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Chest, Vol 86, 667-670, Copyright © 1984 by American College of Chest Physicians

ARTICLES

A demand valve conserves oxygen in subjects with chronic obstructive pulmonary disease

M Mecikalski and JW Shigeoka

Demand valves conserve oxygen by limiting delivery to the inspiratory phase of respiration and reducing the waste which occurs during expiration with conventional, constant flow therapy. However, arterial oxygen tensions (PaO2) achieved in past evaluations were frequently higher than recommended for treating chronic hypoxemia. We wondered if excessive amounts of oxygen were used which would exaggerate waste with conventional therapy, and, in turn, apparent savings with demand valves. Oxygen savings were evaluated with a demand valve in ten stable COPD patients who had recommended levels of PaO2 (55 to 65 mm Hg, SaO2 90 percent to 92 percent). The valve reduced oxygen use significantly compared to conventional therapy (average savings 28 percent, range 14 percent to 49 percent). The greatest savings were found in subjects who used the highest conventional flows.


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A. Cuvelier, J.-F. Muir, P. Czernichow, E. Vavasseur, F. Portier, D. Benhamou, and D. Samson-Dolfuss
Nocturnal Efficiency and Tolerance of a Demand Oxygen Delivery System in COPD Patients With Nocturnal Hypoxemia
Chest, July 1, 1999; 116(1): 22 - 29.
[Abstract] [Full Text] [PDF]


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Copyright © 1984 by the American College of Chest Physicians.