急性缺氧对飞行员胃液排空功能的影响

Effects of acute hypoxia on liquid gastric emptying in pilots

为探讨急性缺氧对飞行人员胃液体排空功能的影响，在常压下吸入不同浓度氧（17％、16％、14％、12％、10．5％及9％）的低氧混合气体30min，采用B型超声波在实验前后分别测量了64名男性飞行员的胃液体排空功能。结果表明，吸入17％低氧混合气胃排空延迟，但经统计学处理无显著性差异（P＞0．05），吸入16％以下的低氧混合气后胃排空延迟，经统计学处理有显著性差异（P＜O．01），且随着缺氧程度加重，胃液体排空时间延长更加明显。提示当发生高空缺氧时，应考虑到缺氧对胃排空有抑制作用这一因素。

To study effects of acute hypoxia on liquid gastric emptying function in flight person-nel, 64 male pilots underwent hypoxic exposures by inhaling various hypoxic mixtures under normal pressure with oxygen concentrations 17 %、 16 %、 14M、 12 %、10. 5 % and 9 % respectively. Each experi-ment lasted 30 minutes and intervals between experiments were 4 days at least. Real-time ultrasono-graphy was used to determine the liquid gastic emptying function before and after each experiment. The results showed that after inhalation of gas mixture with 17% oxygen trended to Prolong insignificantly the liquid gastric emptying time,while after inhalation of hypoxic mixture with 16% O2 or less, the liq-uid gastric emptying titne was significantly prolonged (P>0.01). The lower the O2 concentration the longer the emptying time. It indicates that depression of liquid gastric emptying function should be con-sidered during high altitude hypoxia.