Influence of subclinical inflammatory airway disease on equine respiratory function evaluated by impulse oscillometry.
Authors: Richard E A, Fortier G D, Denoix J-M, Art T, Lekeux P M, Van Erck E
Journal: Equine veterinary journal
Summary
Subclinical inflammatory airway disease (IAD) is increasingly recognised as a significant constraint on equine respiratory performance, yet traditional diagnostic methods often require sedation or pharmacological challenge to detect functional impairment. This study employed impulse oscillometry (IOS)—a noninvasive technique that measures airway resistance and compliance through small pressure oscillations during quiet breathing—to assess whether horses with subclinical IAD demonstrated measurable respiratory dysfunction compared to unaffected controls. The IOS system proved sensitive enough to detect elevated respiratory resistance and reduced compliance in IAD-affected horses without requiring sedation or bronchoconstriction induction, offering clear mechanistic evidence that subclinical disease compromises airway mechanics even when clinical signs remain absent. For practitioners, this work validates IOS as a practical diagnostic tool that could support earlier identification of subtle respiratory dysfunction in performance horses, potentially informing training decisions and therapeutic interventions before overt clinical deterioration occurs. Given the widespread prevalence of subclinical IAD in sport horses, accessibility to validated, non-invasive assessment methods may help differentiate performance limitations attributable to respiratory compromise from other causes.
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Practical Takeaways
- •IOS offers a practical, noninvasive screening tool for equine respiratory disease that doesn't require sedation or medication challenges, making it suitable for field or routine clinic evaluations
- •Early detection of subclinical IAD using IOS may allow earlier intervention before clinical signs develop and performance is significantly impacted
- •This technique provides objective measurement of airway disease severity independent of patient cooperation or behavioral factors
Key Findings
- •Impulse oscillometry system (IOS) is a noninvasive technique validated in horses for detecting respiratory function changes
- •IOS can evaluate inflammatory airway disease without requiring sedation or drug-induced bronchoconstriction
- •IOS demonstrates sensitivity in detecting subclinical airway inflammation affecting respiratory function