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The respiratory system is essential for health and high athletic performance in horses. Respiratory diseases have been recognized as having a major impact on training equine animals and are commonly cited as the second most common cause of wasted training time. Inflammatory airway disease (IAD) is an important cause of poor performance in young racehorses. Exercise-induced pulmonary hemorrhage (EIPH) is considered a major issue for the equine industry because of its high prevalence and association with reduced athletic performance. In Brazil, polo is a growing equestrian sport, but studies on it are still scarce. The aim of this study was to evaluate the occurrence of EIPH, the association between EIPH and IAD, and EIPH influence on the tracheal cytological profile of polo ponies. Thirty-seven horses regularly used for polo were included in this study. Endoscopic examination was performed every 30 to 90 min after practice, and tracheal lavage was performed after 18 to 24 hr. Sixteen animals (43.2%) presented a score of 0 for mucus in endoscopy; twelve animals (32.4%) presented a score for 1 and nine animals (24.3%) presented score 2 of mucus. IAD was characterized by tracheal cytology in 12 animals (32.4%). The occurrence of EIPH in this study was 29.7% (11/37). No significant difference was found in the cell types in tracheal cytology when EIPH-positive and EIPH-negative horses were compared. Polo ponies are affected by IAD and EIPH in relevant proportions, but there was no association between EIPH and tracheal cytological profile.

Association between exercise-induced pulmonary hemorrhage and inflammatory airway disease in polo ponies