After mask oxygen inhalation, the blood flow velocity returned to preoperative level.

面罩吸氧后脑血流速度又恢复至手术前状态。

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Continuous epidural anesthesia were performed after basal anesthesia, and assistant respiration were performed with mask oxygen inhalation.

基础麻醉后行连续硬膜外麻醉，常规紧闭面罩给氧、辅助呼吸；

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Objective: to prove oxygen mask oxygen inhalation device effectiveness in order to better educate patients, and improve the effectiveness of its use.

目的：证明氧气雾化吸入器面罩吸氧的有效性，以便更好的向病人进行宣教，提高其利用效能。

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