Document Detail

Ventilatory and diaphragmatic EMG changes during negative-pressure ventilation in healthy subjects.
MedLine Citation:
PMID:  3403414     Owner:  NLM     Status:  MEDLINE    
To evaluate the response of normal subjects to assisted ventilation, we studied 6 naive healthy subjects before and during negative-pressure ventilation (NPV) with "low" (-10 cmH2O) and "high" (-30 cmH2O) pressures in an Emerson tank respirator. Ventilation was measured with an inductive plethysmograph (Respitrace), and diaphragmatic electromyogram (DEMG) was studied with a bipolar esophageal electrode. During NPV a 1:1 phase lock was observed between subjects and iron lung frequency in all subjects. Tidal volume increased in most subjects, more with high than with low pressures (P less than 0.05), whereas DEMG increased, decreased, or showed no change. Postinspiratory inspiratory diaphragmatic activity (PIIA) significantly increased during high-pressure NPV and was accompanied by an increase in tonic DEMG in one-half of the subjects. Voluntary relaxation resulted in a decrease in DEMG and PIIA. We suggest that cortical activity can explain persistency of active breathing during negative-pressure ventilation.
D O Rodenstein; G Cuttitta; D C Stănescu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  64     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1988 Jun 
Date Detail:
Created Date:  1988-09-21     Completed Date:  1988-09-21     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2272-8     Citation Subset:  IM    
Cardiopulmonary Laboratory, Cliniques Universitaires St. Luc, Brussels, Belgium.
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MeSH Terms
Diaphragm / physiology*
Reference Values
Respiration, Artificial*
Respiratory Muscles / physiology*
Tidal Volume

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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