Demand oxygen systems have been shown to be effective in treating hypoxemia during seated rest and during exercise, but the performance of thesesystems during sleep has not been previously studied.
We compared the efficacy of a new demand oxygen saver system with that of continuous flownasal oxygen during seated rest, and exercise. Six the usual activities of daily life including sleep, hypoxemic patients were studied. All six had chronic obstructive pulmonary kyphoscoliosis with mixed obstructive and disease, though one patient had restrictive lung disease.
Patients were studied during each activity of daily life while receiving supplemental oxygen by continuous flow nasal cannula at 2 liters and during use of the demand oxygen saver system. The demand per minute produced arterial oxygenation equivalent to continuous flow nasal oxygen system cannula under all conditions while utilizing substantially less oxygen.
When compared with administration of oxygen by continuous flow nasal cannula,the demand oxygen saver cannula utilized only 45 percent as much oxygen during percent as much seated rest, 44 percent as much oxygen during exercise, and 39 oxygen during sleep. Our data support the use of demand oxygen systems for treatment of hypoxemia in patients with chronic obstructive lung disease.