Influence of subclinical inflammatory airway disease on equine respiratory function evalueated by impulse oscillometry

[en] Reasons for performing study: Inflammatory airway disease (IAD) is a nonseptic condition of the lower respiratory tract. Its negative impact on respiratory function has previously

been described using either forced expiration or forced oscillations techniques. However, sedation or drug-induced bronchoconstriction were usually required. The impulse

oscillometry system (IOS) is a noninvasive and sensitive respiratory function test validated in horses, which could be useful to evaluate IAD-affected horses without further

procedures.

Objectives: To determine the sensitivity of IOS in detecting alterations of the respiratory function in subclinically IAD-affected horses without inducing bronchoprovocation and to characterise their respiratory impedance according to frequency for each respiratory phase.

Methods: Pulmonary function was evaluated at rest by IOS in 34 Standardbred trotters. According to the cytology of bronchoalveolar lavage fluid (BALF), 19 horses were defined

as IAD-affected and 15 horses were used as control (CTL). Total respiratory resistance (Rrs) and reactance (Xrs) from 1–20 Hz as well as their inspiratory and expiratory

components were compared between groups.

Results: A significant increase of Rrs at the lower frequencies (R1–10 Hz) as well as a significant decrease of Xrs beyond 5 Hz (X5–20 Hz) was observed in IAD compared to CTL horses. IOS-data was also significantly different between inspiration and expiration in IAD-affected horses. In the whole population, both BALF eosinophil and mast cell counts were

significantly correlated with IOS measurements.

Conclusions: Functional respiratory impairment may be measured, even in the absence of clinical signs of disease. In IAD-affected horses, the different parameters of respiratory

function (Rrs or Xrs) may vary depending on the inflammatory cell profiles represented in BALF.

Potential relevance: Impulse oscillometry could be used in a routine clinical setting as a noninvasive method for early detection of subclinical respiratory disease and of the results

of treatment in horses.

Disciplines :

Anatomy (cytology, histology, embryology...) & physiology
Veterinary medicine & animal health

Author, co-author :

Richard, Eric ; Frank Duncombe Laboratory > Animal Health > Research and Development

Fortier, Guillaume; Frank Duncombe Laboratory > Animal Health > Head

Denoix, Jean-Marie

Art, Tatiana ; Université de Liège - ULiège > Département de sciences fonctionnelles > Phys. neuro-muscul., de l'effort - Méd. sport. des animaux

Lekeux, Pierre ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie - Doyen de la Faculté de Médecine vétérinaire

Van Erck, Emmanuelle

Language :

English

Title :

Influence of subclinical inflammatory airway disease on equine respiratory function evalueated by impulse oscillometry

Publication date :

2009

Journal title :

Equine Veterinary Journal

ISSN :

0425-1644

eISSN :

2042-3306

Publisher :

Equine Veterinary Journal Ltd, Newmarket Suffolk, United Kingdom

Volume :

Issue :

Pages :

384-389

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 15 May 2009

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