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Association between changes in blood eosinophil levels and alterations in olfactory function in asthma.

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Asthma patients show changes in smell function linked to blood eosinophil levels. Higher eosinophils correlate with declining olfactory function, suggesting a connection between inflammation and smell in asthma.

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Area of Science:

  • Respiratory Medicine
  • Neurology
  • Otolaryngology

Background:

  • Olfactory dysfunction is a known comorbidity in asthma.
  • The underlying mechanisms linking asthma and smell impairment remain unclear.

Purpose of the Study:

  • To investigate the relationship between olfactory function changes and clinical parameters in asthma patients.
  • To explore potential biomarkers associated with olfactory decline in asthma.

Main Methods:

  • Prospective study of 30 moderate to severe asthma patients.
  • Olfactory function assessed using the YSK Olfactory Function Test over 6 months.
  • Clinical parameters, including blood eosinophil levels, were analyzed in relation to olfactory changes.

Main Results:

  • Patients were categorized into olfactory-improvement (n=9), olfactory-stable (n=15), and olfactory-decline (n=6) groups.
  • Blood eosinophil levels progressively increased from the improvement to the decline groups.
  • No significant differences were observed in upper airway diseases, intranasal steroid use, asthma control, or medications.

Conclusions:

  • Blood eosinophilic inflammation may be associated with olfactory function in asthma patients.
  • Further research is warranted to elucidate the mechanisms connecting eosinophilic inflammation and olfactory dysfunction in asthma.