Abstract
Background: Chronic rhinosinusitis (CRS) is one of the most common diseases of the upper respiratory tract, affecting 5-15% of the population in different regions worldwide. Despite decades of research, the exact pathogenesis of CRS remains debatable, and the role of the nasal microbiome requires detailed investigation.
Objective: To analyze and systematize current data (2018-2025) regarding the role of the nasal cavity and paranasal sinus microbiome in the pathogenesis of chronic rhinosinusitis and to conduct a meta-analysis.
Materials and Methods: A systematic search was conducted in PubMed, Scopus, Web of Science, Cochrane Library, and Google Scholar databases. Twenty-one studies meeting the inclusion criteria were selected. The quality assessment was performed using the Newcastle-Ottawa Scale for observational studies and the Cochrane Risk of Bias 2 tool for randomized controlled trials. A meta-analysis was conducted using a random-effects model. The quality of evidence was evaluated using the GRADE system.
Results: The meta-analysis revealed a statistically significant increase in the prevalence of Haemophilus influenzae in patients with CRS (OR: 2.00; 95% CI: 1.08-3.72; p=0.0276) and a decrease in the relative frequency of Corynebacterium spp. (mean difference: -5.44%; 95% CI: -8.88 to -2.00; p=0.0019). A significant reduction in bacterial diversity indices in CRS patients was established (SMD: -0.62; 95% CI: -0.90 to -0.34; p<0.0001). No statistically significant differences in the prevalence of Staphylococcus aureus were found between CRS patients and the control group; however, a strong positive correlation between Staphylococcus aureus levels and the proinflammatory cytokine IL-8 was identified (r=0.67; 95% CI: 0.55-0.76; p<0.0001).
Conclusions: The meta-analysis confirms the concept of microbial dysbiosis as an important pathogenetic mechanism in chronic rhinosinusitis. Reduced bacterial diversity, increased prevalence of Haemophilus influenzae, and decreased presence of commensal Corynebacterium spp. are characteristic features of microbiome changes in CRS. Different CRS phenotypes are characterized by specific microbial profiles, emphasizing the importance of a personalized approach to diagnosis and treatment.
Keywords: chronic rhinosinusitis, microbiome, dysbiosis, Staphylococcus aureus, Haemophilus influenzae, Corynebacterium, bacterial diversity, meta-analysis.