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J Vet Sci 2018; 19(4): 563-569  https://doi.org/10.4142/jvs.2018.19.4.563
Influence of bronchoalveolar lavage on thoracic radiography in the horse
Ann K. Barton1,*, Thorben Schulze1, Marcus G. Doherr2, Heidrun Gehlen1
1Equine Clinic and 2Institute for Veterinary Epidemiology & Biostatistics, Freie Universitaet Berlin, 14163 Berlin, Germany
Correspondence to: Tel: +49-30-83862299; Fax: +49-30-838462529; E-mail: Ann-Kristin.Barton@fu-berlin.de
Received: August 24, 2017; Revised: February 19, 2018; Accepted: February 20, 2018; Published online: July 31, 2018.
Bronchoalveolar lavage (BAL) and thoracic radiography are routinely performed diagnostic procedures. We hypothesized that BAL increases the interstitial opacity of caudoventral and caudodorsal thoracic radiographs. Fifty-three horses, including 8 clinic owned and 45 from a referral hospital population, were classified as healthy controls (n = 12), severe equine asthma (recurrent airway obstruction, n = 12) or mild-to-moderate equine asthma (inflammatory airway disease, n = 21) based on the results of a clinical scoring system. Eight were excluded due to different diagnoses and poor image quality. Four randomized thoracic radiographs of each horse were scored by two blinded observers, who were also asked to identify the image as obtained before or after a BAL procedure. In severe equine asthma, the chance (adjusted odds) of misinterpretation of the correct imaging time was approximately 5 times higher than in controls (odds ratio [OR] = 5.373, p = 0.028). The chance of misinterpretation was approximately 4 times lower in caudodorsal images than in caudoventral projections (OR = 0.241, p = 0.004). Identification of the correct imaging time was highly correlated with an increase in interstitial opacity (OR = 9.976, p < 0.0001). In conclusion, we recommend performing BAL after thoracic radiography to avoid possible misinterpretation.
Keywords: bronchoalveolar lavage, horses, lung, respiratory tract diseases, thoracic radiography

© 2018 The Korean Society of Veterinary Science.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.