Linked Life Data

6209492

Source:http://linkedlifedata.com/resource/pubmed/id/6209492

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1984-12-28
pubmed:abstractText
We studied the comparative effects of beta-adrenergic blockade with propranolol (PROP) and bucindolol (BUC), a beta-adrenergic agonist having both alpha-adrenergic blocking properties and intrinsic sympathomimetic activity (ISA) on airway and cardiovascular responses, in 38 mongrel dogs in situ. Intravenous infusion of 0.6 mg/kg + 6 micrograms/kg/min BUC and 2.0 mg/kg + 20 micrograms/kg/min PROP caused identical shifts in the isoproterenol (ISO) EC50 for chronotropic and hypotensive arterial blood pressure responses. After PROP administration, resting heart rate (HR) decreased from 188 +/- 15 to 142 +/- 12 beats/min (p less than 0.02); BUC caused no decrease in HR. In contrast, the effects of BUC and PROP on mean arterial blood pressure response to ISO were similar. No change in bronchomotor tone was observed after bolus injection of either BUC or PROP. Beta-Adrenergic relaxation to ISO and alpha-adrenergic contraction to norepinephrine (NE) were studied simultaneously in tracheal and bronchial airways using chronotropically equivalent beta-adrenoceptor blocking doses of PROP and BUC. Comparable inhibition of ISO-induced airway relaxation after contraction with 120 micrograms/kg/min i.v. serotonin was demonstrated in both PROP (n = 5) and BUC (n = 5) groups (p less than 0.01 for doses greater than 5 X 10(-11) mol/kg). Similarly, both BUC (n = 5) and PROP (n = 5) blocked beta-adrenergic relaxation and caused identical alpha-adrenergic airway contraction to intravenous NE. We conclude that the ISA of the beta-adrenergic blocking drug BUC can be demonstrated on the spontaneous rate of the heart but not on the activity of bronchial smooth muscle. BUC neither augments ISO-induced relaxation nor inhibits NE-induced contraction of airways after effective chronotropic blockade.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0160-2446
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
859-66
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:articleTitle
Selectivity of the intrinsic sympathomimetic activity of the beta-adrenergic blocking drug bucindolol.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't