Document Detail

Auscultation using ultrasound-Doppler techniques.
MedLine Citation:
PMID:  18189660     Owner:  NLM     Status:  In-Data-Review    
An earlier presentation described a hybrid instrument using electromechanical and ultrasound-Doppler techniques to permit auscultation in extremely noisy environments, such as Army medical evacuation vehicles [Houtsma et al., J. Acoust. Soc. Am. 120, 3361 (2006)]. That paper presented the theories behind the hybrid instrument and provided simulations of auscultation in noisy environments. An update on the progress since the first report is presented. In one study, recordings of cardiac and pulmonary sounds from healthy volunteers aboard an in-flight Black Hawk helicopter are presented. As anticipated, auscultation with the electro-mechanical (acoustic) mode was impossible inside the aircraft. Using the ultrasound-Doppler mode, all heart sounds and most lung sounds were clearly audible. The best-audible lung sounds came from the mid-axillary left and right locations. A second study was performed to determine if the hybrid instrument could be used to detect the difference in sound in a correctly versus incorrectly ventilated swine. After some experimentation with precise auscultation sites, the listener was able to detect both heart and lung sounds reliably in both electromechanical and ultrasound-Doppler modes. Recommendations to improve the performance of the instrument in the next iteration of the device are presented.
William A Ahroon; Adrianus J M Houtsma; Ian P Curry
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  122     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2008-01-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2957     Citation Subset:  IM    
US Army Aeromedical Res. Lab., Fort Rucker, AL 36362-0577.
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