Usefulness of Pep-Test for Laryngo-Pharyngeal Reflux: A Pilot Study in Primary Care
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Background: Gastroesophageal reflux disease is a digestive disorder characterized by nausea, regurgitation, and heartburn. Gastroesophageal reflux is the primary cause of laryngeal symptoms, especially chronic posterior laryngitis. The best diagnostic test for this disease is esophageal impedance-pH monitoring; however, it is poorly employed owing to its high cost and invasiveness. Salivary pepsin measured using a lateral flow device (Pep-test) has been suggested as an indirect marker of laryngopharyngeal reflux (LPR). The present study tested the reliability of Pep-test in diagnosing LPR in uninvestigated primary care attenders presenting with chronic laryngeal symptoms, and evaluated the raw pepsin concentration in patients with LPR. Methods: A multicenter, non-interventional pilot study was conducted on 86 suspected patients with LPR and 59 asymptomatic subjects as controls in three Italian primary care settings. A reflux symptom index questionnaire was used to differentiate patients with LPR (score >13) from controls (score <5). Two saliva samples were collected, and comparisons between the groups were performed using two-sided statistical tests, according to variable distributions. Results: There was no statistical difference in the salivary pepsin positivity between LPR patients and controls, whereas the pepsin intensity value was higher in controls than in LPR patients. Conclusion: A high prevalence of pepsin positivity was observed in asymptomatic controls. Pepsin measurement should not be considered as a diagnostic test for LPR in primary care patients.
Abstract
Background: Gastroesophageal reflux disease is a digestive disorder characterized by nausea, regurgitation, and heartburn. Gastroesophageal reflux is the primary cause of laryngeal symptoms, especially chronic posterior laryngitis. The best diagnostic test for this disease is esophageal impedance-pH monitoring; however, it is poorly employed owing to its high cost and invasiveness. Salivary pepsin measured using a lateral flow device (Pep-test) has been suggested as an indirect marker of laryngopharyngeal reflux (LPR). The present study tested the reliability of Pep-test in diagnosing LPR in uninvestigated primary care attenders presenting with chronic laryngeal symptoms, and evaluated the raw pepsin concentration in patients with LPR. Methods: A multicenter, non-interventional pilot study was conducted on 86 suspected patients with LPR and 59 asymptomatic subjects as controls in three Italian primary care settings. A reflux symptom index questionnaire was used to differentiate patients with LPR (score >13) from controls (score <5). Two saliva samples were collected, and comparisons between the groups were performed using two-sided statistical tests, according to variable distributions. Results: There was no statistical difference in the salivary pepsin positivity between LPR patients and controls, whereas the pepsin intensity value was higher in controls than in LPR patients. Conclusion: A high prevalence of pepsin positivity was observed in asymptomatic controls. Pepsin measurement should not be considered as a diagnostic test for LPR in primary care patients.
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