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The coherence between the frontal-parietal cortex and cardiac sympathetic nerve activity in cats

Huang Zhongsun

Department of Physiology, Chongqing University of Medical Sciences. Chongqing 630046, Sichuan

Abstract

Experiments were performed on 86 cats anesthetized with chloralose, paralyzed with gallamine triethiodide and ventilated artifically. Autospectral and coherence analysis revealed that the frontal-parietal cortex activity(EEG)and cardiac sympathetic nerve discharge(SND)were remarkably correlated in 34/44 cats. SND lagged EEG by 50±20 ms with a cross-correlation value of 0.4±0.1. Coherence value was 0.25±0.05, indicating a statistically significant relationship between the two signals. Midbrain transection at sterotaxic plane A_(3) preferentially decreased SND power at frequencies 3-4.2 Hz, accompanied by a fall in mean blood pressure (5.47±0.13kPa). The coherence of SND to EEG was eliminated after decerebration. However, the total power in EEG was notsignificantly affected. The SND rhythm and blood pressure returned nearly to control level within 1 h after decerebation. The effects of midbrain transection were significantly attenuated by prior minor lesionings of the lateral hypothalamus or medial thalamus.

Key words: Sympathetic nerve rhythm;Electroencephalon;Decerebration;Coherence analysis

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Citing This Article：

Huang Zhongsun. The coherence between the frontal-parietal cortex and cardiac sympathetic nerve activity in cats. Acta Physiol Sin 1996; 48 (1): (in Chinese with English abstract).