Correcting for the Bernoulli effect in lateral pressure measurements

Bates, J.H.T., Sly, P.D., Sato, J., Davey, B.L.K. and Suki, B. (1992) Correcting for the Bernoulli effect in lateral pressure measurements. Pediatric Pulmonology, 12 4: 251-256. doi:10.1002/ppul.1950120410


Author Bates, J.H.T.
Sly, P.D.
Sato, J.
Davey, B.L.K.
Suki, B.
Title Correcting for the Bernoulli effect in lateral pressure measurements
Journal name Pediatric Pulmonology   Check publisher's open access policy
ISSN 8755-6863
1099-0496
Publication date 1992-04
Sub-type Article (original research)
DOI 10.1002/ppul.1950120410
Volume 12
Issue 4
Start page 251
End page 256
Total pages 6
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Abstract Measurement of airway pressure is essential in the study of respiratory mechanics, and is usually done via a lateral tap in the conduit (e.g., endotracheal tube, cannula, or mouthpiece) leading into the subject's airway. Such pressure measurements, however, may be severely affected by the Bernoulli effect if the diameter of the conduit is small and the gas flow through it sufficiently high. We present in this note a simple method of assessing whether or not the Bernoulli effect is important in any particular situation. The technique involves comparing the pressure-flow relationships of the conduit obtained both by blowing air through it from one end and sucking air in the reverse direction by applying negative pressure at the same end. If the resistance of the conduit is the same for gas flow in both directions, then half the magnitude of the difference between the two pressure-flow relationships gives the magnitude of the Bernoulli effect pressure. We give results of an experimental situation in which this was the case. We also show that those conditions under which the Bernoulli effect is likely to be a problem are also those under which the velocity profile is likely to be approximately flat, thereby permitting the magnitude of the Bernoulli effect to be easily calculated.
Keyword Respiratory mechanics
Resistance
Velocity profile
Expiratory flow interruption
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Medicine Publications
 
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Created: Wed, 17 Nov 2010, 11:17:21 EST