Studies on the hemodynamic changes induced by electrical stimulation of the vagosympathetic trunks in the dog

Franco Rengo, Massimo Chiariello, Lorenzo de Caprio, Luigi Saccà, Bruno Trimarco, Gavino Perez, Mario Condorelli

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of electrostimulation of the cephalic endings of the vagosympathetic trunks on the systemic and perfusion pressure of the hind limb of the dog depend upon frequency, intensity and duration of the stimulus. The electro-stimulation performed with stimuli of high frequency, low intensity and moderately long duration (rectangular waves of 1.5 V, 0.7 msec, 100 Hz) consistently elicited systemic hypertension and vasoconstriction. This response was completely abolished by pretreatment with guanethidine or hexamethonium. On the other hand, electrostimulation with stimuli of low frequency, high intensity and long duration (5 V, 1 msec, 10 Hz) produced systcmic hypotension and vasodilatation in the perfused hind limb. These effects were completely blocked by atropine or hexamethonium, while guanethidine was unable to induce any modification. These findings suggest that electrostimulation of vagosympathetic trunks can evoke different hemodynamic responses depending upon the characteristics of the stimulus. The occurrence of a vasodilatation specifically blocked by atropine demonstrates that a purely cholinergic mechanism underlies such a reflex response.

Original languageEnglish
Pages (from-to)98-112
Number of pages15
JournalCardiology
Volume60
Issue number2
DOIs
Publication statusPublished - 1975

Keywords

  • Atropine
  • Guanethidine
  • Hexamethonium
  • Perfused dog hindlimb
  • Reflex vasodilatation

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Pharmacology (medical)

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