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Altering blood flow does not reveal differences between nitrogen and helium kinetics in brain or in skeletal miracle in sheep.
J Appl Physiol (1985)
March 2015
Acute Care Medicine, The University of Adelaide, Adelaide, Australia; and.
In underwater diving, decompression schedules are based on compartmental models of nitrogen and helium tissue kinetics. However, these models are not based on direct measurements of nitrogen and helium kinetics. In isoflurane-anesthetized sheep, nitrogen and helium kinetics in the hind limb (n = 5) and brain (n = 5) were determined during helium-oxygen breathing and after return to nitrogen-oxygen breathing.
View Article and Find Full Text PDFSubmarine rescue decompression procedure from hyperbaric exposures up to 6 bar of absolute pressure in man: effects on bubble formation and pulmonary function.
PLoS One
January 2014
Equipe Résidante de Recherche Subaquatique Opérationnelle (ERRSO), Institut de Recherche Biomédicale des armées (IRBA), Toulon, France.
Recent advances in submarine rescue systems have allowed a transfer under pressure of crew members being rescued from a disabled submarine. The choice of a safe decompression procedure for pressurised rescuees has been previously discussed, but no schedule has been validated when the internal submarine pressure is significantly increased i.e.
View Article and Find Full Text PDFRecreational technical diving part 2: decompression from deep technical dives.
Diving Hyperb Med
June 2013
Navy Experimental Diving Unit, Panama City Beach, FL 7012, USA.
Technical divers perform deep, mixed-gas 'bounce' dives, which are inherently inefficient because even a short duration at the target depth results in lengthy decompression. Technical divers use decompression schedules generated from modified versions of decompression algorithms originally developed for other types of diving. Many modifications ostensibly produce shorter and/or safer decompression, but have generally been driven by anecdote.
View Article and Find Full Text PDFScope and design of the GUSI international research program.
Undersea Biomed Res
July 1992
Hyperbaric Center, Duke University Medical Center, Durham, North Carolina 27710.
During the 1980s a large new simulated underwater saturation diving system was constructed at GKSS, Geesthacht, Germany. This German Underwater Simulator (GUSI) has performed over 18 trimix (helium, 5% nitrogen, oxygen) dives with 115 divers at depths to 600 m, including 9 to 450 m or deeper for a total of 2672 man-days of saturation and 994 days of welding and other work. From October 1989, an international research program was initiated to permit scientists from other countries to carry out physiologic and medical research during these working dives.
View Article and Find Full Text PDFRespiratory effects of cold-gas breathing in humans under hyperbaric environment.
Respir Physiol
September 1990
Laboratoire de Biologie des Hautes Pressions, (URA 1330 CNRS) Faculté de Médecine-Nord, Marseille, France.
Changes in total lung resistance (RL) during inhalation of cold gas mixtures were measured in 4 human volunteers during an experimental dive at 46 ATA. The subjects breathed helium-nitrogen-oxygen mixtures during the decompression schedule, and measurements were performed at 46, 36, 21, 12.5, 6 and 2 ATA (1 ATA = 100 kPa).
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