PURPOSE:Determine the pulse volume (PV) and oxygen purity (O2) delivered by three portable oxygen concentrators (POC)in a bench setting.
METHODS:The SeQual Eclipse, Inogen One, and AirSep FreeStyle were tested in a bench model simulating spontaneous breathing. POC devices were tested using continuous flow (SeQual only) and at settings of 1–5. The AirSep max setting is 3. Simulated respiratory frequency was 12, 24, and 36/min with a tidal volume of 300 ml. Pulse volume delivered by the POC was measured with a flowmeter and O2 with a rapid response O2 analyzer.
RESULTS:The Eclipse provided an O2 of 0.95–0.955 during continuous flow. At a pule dose setting of 3 the O2 was 0.95 for all POC devices with a RR of 12/min. At a RR of 24/min the O2 for the AirSep fell to 0.83. At a RR of 36/min the AirSep O2 was 0.60. The Inogen POC maintained constant O2, but at RR > 30 only delivered a pulse every other breath. PV for SeQual was 50 mL, for Inogen was 24 ml, and for AirSep was 23 ml at a setting of 3. At a setting of 1 PV was 17 ml for SeQual, 7 ml for Inogen, and 8 ml for AirSep.
CONCLUSION:POC performance varies widely between devices with respect to PV and O2. The larger SeQual device provided the most consistent O2 and PV. The Inogen device protects O2 by limiting the number of pulses per minute.
CLINICAL IMPLICATIONS:POC using pulse dose technology are designed to enhance patient quality of life and mobility. Acutal delivered O2 is affected by patient RR and POC PV and O2. At higher RR patients may receive significatly lower O2 than prescribed.
DISCLOSURE:Richard Branson, No Financial Disclosure Information; No Product/Research Disclosure Information