Does reflux symptom index and reflux finding score have clinical utility in the diagnosis of laryngopharyngeal reflux disease?

Background Reflux symptom index(RSI) and reflux finding score (RFS) are widely used scoring systems used to diagnose laryngopharyngeal reflux disease(LPRD). However many patients do visit the outpatient department with minimal symptoms not sufficient to fit the criteria described by Belafsky et al. for diagnosing LPRD. Most of these patients are provisionally diagnosed and treated for LPRD. Reflux symptom index(RSI) and reflux finding score (RFS) are widely used scoring systems used to diagnose(LPRD) (Belafsky PC et al., J Voice 16(2):274-7, 2002, Belafsky PC et al, Laryngoscope 111(8):1313-7, 2001). RSI has nine questions that the patient must grade from 0 to 5. An abnormal score is greater than 13. Laryngopharyngeal reflux (LPR) may or may not be diagnosed using the RSI and RFS especially when patients present with minimum symptoms not sufficient to score more than 13 and 7 respectively. These patients may miss the diagnosis and have to be treated empirically. Pepsin's presence in the saliva is indicative of reflux as pepsin is a gastric enzyme (NICE advice on Peptest for diagnosing gastro-oesophageal reflux, 2015, Wood JM et al., J Laryngol Otol 125(12):1218-24, 2011). Patients with minimum symptoms may be missed if diagnosis relies only on RSI AND RFS. The present study aims to see the correlation of pepsin-proven LPRD and RSI and RFS. Methods This is a prospective study, 49 patients with symptoms suggestive of LPRD who tested positive for the pepsin test were further analysed for RSI and RFS. A cut-off value of > 25 ng/mL was considered diagnostic of LPRD (Dhillon VK et al., Curr Gastroenterol Rep 18(8):44, 2016). Result The average RSI and RFS were respectively 10 and 4. The mean age of the patients in the study was 39 years and the mean weight was 60 kg. The association between RSI and PEPSIN detection is considered to be not statistically significant. Chi-squared equals 0.086 with 1 degree of freedom. The two-tailed P value equals 0.7698. Chi-squared equals 0.233 with 1 degree of freedom. The two-tailed P value equals 0.6295. The association between RFS and PEPSIN detection is considered to be not statistically significant. In terms of correlation analysis, neither the RSI nor the RFS had Pearson's correlation coefficient that was statistically significant. Conclusion Since salivary pepsin detection and the RSI do not have any significant correlation, the RSI is not a valid diagnostic method for LPR and should not be used exclusively.