《altitude decompression sickness》由会员分享，可在线阅读，更多相关《altitude decompression sickness（6页珍藏版）》请在金锄头文库上搜索。
1、Altitude decompression sicknessIn order to get extensive kwon about altitude decompression sickness, first we should kwon what is altitude decompression sickness?Objective While the technology of the molecular sieve oxygen generation system(MSOGS) onboard was used, pilots could not breathe pure oxyg
2、en to eliminate nitrogen during a high altitude flight. There is no report whether it is a threat to altitude decompression sickness(ADS) or not in that condition. This experiment was intended to observe the effects of breathing different oxygen-rich gases of MSOGS on denitrogenation, so that we cou
3、ld make the medical physiological requirements for MSOGS on-board and provide experimental basis for aeromedical supply. Method Eight healthy males were breathed oxygenrich gases(60%,70%,80%,90%and 99.6%) in turn for 60 min, and the concentration of nitrogen, oxygen, carbon dioxide and argon at the
4、end of expiration interval in the oxygen mask were continuously measured by a flight mass spectrometer through the oxygen mask. According to the variety of the denitrogenation rate by breathing different oxygen-rich gases, its change law was analyzed.Results There were significant differences(P0.05)
5、 about denitrogenation rate in different oxygen-rich gases due to different oxygen concentration and breathing time. The denitrogenation rate of pure oxygen was higher than that of the others. It was indicated that the concentration of nitrogen in lung would decrease along with the increase in oxyge
6、n concentration of oxygen-rich gases, and the nitrogen concentration in the lung almost decreased by 50% or even more if people were breathed 60%90% oxygen-rich gas longer than 60 s. Conclusion The man-made respiration environment of low nitrogen can be provided by breathing oxygen-rich gases, altho
7、ugh the denitrogenation velocity of breathing oxygen-rich gases is lower than that of breathing pure oxygen. So it can be used as a measure to eliminate and lower the nitrogen in the body to prevent from ADS.【Author】 Hua-jun XIAO, Xiao-peng LIU, Bin ZANG, Gui-you WANG, Zhao GU Institute of Aviation
8、Medicine, Beijing 100142,China【机构】 Institute of Aviation MedicineThe we will make Classification of high-altitude decompression sicknessAltitude decompression sickness are classified as follows: limb disorders: intestinal or leg pain. choking: difficulty breathing, feeling strange choking gas. nerve
9、 decompression sickness: spinal cord: numbness, paresthesia, weakness, paralysis; brain type: headache, visual disturbances. systemic decompression sickness: choking, severe limb flexor disease, severe neurological dysfunction. cutaneous decompression sickness: itching, formication.Predisposing fact
10、ors altitude decompression sickness:Altitude decompression sickness predisposing factors are: the height of which, the previous low-exposure, flying after diving, age, exercise, joint injury, obesity and so on.The reason high-altitude decompression sickness occurUsually in a pressurized state within
11、 the passenger and transport aircraft, the aircraft pressurization device failure, accident or pressure can cause drastic altitude decompression sickness; at high altitude physiology training, a short time by a high-pressure environment into a low pressure environment, repeated exposure to low press
12、ure and participate in flight training after intense exercise can cause high-altitude decompression sickness.Clinical manifestations of decompression sicknessDecompression sickness is a disease involving the body organs organization, variety of clinical manifestations. According to clinical investig
13、ation of patients with a single symptom only accounted for 70%, with two kinds of symptoms (25.6%), two or more accounted for 4.4%. A variety of symptoms usually itching, rash, pain, numbness, muscle weakness and other symptoms appeared earlier, but then other symptoms.The vast majority of symptoms
14、occurred within 1 2h after decompression. The incidence of 9.1% in the number of the decompression process onset of the total, accounting for 50% of the decompression after 30min, 1h accounted for 85%, 3h accounted for 95%, 6h accounted for 99%, 6 36h only 1%. The faster decompression, symptoms soon
15、er, the more severe the disease.1. SkinEffects of decompression sickness skin to skin itching and burning skin is most common. Itching can occur in localized or systemic involvement, subcutaneous fat at the weight. This is mainly due to the bubbles to stimulate the skin peripheral nerves, skin, bloo
16、d vessels are air embolism, causing ischemia (pale) and venous congestion (purple) coexist, was marble-like markings, amount of gas in the subcutaneous tissue can be formed emphysema .2. Musculoskeletal SystemAbout 90% of patients with decompression sickness occurs limb pain, pain after exertion light there, might was beat, acupuncture or tearing unbearable pain, limb remain bent position, in order to relieve pain, and said Qu li
