Inappropriate sinus tachycardia (IST) is a rare cardiac disturbance documented in humans in which the sinus heart rate is inappropriately elevated without an obvious cause or trigger. It is characterised by a rhythm originating in the sinus node with a heart rate above normal at rest without the influence of drugs, pain, cardiac or extracardiac disease. IST may be caused by abnormal structure or function of the sinus node or abnormal function of the autonomous nervous system. This report describes the case of a young dog with a resting heart rate of 140 bpm with electrocardiographic characteristics consistent with sinus tachycardia. Additional cardiac or extracardiac disorders were not identified and the dog was otherwise healthy and not receiving any medication. These findings were suggestive of IST.
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Contributors PMPO and HA were responsible for case management. AM analysed the Holter recordings. All authors contributed to the written report.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement Requests for access to data may be addressed to the corresponding author.
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