Linked Life Data

8466119

Source:http://linkedlifedata.com/resource/pubmed/id/8466119

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1993-4-30
pubmed:abstractText
The relative invasiveness of the balloon catheter technique in measuring twitch transdiaphragmatic pressure (Pdit) limits its clinical use. By phrenic stimulation we obtained swings in mouth pressure (Pmt) in six COPD patients (age 50 to 72, FEV1 18 to 48% of predicted) at relaxed FRC (rFRC) and during graded inspiratory efforts (IE; twitch occlusion, TO). At rFRC, Pmt was damped and time lagged relative to the esophageal pressure twitch (Pes(t)), as if pressure had equilibrated through an RC system. Pmt was not correlated with Pdit. Conversely, Pmt and Pes(t) were always well matched during IE [Pmt = 0.971 (SEM +/- 0.028) Pes(t), r > 0.89], possibly in relation to a decrease in upper airway compliance or more uniform pleural pressure swings. Pmt decreased with the level of voluntary diaphragmatic contraction (Pdivol) in proportion to Pdit, reflecting a progressive increase in the level of diaphragm activation. During IE, Pmt was closely related to the voluntary mouth pressure in five subjects but not in the remaining subject, indicating intersubject variability in the level of diaphragmatic recruitment relative to other inspiratory muscles. We submit that measuring Pm during inspiratory efforts upon which bilateral phrenic stimulation is superimposed offers a relatively simple method for the assessment of diaphragm activation, potentially applicable in the clinical field.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0003-0805
pubmed:author
pubmed:issnType
Print
pubmed:volume
147
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
850-6
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Assessment of diaphragm function using mouth pressure twitches in chronic obstructive pulmonary disease patients.
pubmed:affiliation
Meakins-Christie Laboratories, Royal Victoria Hospital, McGill University Clinic, Montreal, Quebec, Canada.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't