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Summary

Low-grade systemic inflammation is associated with abnormal impulse oscillometry (IOS) results. This link persists even in individuals with normal spirometry, suggesting inflammation impacts peripheral airway function.

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Area of Science:

  • Pulmonary Medicine
  • Inflammation Research
  • Diagnostic Tools

Background:

  • Low-grade systemic inflammation is a known factor in abnormal spirometry.
  • Impulse oscillometry (IOS) is sensitive to peripheral airway dysfunction.
  • The relationship between systemic inflammation and IOS findings is not well-understood.

Purpose of the Study:

  • To investigate associations between systemic inflammation markers and IOS parameters.
  • To analyze relationships between C-reactive protein (CRP), blood eosinophils (B-Eos), neutrophils (B-Neu), lymphocytes (B-Lym), leukocytes (B-Leu), monocytes (B-Mono), and IOS.
  • To determine if inflammation impacts IOS independently of spirometry results.

Main Methods:

  • 10,602 adults (aged 50-65) from the Swedish CardioPulmonary bioImage Study (SCAPIS) were analyzed.
  • Blood biomarkers and IOS were assessed, with upper tertiles for CRP, B-Eos, B-Neu, B-Lym, B-Leu, and B-Mono defined.
  • Associations between elevated biomarkers and abnormal IOS indices (resistance, reactance, resonant frequency) were examined.

Main Results:

  • Abnormal IOS was found in 16.2% of participants; 33.8% of these also had abnormal spirometry.
  • Higher levels of multiple blood biomarkers were associated with abnormal IOS (OR 1.19-2.27).
  • Elevated biomarkers correlated with abnormal IOS even in individuals with normal spirometry (OR 1.43-1.75).

Conclusions:

  • Low-grade systemic inflammation is linked to abnormal impulse oscillometry (IOS).
  • This association remains evident even when spirometry results are normal.
  • Inflammation may contribute to peripheral airway dysfunction detectable by IOS.