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Objective— To evaluate the postoperative inflammatory response of horses to elective surgery of varying intensity.

Study Design— Prospective longitudinal study.

Animals— Horses referred to 2 hospitals for either arthroscopic removal of a unilateral osteochondritic lesion in the tibiotarsal joint (minimal surgical trauma, n=11), correction of recurrent laryngeal neuropathy by laryngoplasty and ventriculectomy (intermediate surgical trauma, n=10) or removal of an ovarian tumor by laparotomy (major surgical trauma, n=5).

Methods— Horses had a thorough clinical examination every day. White blood cell (WBC) counts and concentrations of serum amyloid A (SAA), fibrinogen, and iron were assessed in blood samples obtained before, and 1–3, 5, 7, 9, and 11 days after surgery. Differences in levels of the inflammatory markers between the 3 surgical groups were analyzed using repeated measures ANOVA.

Results …