Sino-aortic denervation in the monkey.
The aortic arch and carotid sinuses were denervated in eleven monkeys. The monkeys were subjected to four sequential surgeries which involved: (1) implantation of an aortic and left atrial catheter; (2) stripping of the adventitia from the aortic arch; (3) stripping the left carotid sinus and associated vessels; and (4) stripping the right carotid sinus and associated vessels. Blood pressure and pulse rate were recorded 6 days after each surgical procedure. Records were taken over a 6 h period while the monkeys were in their home cages. Baroreceptor denervation was confirmed by: (1) absence of heart rate response to blood pressure changes and (2) an increase in the variability of blood pressure. Veratridine given into the left atrium caused a Bezold-Jarisch reflex both before and after denervation verifying the integrity of the afferent and efferent vagus. Denervation of the baroreceptors resulted in a significant increase in blood pressure when measured from monkeys who were restrained in chairs in the laboratory; however, blood pressure was not significantly elevated in the baroreceptor denervated monkeys while they were tethered in their home cages. It is concluded that denervation of the sino-aortic baroreceptor does not result in a significant increase in systemic blood pressure.
D000818:Animals; D001013:Aorta, Thoracic / Q000294:innervation*; D001794:Blood Pressure / Q000187:drug effects; D002346:Carotid Sinus / Q000294:innervation*; D003714:Denervation; D006339:Heart Rate / Q000187:drug effects; D008252:Macaca fascicularis; D008253:Macaca mulatta; D010215:Papio; D011311:Pressoreceptors / Q000502:physiology; D013997:Time Factors; D014701:Veratridine / Q000494:pharmacology
D014701:Veratridine