Measurement of tidal flow using a transit-time ultrasonic breath analyser.

Abstract:

:The ability of the Transit-time Ultrasonic Breath Analyser (TUBA, GHG Medical Electronics GMBH, Zürich, Switzerland) to measure peak flow and tidal volume in the laboratory was tested using a variety of flow and pressure conditions, chosen to simulate the respiratory patterns of patients receiving mechanical ventilatory support. A stable zero baseline was achieved by acoustic damping of the TUBA flow sensor head. A piston pump was used to generate sinusoidal flow pattern, with a peak flow range from 0.1 to 1.51.s-1. The calculated peak flow matched the peak flow measured by the TUBA. The TUBA accurately measured tidal volumes (+/- 10%) delivered using three different flow patterns over a range of volumes from 0.25 to 11. We conclude, that once modified, the TUBA can provide an accurate measurement of peak flow and tidal volume over a range of values likely to be encountered during mechanical ventilation of the lungs.

journal_name

Anaesthesia

journal_title

Anaesthesia

authors

Williams EM,Burrough SL,McPeak H

doi

10.1111/j.1365-2044.1995.tb05999.x

subject

Has Abstract

pub_date

1995-05-01 00:00:00

pages

427-32

issue

5

eissn

0003-2409

issn

1365-2044

journal_volume

50

pub_type

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