ArticleJournal of veterinary internal medicine2026
Evaluation of clinical, ultrasonographic, and clinicopathological findings in dogs with pituitary-dependent hypercortisolism and poor trilostane response.
Article in Journal of veterinary internal medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
backgroundTrilostane is the treatment of choice for pituitary-dependent hypercortisolism (PDH) in dogs, but predictors of a poor response are unclear. HYPOTHESIS/
objectivesTo identify variables associated with a poor response to trilostane in dogs with PDH. ANIMALS: Twenty-three dogs with PDH treated with trilostane.
methodsRetrospective cohort study. Clinical, clinicopathological, endocrine, ultrasonographic, and treatment data were reviewed. Dogs were classified as good responders (GRs) or nonresponders (NRs) based on clinical outcomes after 4-8 months of trilostane treatment. The primary outcome was treatment response.
resultsFifteen dogs were GRs and 8 were NRs. At diagnosis, GRs had lower alanine aminotransferase (ALT) (median [IQR] 182 [70-251] vs 330 [224-578] U/L; P = .004), eACTH (14.4 [9.25-29.13] vs 49.2 [34.35-62.35] pg/mL; P = .007), and pre-ACTH cortisol (4.28 [3.07-6.52] vs 9.0 [6.57-19.40] μg/dL; P = .019) than NRs. Bilateral adrenomegaly was more frequent in NRs (8/8) than in GRs (9/15; P = .007). At T1, NRs required more rechecks (median [IQR] 7 [6-7] vs 3 [3-5]; P < .001) and higher trilostane doses (3.25 [3-5.75] vs 1.22 [0.66-1.60] mg/kg q12h; P < .001). After false discovery rate adjustment, ALT, eACTH, alopecia, and bilateral adrenomegaly remained significant (q = 0.047 for each). All GRs achieved complete clinical resolution within 4 months of treatment initiation. CONCLUSIONS AND CLINICAL IMPORTANCE: Higher baseline ALT, eACTH, and pre-ACTH cortisol, as well as bilateral adrenomegaly, were associated with a poor response to trilostane. A lack of improvement by 4-8 months and the need for higher doses or more rechecks supports early therapeutic reassessment.
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