PMID: 8587326Nov 1, 1995Paper

Investigation of heart rate variability in a dog with upper respiratory tract obstruction

The Journal of Small Animal Practice
C J Little, P O Julu

Abstract

An eight-year-old bull mastiff presented with respiratory obstruction caused by a tumour dorsolateral to the larynx. Removal of the tumour was attempted but the dog died. A novel noninvasive measurement of heart rate variability and cardiac parasympathetic activity, recorded real-time from an electrocardiograph signal, was used to investigate cardiac rhythm in the dog. A simultaneous record of heart rate and cardiac parasympathetic activity showed severe sinus arrhythmia caused by the parasympathetic tone, in which the inspiratory heart rate exceeded 140 beats per minute (bpm) and the expiratory heart rate fell to below 60 bpm. The extent of respiratory modulation of the cardiac parasympathetic activity (vagal tone) has not been reported before using this technique on-line in a conscious, freely-behaving and spontaneously breathing animal. Non-invasive measurements of cardiac parasympathetic tone show great potential for the assessment of animals with systemic and cardiac disease including cardiac failure.

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Citations

Jun 1, 2005·Journal of Feline Medicine and Surgery·Jonathan A Abbott
Jun 8, 1999·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·R S DelamontG A Jamal
Apr 8, 2020·Journal of Veterinary Research·Radu Andrei BaisanVasile Vulpe

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