| Autor: |
Dong-qing WEN, Xue-wen ZHENG, Gui-you WANG, Xiao-peng LIU, Wei-ru SHI, Li-hua YU, Zhao GU, Jian-bing WU, Li-hao XUE, Jie WANG |
| Jazyk: |
čínština |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Medical Journal of Chinese People's Liberation Army, Vol 42, Iss 1, Pp 70-75 (2017) |
| ISSN: |
0577-7402 |
| Popis: |
Objective To compare the ear baric function between 4000m altitude chamber test with inhaling air and 6900m altitude chamber test with inhaling pure oxygen. Methods Eleven healthy male volunteers attended two tests as two groups by self-comparison. As the air group the volunteers inhaled air at 4000m, while as the pure oxygen group they inhaled pure oxygen at 6900m altitude, and the time interval between the two tests was more than two weeks. During the test, the volunteers breathed air or pure oxygen at random for 1h, and then were exposed at a speed of 20m/s to the target altitude for 5min. Hereafter they were sent back to the ground at the same speed. The changes of subjective symptoms, degree of tympanic congestion, acoustic immitance index and pure-tone auditory threshold were recorded before and after the test. The acoustic impedance index and pure-tone threshold were statistically analyzed. Results Four volunteers (4 ears) in air group and 7 volunteers (7 ears) in pure oxygen group reported ear pain in altitude chamber exposures, respectively. The pain-triggering altitude was higher in the pure oxygen group. Immediately after tests, there were 3 (3 ears) and 5 volunteers (5 ears) with Ⅲ degree congestion of the tympanic membrane in the two groups respectively. Four volunteers (6 ears) developed gradually aggravated hemorrhages after altitude exposure. And the tympanic membrane congestion difference between groups was statistically significant at 3 and 24h after tests (P |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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