Effect of bleeding, cooling and asphyxia on the activity of vertebral and cardiac sympathetic nerves

M. Kollai, L. Fedina, A. G.B. Kovach

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Abstract

The effect of different factors influencing sympathetic efferent activity has been studied in order to find differences in regional sympathetic outflow. The experiments were performed on anaesthetized cats; integrated vertebral nerve activity (VNA), cardiac nerve activity (CNA), systemic blood pressure and respiration were recorded. During gradual, step wise bleeding the increase of VNA exceeded that of CNA in all phases of bleeding. As a result of cooling the surrounding air from 30 to 15° C, VNA and CNA displayed a slight increase; on further cooling to 10° C, a steep rise of the activity level occurred in VNA. In the course of 1 min asphyxia VNA increased steadily and considerably while the increase in CNA began later and was slighter than that of VNA. The results revealed that the cardiac and vertebral sympathetic nerves give quantitatively different responses to the stimuli applied.

Original languageEnglish
Pages (from-to)145-155
Number of pages11
JournalActa physiologica Academiae Scientiarum Hungaricae
Volume44
Issue number2
Publication statusPublished - Dec 1 1974

ASJC Scopus subject areas

  • Physiology

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