title: [Comparative study of decompression-induced formation of gas bubbles using ultrasonic equipment and the development of altitude-decompression disorders].
abstract: 442 altitude experiments on 40 volunteers were performed. Gas bubbles in venous blood were detected using an ultrasonic Doppler system functioning in a continuous mode at a frequency of 5 MHz. The threshold of bubble formation was identified in 31 test subjects and that of emergency of altitude-decompression disorders, in 28 test subjects. Individual resistance to decompression-induced bubbles was revealed. It was shown that the thresholds may vary with time, in the head-down position and in the head-down position combined with exercises. A correlation was established between the rate of intravascular bubble formation and the frequency of altitude-decompression disorders.
mesh_terms: D000328:Adult; D000531:Altitude; D001273:Atmosphere Exposure Chambers; D003665:Decompression Sickness / Q000097:blood / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D009584:Nitrogen / Q000097:blood*; D005082:Physical Exertion; D011187:Posture; D013997:Time Factors; D014463:Ultrasonography / Q000295:instrumentation
chemical_list: D009584:Nitrogen
vernacular_title: Sravnitel'noe izuchenie dekompressionnogo obrazovaniia gazovykh puzyr'kov s pomoshch'iu ul'trazvukovoĭ apparatury i vozniknoveniia vysotho-dekompressionnykh rasstroĭstv.