Chest
Clinical InvestigationsPerformance of a Demand Oxygen Saver System during Rest, Exercise, and Sleep in Hypoxemic Patients
Section snippets
Study Population
Six patients were selected for study. All had chronic lung disease with resultant hypoxemia, and all were judged clinically stable. All but one subject had a PaO2 of 58 mm Hg or less breathing room air on the first day of study. The one exception, subject 1, had an initial PaO2 measured at 62 mm Hg but was retained as a study subject because a second arterial sample drawn later the first study day did demonstrate a PaO2 of less than 59 mm Hg. The two subjects with PaO2 values during room air
Seated Rest
Table 2 lists the results of blood gas testing after one hour of seated rest on the two oxygen delivery systems and the percentage oxygen use with the COS. As Figure 1 illustrates, arterial Po2 values achieved by the two systems fall very near the line of identity. Oxygen saturation data obtained from ear oximetry yielded very similar results, but the increased sensitivity of oxygen partial pressure measurements in the range of values observed lead us to emphasize blood gas data for this
Discussion
The development of oxygen delivery systems designed to maintain adequate arterial oxygenation while utilizing less oxygen has been motivated by the desire to reduce the cost of oxygen administration and to provide patients with prolonged oxygen availability from portable oxygen sources. Although there has been increasing evidence that these goals can be achieved, the widespread use of oxygen conserving devices awaits demonstration that these devices are durable and will function reliably under
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Cited by (42)
Comparison of supplemental oxygen delivery by continuous versus demand based flow systems in hypoxemic COPD patients – A randomized, single-blinded cross-over study
2019, Respiratory MedicineCitation Excerpt :Up to now there are only few studies that compared DODS and CF oxygen devices and results are heterogeneous. Two studies found that DODS devices are inferior to maintain oxygen saturation compared to CF devices in COPD patients during exercise [16,17] while other studies found no relevant differences concerning the oxygen saturation during exercise [14,18–22]. These studies used the 6- or 12-minute walk test, an incremental shuttle walk test or treadmill walking for exercise.
Long-Term Oxygen Therapy
2009, Asthma and COPDLong-term oxygen therapy
2008, Asthma and COPD: Basic Mechanisms and Clinical ManagementOxygen-conserving devices: A forgotten resource
2007, Archivos de BronconeumologiaComparison of two demand oxygen delivery devices for administration of oxygen in COPD
2005, ChestCitation Excerpt :When a DODS is being titrated, oxygen should be administered for > 15 min before a blood gas analysis is performed, since the Po2 continues to increase between the 15 and 30 min of use. This is also in conformity with the results of other publications,710 in which oxygen equilibrium was established only after 30 min. In other studies, measurements were carried out after only 10 min11 or 15 min.12
Comparison of four demand oxygen delivery systems at rest and during exercise for chronic obstructive pulmonary disease
2004, Respiratory MedicineCitation Excerpt :No other long-term efficacy and safety data are available. Nocturnal oxygenation seems satisfactory.6,13,20 Similar sleep quality with DODS and CFO has been reported, with the DODS providing 60% oxygen savings.5
Manuscript received June 25; revision accepted January 29.