Backgound: Pepsin immunohistochemical (IHC) staining is a promising diagnostic approach of laryngopharyngeal reflux (LPR). The interarytenoid mucosa has been proved to be an effective biopsy area.Objectives: To investigate whether positive result of pepsin IHC staining in laryngeal lesions can predict LPR.Methods: The study included 136 patients with laryngeal cancer or vocal cord leukoplakia. 24 h multichannel intraluminal impedance-pH (MII-pH) was performed before operation, and pepsin IHC staining was performed on pathological sections after operation. The results of the two methods were compared.Results: Among the 136 patients, 101 with at least one LPR event were regarded as MII-pH positive group, and another 35 were negative. The positive rate of pepsin IHC staining was 93.1% in MII-pH positive group and 54.1% in MII-pH negative group (p < .05). If the MII-pH results were used as a reference, the sensitivity and specificity of pepsin IHC staining in the diagnosis of LPR were 93.1 and 45.7%, respectively. The consistency of pepsin IHC and MII-pH was moderate (Kappa value = 0.452).Conclusions: The sensitivity of pepsin IHC staining in laryngeal lesions for diagnosing LPR is satisfactory. The existence of false negative of MII-pH may be the main reason for the low specificity.
Keywords: Laryngopharyngeal reflux; immunohistochemical staining; multichannel intraluminal impedance; pH monitoring; pepsin.