Abstract
The aim of this study was to investigate the levels of circulating immune complexes (CICs) and concentration of haptoglobin, fibrinogen and C-reactive protein in the serum of horses with recurrent airway obstruction and healthy controls. The study was conducted on a group of 14 adult Polish Konik horses, kept in uniform environmental and living conditions. Horses were divided into two groups: 7 horses were not affected by any respiratory problem (control group) and 7 horses had a history of recurrent airway obstruction (RAO) (study group). A clinical and laboratory evaluation, endoscopic examination and bronchoalveolar lavage (BAL) were performed in all horses. Levels of circulating immune complexes were significantly (p = 0.0057) increased in heaves-affected horses compared to healthy controls (median [25th-75th percentiles]) (3.96 [3.96-4.43] vs. 7.46 [5.13-11.9]). No significant difference was observed in the levels of the examined acute phase proteins between the groups. Moreover, all results were within the reference range established for horses. The results of this study indicate that heaves in horses is associated with the formation and high level of CICs. Haptoglobin, fibrinogen and C-reactive protein failed as markers of early stage systemic inflammation in the course of RAO.
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