NDLI: Effects of diameter, length, and circuit pressure on sound conductance through endotracheal tubes

Content Provider	IEEE Xplore Digital Library
Author	Rasanen, J.O. Rosenhouse, G. Gavriely, N.
Copyright Year	1964
Abstract	We evaluated the acoustic frequency response of endotracheal tubes (ETs) to assess their effect on respiratory system sound transmission studies. White noise 150-3300 Hz was introduced into 4.0-, 6.0-, and 8.0-mm ETs and recorded at their proximal and distal ends. Four tubes of each size were studied at their original and normalized lengths, in straight and bent configurations, and at circuit pressures from 0 to 20 cmH/sub 2/O. The characteristics of the sound transmission were compared using an analysis of variance for repeated measures. The average transmission amplitude varied directly with tube diameter. The position of peaks and troughs on the amplitude frequency distribution depended on tube length but not on tube diameter. The angle of the phase-frequency plot correlated well with the length of the tube and was independent of its diameter. A 90/spl deg/ bend in the tube had no effect on its sound transmission. Increasing the circuit pressure above ambient modified the frequency response only if volume changes occurred in the test lung. When used to conduct sound into the respiratory system an ET affects the incident signal predictably depending on its length and diameter but not on its curvature or circuit pressure.
Sponsorship	IEEE Engineering in Medicine and Biology Society
Page Count	10
File Size	482861
Starting Page	1255
Ending Page	1264
File Format	PDF
ISSN	00189294
Volume Number	53
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lungs Frequency response Respiratory system Circuit testing Injuries Animals White noise Analysis of variance Acoustic testing Acoustic signal detection sound transmission Pulmonary acoustics respiratory sounds
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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