In 27 anesthetized cats, histograms of the ECG respiratory cycle phases distribution revealed that in 89% of cases the histograms were significantly non-uniform. The heart rate (HR) was relatively constant: high probability of respiratory phases switching was conditioned by the HR influences on respiratory rhythm. The intensity of such influence was about 10% on the average. The influence of cardiac rhythm on respiratory rhythm was caused by relatively weak signals. The closer the relation of HR to respiratory rate (f) to whole figures, the higher the probability of cardiac rhythm influence on respiratory phases switching.
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