Low-concentration Oxygen Therapy Via a Demand Oxygen Delivery System

Tiep, Brian; Nicotra, M. Brooke; Carter, Rick; Phillips, R. E.; Otsap, Ben

doi:10.1378/chest.87.5.636

Cited by 35 publications

(21 citation statements)

References 4 publications

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“…For this device, oxygen flow began when negative pressure was detected and when positive pressure ceased. Tiep et al 16 invented the first prototype for contemporary PF oxygenconserving systems in 1985. This battery-operated device delivered 25 mL at the beginning of inspiration.…”

Section: Discussionmentioning

confidence: 99%

Effect of the Anatomic Reservoir on Low-Flow Oxygen Delivery Via Nasal Cannula: Constant Flow Versus Pulse Flow With Portable Oxygen Concentrator

Zhou

Chatburn

2014

Respir Care

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BACKGROUND: The F IO 2 for a nasal cannula with constant flow (CF) depends on the anatomic reservoir (AR), which is affected by changes in frequency and end-expiratory flow. Conversely, pulse flow (PF) devices do not require the AR. The purpose of this study was to compare the F IO 2 delivered by a nasal cannula supplied by CF via oxygen tank with that delivered by PF delivered via portable oxygen concentrator. Hypotheses were (1) a lung model of COPD with non-zero end-expiratory flow decreases F IO 2 for CF more than for PF, and (2) CF and PF perform differently in terms of F IO 2 delivery, despite having equivalent settings. METHODS: Normal and COPD lung models were simulated (IngMar Medical ASL 5000) using published human data: normal: breathing frequency ‫؍‬ 15 breaths/min, R in ‫؍‬ 4 cm

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Section: Discussionmentioning

confidence: 99%

Effect of the Anatomic Reservoir on Low-Flow Oxygen Delivery Via Nasal Cannula: Constant Flow Versus Pulse Flow With Portable Oxygen Concentrator

Zhou

Chatburn

2014

Respir Care

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“…Effective oxygen saving ratio was derived while delivering the equivalent FIO 2 to the lungs, it stand for the actual oxygen saving of DOD method compared to CFO method. It has been reported that conventional oxygen saving ratio of a DOD method had higher values up to 9.05 (Tiep and Lewis, 11 al., 19 7.55~9.05). 11,19 However, reported high oxygen saving ratios appear to be caused by the fact that equivalent FIO 2 was not considered, since conventional oxygen saving ratio was calculated as the ratio of volume of supplied oxygen by six nominal setting values in CFO to that of supplied oxygen by corresponding six setting values in DOD.…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported that conventional oxygen saving ratio of a DOD method had higher values up to 9.05 (Tiep and Lewis, 11 al., 19 7.55~9.05). 11,19 However, reported high oxygen saving ratios appear to be caused by the fact that equivalent FIO 2 was not considered, since conventional oxygen saving ratio was calculated as the ratio of volume of supplied oxygen by six nominal setting values in CFO to that of supplied oxygen by corresponding six setting values in DOD. The effective oxygen saving ratio suggested in this study may provide the real index of economic oxygen saving of the DOD method while maintaining the same treatment effect compared CFO method.…”

Section: Discussionmentioning

confidence: 99%

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The effectiveness of oxygen conserving device of a demand oxygen delivery system based on FIO2 equivalency

Hwan

Kim

Shin

et al. 2011

Int. J. Precis. Eng. Manuf.

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Recently demand oxygen delivery (DOD) system has been preferred to continuous flow oxygen (CFO) method for long term oxygen therapy in patients with chronic obstructive pulmonary disease, since DOD system supplies oxygen during only inhalation and saves oxygen consumption. However, the oxygen saving ratio have not properly compared without considering fraction of inspired oxygen (FIO 2 ), though FIO 2 determines the efficacy of treatment. The purpose of this study was 1) to investigate the equivalence between the CFO method and a DOD system in terms of FIO 2 with considering dead space under various breathing parameters, 2) to propose and calculate the new effective oxygen saving ratio of the DOD method, 3) to compare FIO 2 obtained from calculation with that from experiment. The mathematical and experimental models of human respiratory system were developed. FIO 2 was calculated depending upon various breathing parameters and the new effective oxygen saving ratio was calculated to accurately compare oxygen saving consumption between the DOD and CFO method. Results of this study have shown that as supplied volume of oxygen increased, FIO 2 linearly increased. As beat per minute or tidal volume increased, FIO 2 decreased. The obtained FIO 2 between mathematical model and experiment showed errors less than 5% in CFO method and less than 11% in DOD method. Effective conserving oxygen ratios of the DOD system changed between 3.4 and 3.8, but had higher values when the volume of supplied oxygen was larger. In conclusion, CFO method had different equivalent values of FIO 2 depending on breathing parameters. Therefore it is appropriate to take into account of FIO 2 when considering performance of oxygen saving devices. The effective oxygen saving ratio proposed in this study may provide the new valuable index of oxygen saving of the DOD method while maintaining the same treatment effect compared with CFO method. In addition, the mathematical model developed in this study seems to predict FIO 2 similarly as obtained using experiment.

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“…The Oxymatic (Chad Therapeutics) was evaluated in 12 patients with "chronic lung disease." 64 To achieve an SaO 2 measured by ear oximetry of 92% at rest required an average of 1.28 liters/min of oxygen delivered by continuous nasal flow but only 0.153 liter/min of flow using the demand delivery device. This represents an oxygen savings of 88%.…”

Section: Demand Oxygen Conserversmentioning

confidence: 99%