitoring were included from June 2020 to March 2022. Manifestations of NBI endoscopy included submucosal clustered brownish microvessels (CBMs), spotted brownish microvessels, and no special microvessels; the latter 2 formed the non-CBM group. The manifestations of all patients and their changes were observed after 8 weeks of proton pump inhibitor and symptomatic treatment for patients with LPR, and symptomatic treatment for patients without LPR. Results According to the results of 24-hour multichannel intraluminal impedance-pH monitoring, the incidence of submucosal CBMs was significantly higher in patients with LPR (30 cases) than in those without LPR (37 cases, P < .001), particularly in the posterior cricoid area (P < .001). Besides Reflux Finding Score, the incidence of signs such as subglottic edema and vocal fold edema was significantly higher in the CBM group than the non-CBM group (P < .05). Finally, 22 patients with LPR (91.7%) and only 2 patients without LPR (28.6%) underwent a transformation from CBMs to spotted brownish microvessels after continuous medication for 8 weeks in the CBM group (chi(2) = 15.916, P < .001), while no significant change was observed in patients with or without LPR in the non-CBM group (P > .05). Conclusion Submucosal CBMs in the posterior cricoid area under NBI endoscopy may be a characteristic of LPR. Level of Evidence: 4.