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Canine pituitary-dependent hypercortisolism (PDH) management with trilostane usually demands lifelong therapy. The greater the dose needed, the greater the risk of side effects. Selegiline therapy has been previously described but not commonly used for PDH treatment. The present work aimed to assess the efficacy of selegiline and trilostane combined therapy for canine PDH treatment. Fifteen client-owned dogs diagnosed with spontaneous PDH were enrolled. The patients were treated with trilostane (Tri group, n = 8, initial dose of 0.5 mg/kg, PO, q12h), or with trilostane and selegiline (Tri + Sel group, n = 7, initial trilostane dose of 0.5 mg/kg, PO, q12h and selegiline 1 mg/kg, PO, q24h). Dogs underwent clinical examination, serum biochemical analysis, urinalysis, abdominal ultrasound, and eACTH and post-ACTH cortisol measurements on treatment days zero (D0), 30 (D30), 90 (D90), and 180 (D180). There was a lack of adverse effects due to the combined therapy. Both groups showed a similar clinical response and lower post-ACTH cortisol levels at the study's end. There was no significant difference in trilostane dosage at D180 between groups. There was no documented increase in either right or left adrenal gland thickness in the Tri + Sel group in contrast with patients in the Tri group. However, there was no statistical difference between the groups regarding eACTH at D0 and D180. Patients in the Tri + Sel group achieved better serum triglycerides control at the end of the study. The association of selegiline with trilostane might be a feasible therapy for canine PDH; however, its eventual advantages need larger studies. |
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