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QT interval instability and variability in dogs with naturally-occurring hypercortisolism

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Abstract

Hypercortisolism is one of the most common endocrine diseases in dogs. In humans, it is clearly associated with a higher risk of cardiovascular events, but studies in dogs are scarce. To investigate the arrhythmogenic risk of dogs with naturally-occurring hypercortisolism (NOHC), indices of variability and instability of the QT interval were retrospectively studied in 38 dogs with NOHC and prospectively studied in 12 healthy dogs: variance (QTv), total instability (TI), short-term (STI) and long-term (LTI), and mean (QTm). Except for QTm, all parameters studied were higher in the NOHC group than in the control group. In addition, STI and QTv showed moderate positive correlation with left ventricle wall thickness. The NOHC group was subdivided according to cortisol suppression pattern in the low-dose dexamethasone suppression test. All electrocardiographic indices of partial and absent suppression patterns were numerically higher than healthy dogs. QTv and TI were lower in the control group than in both NOHC subgroups. LTI and STI were lower in the CG than in the group with the partial suppression pattern. There was no statistical difference between sex groups in any of the electrocardiographic parameters studied. This result might indicate that the etiology of NOHC, and its consequent influence on hypothalamus–pituitary–adrenal axis could interfere on the heterogeneity of ventricular repolarization parameters in different ways, especially in the short-term and the long-term stability; however further studies are necessary to understand the role of cortisol on electrical instability in dogs.

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Notes

  1. ECG-PC, Teb, São Paulo, São Paulo, Brazil.

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Funding

This research was supported by Coordination of Superior Level Staff Improvement (CAPES), Brazil.

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Contributions

Beatriz de Carvalho Pato Vila, Marcela Sigolo Vanhoni, and Marlos Gonçalves Sousa contributed to acquisition of the data, participated in the statistical analysis, and wrote and edited the manuscript.

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Correspondence to Beatriz de Carvalho Pato Vila.

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The study was entirely conducted in a Veterinary Teaching facility following the guidelines outlined in the National Institutes of Health Guide for the Care and Use of Laboratory Animals.

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Due to the retrospective nature of this investigation, institutional policies do not require a written consent of animal owners prior to inclusion of data in the study, as well as to publish manuscripts.

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Due to the retrospective nature of this investigation, institutional policies do not require a written consent of animal owners prior to inclusion of data in the study, as well as to publish manuscripts.

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The authors have no conflict of interest to disclose.

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Vila, B.d.P., Vanhoni, M.S. & Sousa, M.G. QT interval instability and variability in dogs with naturally-occurring hypercortisolism. Vet Res Commun 47, 121–130 (2023). https://doi.org/10.1007/s11259-022-09936-1

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  • DOI: https://doi.org/10.1007/s11259-022-09936-1

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