Document Detail

Performance characteristics of the second-generation remote emergency medical oxygen closed-circuit rebreather.
MedLine Citation:
PMID:  17590070     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Closed-circuit oxygen rebreathers may provide high concentrations of oxygen at extremely low flow rates appropriate for field use with limited oxygen supplies. The performance of the preproduction, second-generation remote emergency medical oxygen (REMO(2)) system developed for Divers Alert Network was evaluated. METHODS: The unidirectional circuit was made up of a solid, prepackaged CO(2) scrubber canister (984 +/- 14 [SD] g scrubber mass), standard 22-mm-inside-diameter anesthesia circuit hoses, 5-L breathing bag, 5-cm H(2)O positive end-expiratory pressure valve, and oronasal mask. Oxygen flow, inspired oxygen, expired CO(2), peak inspired and expired mask pressures, time to reach scrubber canister saturation or "breakthrough" (postscrubber CO(2) concentration reaching 3.8 mm Hg), and subject tolerance were measured under standard laboratory conditions. RESULTS: Six trials were completed using healthy volunteers (94.7 +/- 19.6 kg). Five of the 6 completed trials did not reach breakthrough at the planned trial limit of 8 hours. Mean average oxygen flow rate was 1.00 +/- 0.17 L x min(-1). Mean peak inspired and expired mask pressures were -5.0 +/- 1.9 and 6.5 +/- 1.9 cm H(2)O, respectively. Subjects generally reported good tolerance to circuit breathing. CONCLUSIONS: The second-generation REMO(2) was well tolerated by healthy subjects during 8-hour laboratory evaluation trials. The device provided high mean inspired oxygen fractions at low mean oxygen flow rates, relatively modest mean maximal inspired and expired pressures, and excellent scrubber canister duration. Further evaluation of field performance with a patient population is warranted.
Neal W Pollock; Michael J Natoli
Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Wilderness & environmental medicine     Volume:  18     ISSN:  1080-6032     ISO Abbreviation:  Wilderness Environ Med     Publication Date:  2007  
Date Detail:
Created Date:  2007-06-25     Completed Date:  2007-09-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9505185     Medline TA:  Wilderness Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  86-94     Citation Subset:  IM    
Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC 27710, USA.
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MeSH Terms
Carbon Dioxide / metabolism
Cross-Over Studies
Equipment Design
Middle Aged
Oxygen / metabolism*
Oxygen Inhalation Therapy / instrumentation*,  standards*
Positive-Pressure Respiration / instrumentation*
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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