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Cui Hong

First Clinical Institute，China Medical University. Shenyang 110001,Liaoning, China

Abstract

Experiments were performed on rabbits anaesthetized with urethane and chloralose.The electrocardiogram(ECG), heart rate (HR), and blood pressure(BP) wererecorded and the power spectrum density (PSD) of R-R interval was analysed by acomputer. The low frequency component (LF) was higher during the respectivestimulation of the nucleus ambiguus, depressor nerve, and the peripheral end of rightvagus with a low frequency fluctuant style than with a monotonous style (P<0.05).Intravenous infusion of phenylephrine resulted in increases of total variance of RRI (TV),very low frequency components (VLF), LF, high frequency components (HF) and LF/HF during the first 256 RRI only (P<0.05~0.01). In order to observe the influence ofdifferent activities of sympathetic nerves on heart rate variability (HRV), DLhomocysteine(DLH) was microinjected into the vicinity of N. Paraventricularis ofhypothalamus.

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Citing This Article：

Cui Hong. . Acta Physiol Sin 1998; 50 (5): (in Chinese with English abstract).