Relationship Between Immune Profile and Respiratory Parameters in Down Syndrome Children with Acute Pneumonia: Pre-Intervention Analysis

Abstract

Background: Children with Down Syndrome (DS) exhibit immune dysregulation and increased susceptibility to severe pneumonia. While associations between immune status and infection risk are known, the relationship between specific baseline immune markers and respiratory parameters at the initial presentation of acute pneumonia in this population is unclear. Objective: To investigate the correlation between baseline serum immunoglobulin levels, white blood cell count (WBCs), and baseline respiratory parameters (respiratory rate and arterial oxygen saturation) in children with DS presenting with acute pneumonia. Material and methods: This descriptive, cross-sectional study analyzed baseline data from 40 children with DS and acute pneumonia enrolled prior to intervention in a larger trial. Baseline serum IgG, IgA, IgM (nephelometry), total WBC count (automated analyzer), RR (manual count), and SaO2 (pulse oximetry) were measured. Pearson or Spearman correlations were used to assess relationships between immune and respiratory variables, and with age. Statistical significance was set at p < 0.05. Results: Correlation analyses revealed no statistically significant linear relationships (p > 0.05 for all comparisons) between any of the baseline immune markers (IgG, IgA, IgM, WBCs) and the baseline respiratory parameters (RR, SaO2). Conclusion: In this cohort of young children with DS presenting with acute pneumonia, standard baseline systemic immune markers (IgG, IgA, IgM, WBC count) did not show significant linear correlation with concurrently measured respiratory parameters (RR, SaO2). This suggests complex interactions rather than simple associations between these variables at initial presentation.