Linked Life Data

3706801

Source:http://linkedlifedata.com/resource/pubmed/id/3706801

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1986-6-16
pubmed:abstractText
To better understand the mechanism of hypotension and bradycardia that may occur in newborn infants during isoflurane anesthesia, we studied the hemodynamic changes in the major determinants of cardiac output in 15 newborn piglets given 0.5, 1.0, and 1.3 minimal alveolar concentrations (MAC) of isoflurane and in nine sham-instrumented, age-matched control animals. Cardiac output did not differ from the baseline reading or the control group at any isoflurane dose. Mean aortic pressure (MAP) decreased 23-45% in a dose-related manner. Total peripheral resistance index (TPRI) decreased 29% at 0.5 MAC, but did not decline further at higher concentrations. Because the decrease in MAP was offset by a similar reduction in TPRI, cardiac output did not change. Heart rate decreased significantly at 1.3 MAC (-19%). Contractility was depressed at all concentrations: left ventricular dP/dT decreased progressively at 0.5 and 1.0 MAC, and echocardiographic shortening fraction decreased significantly at 1.0 MAC. Left ventricular end-diastolic pressure was not affected. Eight of twelve animals who had bradycardia while breathing isoflurane were atrially paced at their baseline heart rate. Because pacing did not restore MAP, TPRI, and LV dP/dT/DP40 (a contractile index independent of preload and afterload) to control values, bradycardia was not primarily responsible for depression of these variables. At equipotent concentrations, isoflurane reduced MAP and TPRI more than, and cardiac output less than, halothane did in previous studies in this laboratory. Heart rate and dP/dT were decreased to a similar extent by both agents. Blood, heart, and brainstem isoflurane LD:MAC ratios were 2.04, 2.00, and 2.84, respectively, indicating a relatively low margin of safety for isoflurane in young piglets.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0003-2999
pubmed:author
pubmed:issnType
Print
pubmed:volume
65
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
633-8
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
Hemodynamic effects of isoflurane in the newborn piglet: comparison with halothane.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't