Investigation of a demand-controlled rebreather in connection with a diving accident.

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Investigation of a demand-controlled rebreather in connection with a diving accident.

Show simple item record Franberg, O en_US Ericsson, M en_US Larsson, A en_US Lindholm, P en_US 2012-03-13T12:30:05Z 2012-03-13T12:30:05Z 2011 en_US
dc.identifier.citation Undersea Hyperb Med. 2011 Jan-Feb;38(1):61-72. en_US
dc.identifier.isbn 1066-2936 en_US
dc.identifier.other 21384764 en_US
dc.description Undersea and Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc. en_US
dc.description.abstract This paper describes the examination of a Halcyon RB80 semi-closed underwater breathing apparatus used in a diving accident in 2007. The apparatus was supplied with trimix (oxygen, nitrogen and helium) containing 31% oxygen. The duration of the dive was 105 minutes at 28 meters' average depth in fresh water, with a 19-minute oxygen decompression stop at 6 meters. Upon surfacing the diver experienced seizures and signs of severe neurological deficits. The apparatus was tested with regard to the oxygen fraction drop from the supply gas to the breathing loop--i.e., the oxygen fraction inhaled by the diver (FiO2) was investigated. The FiO2 was measured and found to be lower than the value stated on the manufacturer's web page at the time of the accident. This investigation suggests that during the dive, the actual FiO2% was 17.9-25.3%, which is considerably lower than the FiO2% used for decompression calculations (30%). The underestimation of FiO2 resulted in too short and/or too few decompression stops during ascent. The low FiO2 would also put a diver at risk of hypoxia at shallow depths. It is concluded that inadequate information on the performance of the rebreather was a major contributing factor to this accident. en_US
dc.language.iso en en_US
dc.publisher Undersea and Hyperbaric Medical Society, Inc. en_US
dc.subject rebreather en_US
dc.subject RB-80 en_US
dc.subject case report en_US
dc.subject Decompression sickness en_US
dc.subject DCS en_US
dc.subject.mesh Algorithms en_US
dc.subject.mesh Carbon Dioxide/analysis en_US
dc.subject.mesh Decompression/standards en_US
dc.subject.mesh Diving/*adverse effects en_US
dc.subject.mesh Equipment Design en_US
dc.subject.mesh Equipment Failure Analysis/*methods en_US
dc.subject.mesh Glasgow Coma Scale en_US
dc.subject.mesh Humans en_US
dc.subject.mesh Male en_US
dc.subject.mesh Oxygen/*administration and dosage en_US
dc.subject.mesh *Oxygen Consumption en_US
dc.subject.mesh Product Labeling/standards en_US
dc.subject.mesh Reference Values en_US
dc.subject.mesh Work of Breathing en_US
dc.title Investigation of a demand-controlled rebreather in connection with a diving accident. en_US
dc.type Article en_US

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