In vitro assessment of an ultrasonic flowmeter for use in ventilated infants

Scalfaro, P., Cotting, J. and Sly, P. D. (2000) In vitro assessment of an ultrasonic flowmeter for use in ventilated infants. European Respiratory Journal, 15 3: 566-569. doi:10.1034/j.1399-3003.2000.15.23.x

Author Scalfaro, P.
Cotting, J.
Sly, P. D.
Title In vitro assessment of an ultrasonic flowmeter for use in ventilated infants
Journal name European Respiratory Journal   Check publisher's open access policy
ISSN 0903-1936
Publication date 2000-03
Sub-type Article (original research)
DOI 10.1034/j.1399-3003.2000.15.23.x
Volume 15
Issue 3
Start page 566
End page 569
Total pages 4
Place of publication Lausanne, Switzerland
Publisher European Respiratory Society
Language eng
Formatted abstract
An ultrasonic flowmeter could be advantageous over a differential pressure pneumotachograph having a constant error in varying conditions. The in vitro accuracy of ultrasonic tidal volume (VT) estimates for ventilated infants were evaluated. Flow linearity and frequency response were tested, as was the influence of humidity and oxygen content on the accuracy of VT estimates. The linearity was within the 5% limits between -350 and 350 mL·sec-1 and was not affected by the presence of an endotracheal tube (ET). The frequency response was flat and unaffected by an ET up to 4.5 Hz. The VT in the range 7-100 mL, in air showed a mean error of 0.1% (95% confidence interval (CI) -0.2-0.4%) with a maximum and minimum of 6.5 and - 3.5% respectively. Humidity did not affect accuracy. After calibration in air, the maximal mean error for measurements in pure oxygen was 3.0% (95% CI 1.9-4.1%). Repeated measurements over 5.5 h had a mean error of 0.4% (95% CI -0.7-0.1%). The in vitro evaluation of an ultrasonic flowmeter showed stable accuracy in mechanical ventilation conditions. Changing connection geometry and oxygen content did not increase the error to a clinically relevant degree. The flowmeter could therefore be a better alternative than the pneumotachograph for ventilated infants.
Keyword In vitro assessment
Mechanical ventilation
Tidal volume measurement
Ultrasonic flowmeter
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Health and Behavioural Sciences -- Publications
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 17 Nov 2010, 11:45:48 EST