Document Detail


Effect of ventilation frequency and tidal volume on pleural space thickness in rabbits.
MedLine Citation:
PMID:  8282639     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The thickness of the pleural space was measured by fluorescence video-microscopy during mechanical ventilation in anesthetized paralyzed rabbits. A transparent parietal pleural window was made in the fourth or sixth intercostal space near midchest by dissection of intercostal muscle and endothoracic fascia. Fluorescence-labeled (fluorescein isothiocyanate) dextran solution (1 ml) was injected into the pleural space via a rib capsule and allowed to mix with the pleural liquid. With the rabbit in the left lateral decubitus position and the pleural window superior, the light emitted from the pleural liquid through the pleural window was measured through the videomicroscope. Both ventilation frequency and tidal volume were varied. Pleural space thickness was determined by in vitro calibration of the pleural liquid at the end of the experiment. At a frequency of 40 breaths/min and a tidal volume of 20 ml, pleural space thickness averaged 35 +/- 15 (SD) microns (n = 7). When frequency was reduced to 8 breaths/min, this value was reduced by 40% to 22 +/- 11 microns. A reduction in tidal volume from 20 to 6 ml at a frequency of 40 breaths/min produced a similar reduction in pleural space thickness. During apnea, pleural space thickness averaged 11 +/- 3 microns. Cardiogenic motion had no measurable effect on pleural space thickness. The increased pleural space thickness with ventilation might serve to reduce the power dissipated due to sliding of the lung relative to the chest wall. Results support the concept of lubrication as the primary function of the pleural space.
Authors:
P M Wang; S J Lai-Fook
Related Documents :
22930219 - Effects of exercise on s-iga and urs in postmenopausal women.
1601769 - Va/q distribution during heavy exercise and recovery in humans: implications for pulmon...
22978369 - Ige detection to α/β/γ-gliadin and its clinical relevance in wheat-dependent exercis...
7784719 - Comparison of exertion required to perform standard and active compression-decompressio...
10972309 - Changes in work practice after a respiratory health survey among welders in new zealand.
12083289 - Effect of exercise testing protocol on the relationship between minute ventilation and ...
17387509 - Endogenous hydrogen peroxide in paraventricular nucleus mediating cardiac sympathetic a...
1597229 - Gallopamil and diltiazem: a double-blind, randomized, cross-over trial in effort ischae...
16612739 - Pulmonary o2 uptake on-kinetics in endurance- and sprint-trained master athletes.
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  75     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1993 Oct 
Date Detail:
Created Date:  1994-02-14     Completed Date:  1994-02-14     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:  1836-41     Citation Subset:  IM    
Affiliation:
Center for Biomedical Engineering, University of Kentucky, Lexington 40506.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Animals
Apnea / physiopathology
Blood Gas Analysis
Blood Pressure / physiology
Heart / physiology
Heart Rate / physiology
Lung / anatomy & histology
Microscopy, Fluorescence
Pleura / anatomy & histology*,  physiology
Rabbits
Respiration, Artificial
Respiratory Mechanics / physiology*
Tidal Volume / physiology*
Grant Support
ID/Acronym/Agency:
HL-36597/HL/NHLBI NIH HHS

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


Previous Document:  Effects of age, adiposity, and fitness level on plasma catecholamine responses to standing and exerc...
Next Document:  Dynamic multichannel near-infrared optical imaging of human brain activity.