Linked Life Data

12883320

Source:http://linkedlifedata.com/resource/pubmed/id/12883320

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2003-7-28
pubmed:abstractText
In this study, the authors sought to evaluate the mechanisms responsible for echocardiographically determined differences in cardiac structure and function between conscious and anesthetized mice to determine whether such differences were more or less evident in diseased states. Cardiac parameters were determined by transthoracic echocardiography. Mice anesthetized with a mixture of ketamine and xylazine showed reductions in heart rate (HR, 252 +/- 16 beats/min versus 734 +/- 9 beats/min) and fractional shortening (FS, 35% +/- 2% versus 59% +/- 2%) compared with conscious mice. Conscious mice responded little to the beta-agonist isoproterenol or atropine, but showed profound reductions in HR and FS in response to the beta(1)-antagonist atenolol. In contrast, both isoproterenol and atropine led to increases in HR and FS in anesthetized mice. The stress in conscious animals was reduced by the sedative midazolam, leading to partial restoration of responses to isoproterenol. Mice with constitutive activation of the beta-adrenergic system, due to cardiac overexpression of beta(2)-adrenergic receptors or with heart disease (myocardial infarct and pressure-overload hypertrophy) showed few differences in functional parameters between conscious and anesthetized states, attributable to pre-existing activation of the sympathetic and beta-adrenergic systems, even during anesthesia. The results indicate that the autonomic nervous system plays a critical role in the observed differences in cardiac structure and function between anesthetized and conscious mice.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0160-2446
pubmed:author
pubmed:issnType
Print
pubmed:volume
42
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
182-90
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Assessment of cardiac function by echocardiography in conscious and anesthetized mice: importance of the autonomic nervous system and disease state.
pubmed:affiliation
Experimental Cardiology Laboratory, Baker Heart Research Institute, St. Kilda Road Centrral, Melbourne, Victoria 8008, Australia.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't