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Accuracy of oxygen delivery by liquid oxygen canisters

MJ Kampelmacher, PB Cornelisse, GP Alsbach, RG van Kesteren, CF Melissant, JM Douze, JW Lammers
European Respiratory Journal 1998 12: 204-207; DOI:
MJ Kampelmacher
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PB Cornelisse
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GP Alsbach
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RG van Kesteren
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CF Melissant
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JM Douze
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JW Lammers
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Abstract

The oxygen flow rate delivered by liquid oxygen canisters may be less than intended, owing to inaccuracies of the set flow rates and/or as a result of the outflow resistance caused by the humidifier, oxygen tubing, delivery or conserving device. The aim of this study was to investigate the accuracy of oxygen delivery by liquid oxygen canisters at different flow rates and levels of outflow resistance. Four stationary and 18 portable liquid oxygen canisters from three manufacturers were tested. All flows were measured using a Timemeter RT 200 Calibration Analyser. An adjustable obstruction was used to calculate the effect of the outflow resistance on the delivered flow rate. The measured and set flow rates of both stationary and portable canisters were strongly correlated. Expressed as a percentage of the set flow rate, the measured flow rate of the canisters varied from 36-128%, with the lowest values at flow rates <1 L x min(-1). Sixty-two (26%) of the measured flow rates differed > or =10% from the set flow rate. A difference of 0.5-1.0 L x min(-1) occurred in 16 (7%) of the measurements, but only at set flow rates >2 L x min(-1). Irrespective of the set flow rate, the measured flow rate was hardly affected by the outflow resistance. We conclude that the accuracy of oxygen delivery by liquid oxygen canisters depends on the inaccuracy of the set flow rates rather than on the outflow resistance, even at high flow rates. Although the differences between the measured and set flow rates were mostly small, they may have clinical significance, particularly in patients with chronic obstructive pulmonary disease. To prevent inaccuracy, monthly checks of the canisters by the oxygen provider at the patient's home are more important than yearly maintenance.

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Accuracy of oxygen delivery by liquid oxygen canisters
MJ Kampelmacher, PB Cornelisse, GP Alsbach, RG van Kesteren, CF Melissant, JM Douze, JW Lammers
European Respiratory Journal Jul 1998, 12 (1) 204-207;

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Accuracy of oxygen delivery by liquid oxygen canisters
MJ Kampelmacher, PB Cornelisse, GP Alsbach, RG van Kesteren, CF Melissant, JM Douze, JW Lammers
European Respiratory Journal Jul 1998, 12 (1) 204-207;
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