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Changes in rat respiratory behavior under varying PCO2 levels and argon content in hyperbaric Ar-O2-CO2 atmospheres
respiratory carbon dioxide argon animal rat
2009/7/20
An anesthetized rat preparation has been used for breathing studies in hyperbaric Ar-O2-CO2 atmospheres in which total saturation pressure was varied in the range 1-19.1 ATA and PCO2 was set at levels...
Alterations of the human vestibulo-ocular reflex in a simulated dive at 62 ATA
retinal eye human
2009/7/20
In an attempt to investigate some aspects of the high pressure nervous syndrome, the vestibulo-ocular reflex (VOR) gain was measured in two professional divers undergoing a simulated dive at 62 ATA. T...
Effects of a hyperbaric environment on respiratory and monoamine oxidase activities
hyperbaric respiratory monoamine oxidase
2009/7/20
The effects of a prolonged hyperbaric environment (21 ATA He-O2, 200 +/- 30 mm Hg O2, 32.5 +/- 1 degrees C) were investigated on the respiratory activity of rat liver homogenates and the activity of m...
Effects of nicotinic acid on plasma volume loss of experimental dysbarism
decompression drug animal dog Plasma volume
2009/7/20
Two groups of dogs anesthetized with sodium pentobarbital were subjected to compression of 60 psig for 60 min and decompressed at the rate of 10 psi/min without staging. Plasma volume was measured in ...
Longitudinal study of performance after deep compressions with heliox and He-N2-O2
human heliox trimix
2009/7/20
This study concerns three hyperbaric experiments. During SAGITTAIRE iv, compression to 610 msw was accomplished in 11 days with an atmosphere of helium-oxygen. For the two CORAZ experiments, compressi...
Respiratory gas exchange and lung perfusion in man during and after head-out water immersion
CO2 carbon dioxide carbon monoxide pulmonary human CO
2009/7/20
The respiratory gas exchange for O2, CO2, and CO has been studied in nine healthy male subjects before, during, and after head-out water immersion. Distribution of lung perfusion and ventilation were ...
A fluorocarbon emulsion with a high solubility for CO2
fluorocarbon Solubility Carbon Dioxide
2009/7/20
A stable emulsion can be prepared by subjecting a mixture of 30 percent (by volume) FC-80 fluorocarbon; a 0.3-M THAM solution titrated to pH 7.4 with HCl; and 0.04 g F68 Pluronic surfactant per millil...
A deep-diving system has been designed for use with colonies of small rodents at pressures up to 170 ATA. The system consists of a triple-envelope arrangement in which a modular habitat serves as the ...
Effects of increased O2-N2 pressure and breathing apparatus on respiratory function
human nitrox exercise breathing apparatus respiratory work of breathing
2009/7/20
The ventilatory response of four subjects was measured at rest and various intensities of exercise. Experiments were conducted in a dry pressure chamber (1) at 1 ATA and 4 ATA with the subjects breath...
Gas phase separation during decompression in man:ultrasound monitoring
decompression human Doppler
2009/7/20
During two dive series, one to 132 fsw and one to 210 fsw, Doppler ultrasonic bubble detectors were used to monitor venous gas bubbles in divers during decompression and for 30 min thereafter. Various...
Narcotic potency of N2, A, and N2O evaluated by the physical performance of mouse colonies at simulated depths
animal mice narcosis nitrogen argon nitrous oxide
2009/7/20
The physical performance of colonies of deer mice was studied in various inert gas environments at pressures up to 31 ATA. The mice were housed in habitats wherein their diurnal running activity and s...
Scanning electron microscopy of normoxic and hyperoxic hyperbaric exposed lungs
pulmonary guinea pig animal
2009/7/20
Lungs from adult guinea pigs exposed to 1 ATA He-O2 with 200 mm Hg PO2 and 20 ATA He-O2 with 200, 400, and 600 mm Hg PO2 were studied with scanning electron microscopy. The appearance of normal alveol...
Critical flicker frequency (CFF) and subjective fatigue during an oxyhelium saturation dive at 62 ATA
saturation human heliox fatigue neurophysiological performance
2009/7/20
Two divers spent over 50 hours at 610 msw in a helium-oxygen mixture (PO2:0.38-0.52 ATA). The dive duration was 27 days, including predive stages of confinement, compression, time at maximum pressure,...
Reversal of nitrogen narcosis in rats by helium pressure
nitrogen narcosis nitrogen helium animal rat
2009/7/20
Changes in operant behavior were obtained for rats breathing nitrogen, helium, and both gases combined. Exposure to 12.9 ATA of nitrogen (O2 maintained at normobaric value of 0.2 ATA) produced complet...
Alterations in long-bone regional blood flow associated with inadequate decompression in dogs
decompression aseptic bone necrosis DYSBARIC OSTEONECROSIS
2009/7/20
Alterations in long-bone regional blood flow associated with inadequate decompression in dogs.