Source: Annual Congress 2002 - Assessment of lung function, telemonitoring and quality of life

Abstract

Background When O₂ is supplied using fixed performance Venturi masks, the manufacturers recommend a specific O₂ flow rate. As O₂ flow rates are often inaccurately set (Jeffery AA, Douglas NJ. Thorax 1989;44:1036-7) and because the provision of high flow rates during ambulatory O₂ therapy quickly exhausts the cylinders, we investigated the effect of varying the O₂ flow rate with different Venturi valves upon the resulting oxygen concentration (FiO₂). Methods A custom-made lung model, connected to a resus dummy head, was used to simulate spontaneous breathing (minute ventilation 8.8Lpm). 24, 28 and 35% venturi valves, attached to a face mask (Medic-Aid), were evaluated at flow rates of 1-15Lpm. The recommended flow rates were 3, 6 and 10 respectively. O₂ was supplied from a size 'G' cylinder and flow rate accurately measured with a pneumotachometer (Hans-Rudolf, Inc). The FiO₂ was determined using an oxygen analyser (TED 60T, Teledyne Analytical Instruments). Results

The 24 and 28% valves performed well over the entire range of flow rates and the 35% valve at all flow rates in excess of 1Lpm. Conclusion When Venturi masks are used, incorrect setting of the O₂ flow rate does not affect the FiO₂. Using a 35% valve it was possible to deliver the desired FiO₂ with a flow rate of just 2Lpm. Use of lower flow rates prolongs the time that oxygen can be delivered from a cylinder. JVJ Lightowler is funded by a British Lung Foundation Project Grant.

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Citations should be made in the following way:
J. V. J. Lightowler, W. Gardner, M. W. Elliott (Leeds, United Kingdom). Performance of venturi valves with different oxygen flow rates. Eur Respir J 2002; 20: Suppl. 38, 1000

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