Bronchoalveolar lavage fluid neutrophilia is associated with the severity of pulmonary lesions during equine asthma exacerbations.
Authors: Bullone M, Joubert P, Gagné A, Lavoie J-P, Hélie P
Journal: Equine veterinary journal
Summary
# Editorial Summary During acute exacerbations of equine asthma, neutrophilic airway inflammation—detected via bronchoalveolar lavage fluid (BALF) cytology—correlates directly with the extent of structural damage to small airways and lung tissue, providing clinicians with a non-invasive biomarker of disease severity. Bullone and colleagues examined horses experiencing naturally occurring asthma exacerbations, using BALF cytology to quantify neutrophils and correlating these findings with histopathological assessment of lung lesions including airway wall remodelling, mucus accumulation, and parenchymal changes. The research demonstrated a strong association between elevated neutrophil percentages in BALF and the degree of pulmonary pathology; notably, neutrophil counts effectively predicted both peripheral airway injury and alveolar involvement, with higher neutrophilia indicating more extensive structural compromise. These findings validate BALF cytology as a practical diagnostic tool for assessing disease progression and guiding treatment intensity during acute episodes, whilst highlighting the inflammatory underpinnings of tissue destruction in severe equine asthma. For practitioners managing asthmatic horses, this work reinforces the value of sampling during clinical exacerbations to quantify airway neutrophilia, offering objective evidence to justify intensive anti-inflammatory protocols and potentially inform prognosis regarding long-term airway remodelling.
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Practical Takeaways
- •BALF neutrophil percentage provides a quantifiable marker of airway disease severity in asthmatic horses, helping clinicians assess exacerbation severity
- •Elevated neutrophilia on BALF cytology indicates ongoing structural damage to airways and lung tissue, warranting aggressive treatment and management intervention
- •Serial BALF neutrophil monitoring may help guide treatment decisions and assess response to therapy in horses with recurrent airway obstruction
Key Findings
- •Bronchoalveolar lavage fluid neutrophilia correlates with severity of pulmonary lesions during equine asthma exacerbations
- •Pathological changes in peripheral airways and pulmonary parenchyma are associated with neutrophil percentages in airway lumen
- •BALF cytology neutrophil counts can be used as a biomarker for assessing structural airway damage in equine asthma