Linked Life Data

3164470

Source:http://linkedlifedata.com/resource/pubmed/id/3164470

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1988-7-29
pubmed:abstractText
Ventilation of immature airways has been shown to result in pressure-induced deformation and alteration of mechanical properties. These changes in mechanical properties may alter the effect of compressive pressures on pressure-flow relationships. To test this hypothesis, unventilated (Group I, n = 8) and ventilated (group II, n = 8; mean pressures of 8-12 cm H2O for 2 h duration) tracheal segments were excised from preterm lambs approximately 118 days gestation and mounted in a Krebs-filled chamber for determination of compliances and pressure-flow relationships. Compliance data were obtained for both the inflation loop (inflation compliance) and the collapsing loop (collapsing compliance) of the pressure-volume curve for each segment. Flow (V = 2-10 liter/min.) was introduced through the lumen of each segment at different chamber pressures (Pc = 5-30 mm Hg). Driving pressure (Pd) was recorded for each V and Pc. Airway resistance (R) was calculated as Pd/V. Group II had significantly greater (p less than 0.005) radii than Group I, suggesting ventilation-induced deformation. Group II had significantly lower (p less than 0.05) inflation compliance but significantly greater (p less than 0.05) collapsing compliance than group I. Two-factor analysis of variance demonstrated significantly greater (p less than 0.05) R in group II at each value of V and each Pc. These data may help to explain the flow limitation and gas-trapping observed in preterm infants who have been mechanically ventilated.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0031-3998
pubmed:author
pubmed:issnType
Print
pubmed:volume
23
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
519-24
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Effect of ventilation on mechanical properties and pressure-flow relationships of immature airways.
pubmed:affiliation
Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania 19140.
pubmed:publicationType
Journal Article, In Vitro, Research Support, U.S. Gov't, P.H.S.