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Daily variability of forced oscillometry parameters in horses suffering recurrent airway obstruction, a pilot study

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Abstract

The aim of the study was to analyse the day-to-day variability of the respiratory resistance (Rrs) and the reactance (Xrs) in 5 horses in a status of remission of recurrent airway obstruction by forced oscillometry system (FOS). Furthermore, the effects of stabling, outdoor and room temperature and humidity on these parameters were determined. Mean Rrs at oscillation frequencies 1, 1.5, 2 and 3 Hz were all significantly higher in the morning than in the afternoon, while Xrs was not significantly affected by time of the day. Rrs was significantly different on various sampling days at all frequencies, in the morning as well as in the afternoon. Xrs showed the same significant differences for frequencies greater than 1 Hz. Overall, Rrs showed a smaller variability than Xrs. Neither outdoor temperature, nor room temperature affected Rrs. This also applied to Xrs except for the measurements at 2 Hz that were significantly (p = 0.044) affected by outdoor temperature. Turning out these horses at paddock for day and night caused a significant lower mean Rrs that when kept at stable for all night. While Rrs showed a very weak positive frequency dependency, Xrs clearly showed a positive frequency dependance for all horses. Resonance frequency (fres) was between 2 and 4 Hz. These studies showed that FOS generated parameters are affected by environmental and management factors and thus only after well-designed standardized procedures FOS could be a useful diagnostic tool for the diagnosis and monitoring of equine respiratory disorders.

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Acknowledgements

The authors thank Dr. Jutta Schaar for her help with the measurement and Dr. Klaus Riedelberger for his instruction on the handling of the MFOS equipment.

Conflict of interest statement

None of the authors of this paper has a financial or personal relationship with other people or organisations that could inappropriately influence or bias the content of the paper.

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Authors and Affiliations

  1. Department of Internal Medicine, Faculty of Veterinary Medicine, University of Erciyes, 38039, Kayseri, Turkey

    Ali Cesur Onmaz

  2. Department of Small Animals and Horses, Equine Clinic, Section Internal Medicine and Infectious Diseases, Veterinary University of Vienna, Vienna, 1210, Austria

    Christina Stoklas-Schmidt & René van den Hoven

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  1. Ali Cesur Onmaz
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  2. Christina Stoklas-Schmidt
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  3. René van den Hoven
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Correspondence to Ali Cesur Onmaz.

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Onmaz, A.C., Stoklas-Schmidt, C. & van den Hoven, R. Daily variability of forced oscillometry parameters in horses suffering recurrent airway obstruction, a pilot study. Vet Res Commun 37, 11–17 (2013). https://doi.org/10.1007/s11259-012-9541-y

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