Linked Life Data

6104717

Source:http://linkedlifedata.com/resource/pubmed/id/6104717

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1980-9-26
pubmed:abstractText
The direct and indirect chronotropic effects of clonidine (0.001--10 micrograms/ml) were studied by selective perfusion of the sinus node artery of 20 pentobarbital anesthetized dogs. Concentrations of 0.1, 1.0 and 10 migrograms/ml produced dose-related reductions in sinus rate of 3.7 +/- 0.9 (P less than .005), 6.9 +/- 1.8 (P less than .005) and 15.8 +/- 2.3 (P less than .0001) beats/min, respectivel. Sinus acceleration after right stellate ganglion stimulation at 16 and 32 Hz was significantly (P less than .05) inhibited by intranodal clonidine (0.1 microgram/ml). The positive chronotropic effect of norepinephrine (0.1 microgram/ml, sinus node artery) was not significantly affected by prior administration of clonidine. Atropine (1 mg/kg i.v. or 10 micrograms/ml, selectively perfused into the sinus node artery) had no effect on the sinus slowing produced by clonidine. Clonidine had an inconsistent effect on the response to vagal stimulation. Clonidine had an inconsistent effect on the response to vagal stimulation. Clonidine inhibits the heart rate increase after sympathetic nerve stimulation without affecting the heart rate response to norepinephrine infusion. The findings are consistent with previous observations that clonidine can inhibit norephinephrine release and demonstrate that this mechanism of action may occur within the sinus node.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0022-3565
pubmed:author
pubmed:issnType
Print
pubmed:volume
214
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
223-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1980
pubmed:articleTitle
Selective effects of clonidine on the canine sinus node.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.