Difference between intracarotid and intravenous infusions of angiotensin II on baroreflex sensitivity and vasopressin release in conscious rats

F.J. Fenoy
M. Ubeda
J. García-Estañ
T. Quesada
66

Abstract

A carotid infusion of angiotensin (AII) (10 ng/kg/min) has been found to increase significantly higher mean arterial pressure (MAP) and produces significantly lower bradycardia than AII intravenous infusions at the same dose and rate.Besides, i.v.administration of AII elicits greater impairment on baroreflex sensitivity than carotid infusion of AII does.On the other hand, vasopressin vascular receptor blockade did not modify the baroreflex sensitivity either in the carotid or in the i.v.infusions of AII, and plasma AVP measurements did not change significantly in any group.It clearly indicates that neither AVP nor baroreflex impairment plays any role on the pressor action of AII intracarotid infusions at a low dose.The present results further suggest that baroreflex impairment in rats may unlikely be located in the region irrigated by the carotid artery.

Keywords:
Angiotensin II/pharmacology, Animals, Blood Pressure/drug effects, Carotid Arteries, Heart Rate/drug effects, Inbred Strains, Infusions, Injections, Intra-Arterial, Intravenous, Male, Pressoreceptors/drug effects, Rats, Vasopressins/blood/pharmacology

Authors

F.J. Fenoy
M. Ubeda
J. García-Estañ
T. Quesada


Metrics

Search GoogleScholar



Downloads

Download data is not yet available.

Section

Articles

Most read articles by the same author(s)

1 2 > >>