RESUMEN
Objective At present,there are relatively few studies on the application of pepsin in the diagnosis of laryngopha -ryngeal reflux disease(LPRD)in China.This paper aimed to evaluate the application value of Peptest in the diagnosis of LPRD by measuring saliva/sputum pepsin in patients with chronic pharyngitis. Methods From January to June 2017,35 patients with chronic pharyngitis treated in our department were selected to undertake electronic laryngoscopy and evaluated by reflux finding score(RFS) and reflux symptom index(RSI)scoring.The patients'saliva/sputum samples were collected three times for pepsin concentration de-tection(PEPTEST).The first collection was before mouthwash in the morning,the second was 1h after lunch,and the third was the time of evident symptoms.Comparative research was carried out on the above results. Results The average RSI score and RFS score were11.31±6.21 and 5.97±1.98.The pepsin content in morning saliva/sputum[26.80(0,109.80)ng/mL]was significantly lower than that at 1 h after lunch[89.00(16.0,254.8)ng/mL]and that at the time of obvious symptoms[105.70(34.3,254.8)ng/mL](P<0.05).The area under ROC of Peptest in the morning[0.759(0.602, 0.917)],1h after lunch[0.824(0.670,0.978)], at the time of ob-vious symptoms were all greater than the combination of RSI and RFS, representing significant statistical differences(P<0.05). Conclusion Compared with traditional method(a combination of RSI and RFS),Peptest has more important clinical value in the diag-nosis of LPRD.