Changes in systolic blood pressure in dogs with pituitary dependent hyperadrenocorticism during the first year of trilostane treatment

Abstract

Background: Systemic hypertension (SH) is common in dogs and humans with hypercortisolism and can persist after treatment. Objectives: To evaluate changes in prevalence of SH and systolic blood pressure(SBP) in dogs with pituitary-dependent hyperadrenocorticism (PDH) during the first year of trilostane treatment, its relationship with disease control and selected laboratory variables, and their response to antihypertensive treatment. Animals: Fifty-one dogs with PDH treated with trilostane Q12h. Methods: Prospective case series study. Dogs were evaluated at diagnosis (T0) and1, 3, 6, and 12 months (T12). Dogs were classified as non hypertensive(SBP < 160 mm Hg) or hypertensive (SBP≥160 mm Hg) and subclassified according to target organ damage (TOD) risk. Hypertensive dogs were treated with benazepriland, if control of SH was not achieved, amlodipine was added. Results: Prevalence of SH decreased from T0 (36/51) to T12 (17/37; P = .01).Changes in SBP during the study were influenced by the risk of TOD at T0. In severely hypertensive (SBP ≥ 180 mm Hg) dogs, the decrease in SBP was more pronounced whereas in normotensive (SBP < 140 mm Hg) dogs SBP increased slightly(P = .00). Blood pressure was not associated with disease control. Antihypertensive treatment was needed in 31/51 dogs, and in 13/31 dogs additional SH control with amlodipine was required. One third of non hypertensive dogs at T0 required treatment with benazepril because SH developed during follow-up. Conclusions and Clinical Importance: In dogs with PDH, SBP should be measured atevery visit, regardless of disease control or SBP at diagnosis. More than 1 drug may be necessary to manage SH in affected dogs.