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Long term oxygen therapy using portable oxygen devices pulsed oxygen delivery via demand system at rest and during exercise



Long term oxygen therapy using portable oxygen devices pulsed oxygen delivery via demand system at rest and during exercise



Atemwegs-und Lungenkrankheiten 18(5): 175-180



The use of oxygen-conserving devices in long-term oxygen therapy may result in substantial cost saving due to reduced oxygen consumption and the ability to supply oxygen continuously during ambulation by allowing the use of smaller portable oxygen sources. Response to pulsed nasal oxygen delivery at rest and during submaximal exercise was assessed in 10 patients presenting with severe chronic obstructive pulmonary disease and 10 patients with restrictive pulmonary disease, all of whom were hypoxemic on exercise without oxygen. Measurements were taken by blood gas analysis at rest and during exertion with and without oxygen. Oxygen was supplied using the demand system Oxytron (Fa. Weinmann, Hamburg) which limits oxygen flow to the early phase of inspiration. 17 patients underwent both settings (mean exercise level on bicycle ergometer 0,7 watt/kg), the remaining 3 patients could effort low-level exercising with oxygen only. In 15 patients desaturation induced by exercise was prevented by nasal pulsed oxygen supply. Undersensing due to decrease inspiratory nasal flow during exercise limited response to oxygen therapy via demand system in 3 patients. Response was not predictable by patient's diagnosis, lung function measurements, breathing frequency or blood gas analysis at rest. Thus exercise testing during pulsed oxygen delivery prior to prescription of portable oxygen devices is mandatory.

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Accession: 007522220

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