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BACKGROUND: Laryngopharyngeal reflux (LPR), allergic rhinitis (AR), and asthma are common airway disorders that often coexist, suggesting shared inflammatory mechanisms. LPR involves gastric reflux into the laryngopharynx, while AR and asthma are linked by the "united airway" hypothesis. Evidence indicates LPR may contribute to AR and asthma exacerbation, yet their interactions remain unclear. Understanding their interaction may enhance clinical outcomes. OBJECTIVE: This systematic review aimed to evaluate the associations between LPR, AR, and asthma by analyzing studies that examined these conditions in various patient populations. METHODOLOGY: A comprehensive search of electronic databases, including PubMed, Scopus, and Google Scholar, was conducted for studies published up until 2024. Eligible studies were selected based on predefined inclusion criteria, and data on the prevalence, diagnostic methods, and associations between LPR, AR, and asthma were extracted. This systematic review was conducted and registered in PROSPERO (CRD42024588367). Statistical analysis was performed to determine the strength of the associations between these conditions. RESULTS: The review identified significant associations between LPR and both AR and asthma. Multiple studies confirmed a positive correlation between LPR and AR, with worse AR symptoms observed in patients with more severe LPR. Additionally, a strong association between LPR and asthma was observed, particularly in patients with poorly-controlled asthma. The analysis also revealed a robust relationship between AR and asthma, consistent with the "united airway" hypothesis, which posits that the upper and lower airways share common inflammatory pathways. These findings suggest that the coexistence of these conditions may exacerbate symptoms and complicate management. CONCLUSION: This systematic review highlights the significant associations between LPR, AR, and asthma, emphasizing the importance of recognizing and addressing these comorbidities in clinical practice. The findings suggest that managing 1 condition may have a beneficial effect on the others, supporting a multidisciplinary approach to diagnosis and treatment.
Awad et al. (Sun,) studied this question.