吸氧去氮技术的研究进展

Research progress of preoxygenation techniques

在全身麻醉插管前实施吸氧去氮法可以增加氧储备,延长无通气安全时限。无通气期安全时限(DSA)是停止通气到指尖脉搏血氧饱和度(Sp O2)<90%的时间。吸氧去氮技术的目的是提供氧气并换走肺内氮气,有时也称作预充氧,在有效的预充氧前提下,患者可以忍受更长的呼吸暂停时期,对患者进行全麻诱导后可争取到更多的时间来建立安全的人工气道。此项技术对未预计到的困难通气、困难插管患者有着非常明确的价值。

Preoxygenation increases oxygen reserves and duration of safe apnea before general anesthesia. Duration of safe apnea is defined as the time until the SpO2 reaches 90%. The term ＂denitrogenation＂, indicating that nitrogen in the lungs is replaced by oxygen, is sometimes used instead of ＂preoxygenation＂. Sufficient preoxygenation provides valuable additional time to sure the airway before induction and extends the apnea time. These techniques may prove particularly valuable if mask ventilation or tracheal intubation are more difficult than expected.