The third step was to sit at the edge of the seat and then gradually ease into the normal sitting position.
第三个步骤：先“半坐”在座上，然后再慢慢挪成“全坐”。
Conclusions During neurosurgical procedure under general anesthesia and sitting position, pulmonary vascular auto regulation can be preserved and pulmonary oxygenation can be kept in normal.
结论神经外科手术坐位全身麻醉期间，肺血管能保持自主调节功能，维持肺氧合功能在正常水平。
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