The effect of bilateral carotid occlusion (BCO) on the activity of the vertebral and cardiac sympathetic efferent nerves was studied in gallamine-immobilized and artificially ventilated cats under chloralose urethane anesthesia. Electrical activity of the vertebral and cardiac nerves (VNA and CNA), their integram, arterial blood pressure and respiration were recorded. BCO led to an increase in VNA persisting throughout occlusion, while a merely transient increase took place in CNA. When blood pressure was kept at a constant level or the depressor nerves were transected, CNA responded to BCO with a lasting increase. Electrical stimulation of the central stump of the left depressor nerve inhibited CNA much more than VNA. It is assumed that the selective inhibition of CNA, after a transient increase, arises as a consequence of a rise in blood pressure, i.e. of consecutive aortic baroreceptor excitation.
|Number of pages||11|
|Journal||Acta physiologica Academiae Scientiarum Hungaricae|
|Publication status||Published - Dec 1 1975|
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