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Effects of clonidine on the experimental hypertension by abdominal aortic coarctation in rats.

Abstract：

:Cardiovascular baroreflex mechanisms and sympathetic tone could be involved in the arterial hypertension by coarctation of abdominal aorta artery (CoA). The present work analyzes the effect on the arterial pressure and heart rate (HR) of the clonidine, an alpha(2)-adrenergic central acting antihypertensive agent, after intravenous (i.v.), intracerebroventricular (i.c.v.) and intrathecal (i.t.) administration in rats anesthetized with pentobarbital (40 mg/kg i.p.).Wistar rats of both sexes (240-270 g) were used to the 7 days of the CoA or a sham operation (SO). Values of mean arterial pressure (MAP) and of HR were calculated from intraarterial recordings of blood pressure. The MAP of the CoA rats (161.5+/-5.3 mmHg, n=20) was significantly higher (P<0.01) than that of the SO rats (101.6+/-3.3 mmHg, n=20). The i.v. injection of clonidine (3-30 microg/kg) produced an increase of blood pressure in the rats SO and in the CoA animals, followed by a fall of arterial pressure in both groups of rats. Clonidine showed a small pressor effect but also a great depressor action in the hypertensive rats. Except for with the dose of 10 microg/kg, differences in cardiac response to clonidine were not seen in both groups of rats. Injection of clonidine by the i.c.v. via (10 microg) like by the i.t. (3 microg) also produced a greater fallen of the MAP in the hypertensive rats than in the controls SO animals. In conclusion, these hypertensive animals would be sensitive to the antihypertensive action of central acting alpha(2)-adrenoceptor agonist clonidine administered by different ways, suggesting a great sensitivity of the post-synaptic alpha(2)-adrenoceptor of central nervous system.

journal_name

Pharmacol Res

journal_title

Pharmacological research

authors

Gorzalczany SB,Opezzo JA,del Carmen Garcia M,Taira CA

keywords:

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

17-24

issue

1

eissn

1043-6618

issn

1096-1186

pii

S1043661803000586

journal_volume

48

pub_type

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