| Effects of high-frequency chest wall oscillation on pleural pressure and oscillated flow. | |
| | |
MedLine Citation:
|
PMID: 19012467 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The effectiveness of high-frequency chest wall oscillation (HF-CWO) is directly related to the level of oscillated flow (osc) in the airways. We used the Vest system to investigate the effects of HFCWO on chest wall and pleural pressures and we correlated these pressures to the resultant osc. We also compared the latest HFCWO device with it predecessor. Different combinations of vest inflation pressure (background pressure) and oscillation frequency were randomly applied to 10 healthy volunteers. Chest wall pressure was determined using an air-filled bag under the vest and pleural pressure was estimated using an esophageal balloon. Reverse plethysmography was used to measure osc at the mouth and a spirometer was used to measure changes in end-expired lung volume. We found a significant correlation between chest wall and pleural pressure with approximately one-third of the chest wall pressure transmitted into the pleural space. Mean esophageal pressure remained negative at all background pressure/frequency combinations. There was a significant correlation (p<0.0001) between the esophageal pulse pressure and osc, which was highest at 15Hz regardless of the background pressure. The end-expired lung volume correlated with mean chest wall pressure. There was no significant difference between the two Vest systems. Since osc dictates the effectiveness of HFCWO and since osc is dependent on esophageal pulse pressure, which in turn is dependent on chest wall pulse pressure, it follows that the effectiveness of HFCWO is influenced by the ability to generate an effective chest wall pulse pressure. |
| | |
Authors:
|
Tal Zucker; Neil M Skjodt; Richard L Jones |
Related Documents
:
|
15507167 - Determinants of dynamic hyperinflation in a bench model. 6331777 - Effect of posture on upper and lower rib cage motion and tidal volume during diaphragm ... 8063667 - Frequency dependence of pulmonary and chest wall mechanics in young and adult cats. 22414527 - Impact of anesthesia on pathophysiology and mortality following subarachnoid hemorrhage... 2031417 - Reliability of standard apexcardiography for the measurement of sudden variations in me... 6639897 - Pregnancy-associated hypertension, a comparison of its prediction by 'roll-over test' a... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Biomedical instrumentation & technology / Association for the Advancement of Medical Instrumentation Volume: 42 ISSN: 0899-8205 ISO Abbreviation: Biomed Instrum Technol Publication Date: 2008 Nov-Dec |
Date Detail:
|
Created Date: 2008-11-17 Completed Date: 2009-02-05 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8905560 Medline TA: Biomed Instrum Technol Country: United States |
Other Details:
|
Languages: eng Pagination: 485-91 Citation Subset: IM |
Affiliation:
|
Department of Medicine, Pulmonary Division, University of Alberta, Edmonton, Alberta, Canada. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adult Aged Blood Pressure / physiology* Chest Wall Oscillation / instrumentation*, methods* Esophagus / physiology* Female Humans Male Middle Aged Respiratory Mechanics / physiology* Thorax / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Testing potential interference with RFID usage in the patient care environment.
Next Document: Characterization of Ontogenetic Changes in Gene Expression in the Fathead Minnow (Pimephales promela...