OBJECTIVETo analysis deacclimatization symptom scores of 159 youth from Karakoram and Tibet Ali area, and provide the basis for the development of relevant prevention and control measures.

METHODSUsing the method of epidemiological symptoms questionnaire, 18 symptoms of 190 youth who returned to the plain area from the different plateau were investigated. The symptom scores of different altitude, age, the time of staying, different units, continuous or intermittent stage and education were surveyed.

RESULTSDeacclimatization symptom scores among 5,000 meter groups were significantly higher than those of 4,300 meter and 3,700 meter group (P < 0.05, P < 0.01). There was no significant difference between the 4,300 meter group and the 3,700 meter group (P > 0.05). There were significant differences among the stayed personnel (different age, position, unit, education, time, continuous or intermittent) (P < 0.01). There was significant difference between the continuous defended the group and intermittent group (P < 0.01).

CONCLUSIONDeacclimatization symptom scores were related to the plateau exposure time, altitude, workload, plateau continued exposure. The older, the longer exposure, the higher altitude, the greater workload at plateau were showed higher deacclimatization symptom score.

Acclimatization ; Altitude ; Altitude Sickness ; physiopathology ; Humans ; Surveys and Questionnaires ; Tibet

The incidence of deacclimatization to high altitude syndrome (DAHAS) prevailed up to 80% in highland troops, and 100% in manual workers, and severe DAHAS could significantly affects patients' health, work and life. So it is imperative to develop effective prevention and treatment measures for DAHAS. The present review analyzes effective prophylactic and therapeutic measures against DAHAS, implemented at our hospital.
Acclimatization ; Altitude ; Altitude Sickness ; prevention & control ; therapy ; Humans

Altitude ; Altitude Sickness ; prevention & control ; Health Services Administration ; Humans

Altitude ; Altitude Sickness ; Animals ; Hypoxia ; Iron ; Mice ; Spleen

BACKGROUND: This study is aimed to analyze the results of aeromedical consultation of ROKAF for recent 10 years. METHODS: We reviewed the records of all ROKAF rated personnel who developed a medical problem requiring aeromedical consultation during the period from 1991 to 2000. RESULTS: We collected 263 cases. The most frequent clinical categories were ENT and musculoskeletal problems. In the group of fighter pilots, 30 cases were classified into permanent grounding. Chronic hepatitis and Herniated disc were the main causes. In the group of undergraduate pilots, aerotitis media by high altitude flight and airsickness by high performance flight, were the main causes. CONCLUSION: According to this study, we need to reinforce the supervision about the revealed major causes.
Altitude ; Hepatitis, Chronic ; Intervertebral Disc Displacement ; Motion Sickness ; Organization and Administration

OBJECTIVETo investigate the correlation between the expression of microRNA-451 in red blood cells and chronic mountain sickness(CMS).

METHODSPeripheral blood samples were collected from emigrant CMS patients (28 cases), localized CMS patients (12 case), emigrant healthy people (24 case) and localized healthy people (22 case). The microRNA-451 expression in red blood cells was measured by the RT-PCR. The results combined with the clinical data of patients were analysed.

RESULTSThe expression of microRNA-451 in emigrant CMS patients was higher than that in emigrant healthy people (P<0.05); the expression of microRNA-451 in localized CMS patients was higher than that in localized healthy people (P<0.05); the microRNA-451 expression had no statistical difference between emargant and localized healthy people. The level of hemoglobin in CMS patients was positively correlated with the expression of microRNA-451 in red cells (r=0.701).

CONCLUSIONThere is a certain level of microRNA-451 in healthy people, the expression of microRNA-451 in CMS patients is significantly higher than that in healthy people. MicroRNA-451 may play an important role in the process of chronic mountain sickness.

Altitude Sickness ; Chronic Disease ; Erythrocytes ; Hemoglobins ; Humans ; MicroRNAs

Altitude Sickness ; Chronic Disease ; Humans ; Male ; Middle Aged ; Occupational Diseases

Altitude Sickness ; diagnosis ; Humans ; Occupational Diseases ; diagnosis ; Reference Standards

Acute mountain sickness (AMS) is a clinical syndrome of multi-system physiological disorder after acute exposure to low pressure and low oxygen at high altitude. Quantitative proteomics can systematically quantify and describe protein composition and dynamic changes. In recent years, quantitative proteomics has been widely used in the prevention, diagnosis, treatment and pathogenesis of many diseases. This review summarizes the progress of quantitative proteomics techniques and its application in the prevention, diagnosis, treatment of AMS and mechanisms of rapidly acclimatizing to plateau, in order to provide a reference for the pathogenesis, early intervention, clinical treatment and proteomic research of AMS.
Humans ; Altitude Sickness/prevention & control* ; Proteomics ; Acute Disease ; Oxygen/metabolism*

OBJECTIVEWhile the technology of the molecular sieve oxygen generation system(MSOGS) onboard was used, pilots could not breathe pure oxygen 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 could make the medical physiological requirements for MSOGS on-board and provide experimental basis for aeromedical supply.

METHODEight healthy males were breathed oxygen-rich 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 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.

RESULTSThere were significant differences (P < 0.05) 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 oxygen 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.

CONCLUSIONThe man-made respiration environment of low nitrogen can be provided by breathing oxygen-rich gases, although 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.

Altitude ; Altitude Sickness ; prevention & control ; Carbon Dioxide ; Decompression Sickness ; prevention & control ; Humans ; Male ; Nitrogen ; Oxygen ; therapeutic use ; Respiration