Why the study?
Does the cardiac index of parasympathetic activity predict death within a year in dogs with spontaneous heart disease?
Does the cardiac index of parasympathetic activity predict death within a year in dogs with spontaneous heart disease?
The cardiac index of parasympathetic activity provides a non-invasive, prognostically useful measure of mortality risk in dogs with heart disease.
In dogs with spontaneous heart disease, an electronically generated measurement of cardiac vagal tone, the cardiac index of parasympathetic activity, was a sensitive, simple and inexpensive measure of the severity of heart failure. Dogs with cardiac disease and an index score less than 3 were at 15.8 (95 per cent confidence interval 2.9 to 87.2) times the risk of dying within a year than those with a score of 3 and over. The measurement of the index provided an objective and reliable beat-by-beat measurement of cardiac vagal tone, which was prognostically useful in dogs with heart disease.
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Little et al. (2005) studied this question.
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