Document Detail


Breath sound changes associated with malpositioned endotracheal tubes.
MedLine Citation:
PMID:  15865129     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Endotracheal tubes (ETTs) are used to establish airway access in patients with ventilatory failure and during general anaesthesia. Tube malpositioning can compromise respiratory function and can be associated with increased morbidity and mortality. Clinical assessment of ETT position normally involves chest auscultation, which is highly skill-dependent and can be misleading. The objective of this pilot study was to investigate breath sound changes associated with ETT malpositioning. Breath sounds were acquired in six human subjects over each hemithorax and over the epigastrium for tracheal, bronchial and oesophageal intubations. When the ETT was in the oesophagus, the acoustic energy ratio between epigastrium and chest surface increased in all subjects (p < 0.04). In addition, ETT placement in the right mainstem bronchus decreased the acoustic energy ratio between the left and right hemithoraxes in all subjects (p < 0.04). A baseline measurement of this energy ratio was needed for bronchial intubation identification. However, using this ratio after bandpass filtering (200-500 Hz) did not require a baseline value, which would increase the utility of this method for initial ETT placement. These results suggest that computerised analysis of breath sounds may be useful for assessment of ETT positioning. More studies are needed to test the feasibility of this approach further.
Authors:
H A Mansy; C J O'Connor; R A Balk; R H Sandler
Related Documents :
21957569 - Guidelines for youth sports safety.
3702649 - Influence of supplemental oxygen on the physiological response to the po2 aerobic exerc...
22437659 - Is arthroscopic surgery beneficial in treating non-traumatic, degenerative medial menis...
10232789 - Cardiorespiratory variables and sensation during stimulation of the left vagus in patie...
6510389 - Aggravation of exercise performance in patients with anemia by 3% carboxyhemoglobin.
10707319 - Gas exchange and heart rate in the harbour porpoise, phocoena phocoena.
20004089 - Plasma ammonia response to incremental cycling and walking tests in copd.
11772159 - Endogenous anabolic hormone responses to endurance versus resistance exercise and train...
22744599 - Comparison of influence of three physiotherapeutic techniques: postisometric relaxation...
Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Medical & biological engineering & computing     Volume:  43     ISSN:  0140-0118     ISO Abbreviation:  Med Biol Eng Comput     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-05-03     Completed Date:  2005-08-01     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7704869     Medline TA:  Med Biol Eng Comput     Country:  England    
Other Details:
Languages:  eng     Pagination:  206-11     Citation Subset:  IM    
Affiliation:
Biomedical Acoustics Research Group, Department of Pediatrics, Rush Medical College, Chicago, IL, USA. hansen_mansy@rush.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Acoustics
Bronchi
Esophagus
Foreign Bodies / diagnosis*,  etiology
Humans
Intubation, Intratracheal / adverse effects*
Pilot Projects
Respiratory Sounds / etiology*
Signal Processing, Computer-Assisted
Grant Support
ID/Acronym/Agency:
61108//PHS HHS

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


Previous Document:  Cell calcium oscillations: the origin of their variability.
Next Document:  Detection of the third heart sound using a tailored wavelet approach: method verification.