Document Detail

Comparison of mouth and oesophageal pressure fluctuations during panting against an occlusion.
MedLine Citation:
PMID:  3607329     Owner:  NLM     Status:  MEDLINE    
In four normal volunteers, differences between oesophageal pressure fluctuations (delta Pes) in the upper and lower parts of the oesophagus and mouth pressure fluctuations (delta Pm), simultaneously measured during panting against an occlusion, were evaluated. Averaged quasi static pressure-volume curves were obtained by measuring pressure in the upper and lower thirds of the oesophagus. The differences between delta Pes and delta Pm during panting, due to elastic recoil changes, were predicted from an exponential relationship fitted to the pressure-volume curves. The calculated errors were compared with those observed experimentally. In the lower part of the oesophagus, delta Pes was similar to delta Pm at lung volumes in the range of 50 to 70% of Vmax. Vmax was deduced from the asymptote of the exponential curve. Mean delta Pes/delta Pm was 0.98 +/- 0.08 (SD). In the upper oesophagus, delta Pes was lower than delta Pm. Mean delta Pes/delta Pm was 0.87 in the range of 50 up to 90% of Vmax with an SD +/- 0.15. At lung volumes above 90% of Vmax for the upper oesophagus and above 70% of Vmax for the lower oesophagus, the ratio of delta Pes to delta Pm exceeded 1 and progressively increased. The measured values were often higher than those predicted from the fitted curves, presumably due to a narrowed glottic aperture. We concluded that in normals both the positioning of the oesophageal balloon in the lower oesophagus and a lung volume near functional residual capacity (FRC) are prerequisites for the use of delta Pm as a control for delta Pes, or vice versa, during panting against an occlusion.
J M Bogaard; A Versprille
Related Documents :
8439019 - Effect of posture on lung and regional chest wall mechanics.
15465889 - Mechanics, nonlinearity, and failure strength of lung tissue in a mouse model of emphys...
1201639 - Variations in bronchial movement.
15253119 - Validation of airflow perturbation device resistance measurements in excised sheep lungs.
24841239 - Open circuit mouthpiece ventilation: concise clinical review.
670009 - Effect of parenchymal shear modulus and lung volume on bronchial pressure-diameter beha...
1494509 - The effect of hemiplegia on blood pressure measurement in the elderly.
14757449 - Collagen fibers reduce stresses and stabilize motion of aortic valve leaflets during sy...
22613739 - Comparison of blood pressure and sympathetic activity of rabbits in their home cage and...
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Bulletin européen de physiopathologie respiratoire     Volume:  23     ISSN:  0395-3890     ISO Abbreviation:  Bull Eur Physiopathol Respir     Publication Date:    1987 Mar-Apr
Date Detail:
Created Date:  1987-09-17     Completed Date:  1987-09-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7605263     Medline TA:  Bull Eur Physiopathol Respir     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  149-53     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Airway Resistance*
Lung Volume Measurements

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

Previous Document:  Reference values and modelling of lung function development as a transcendent function of age, body ...
Next Document:  Non-uniform lung elastic properties and the slope of the alveolar plateau.