方法：对连续使用机械通气不少于5天的非免疫抑制患者进行评估。
Methods: All consecutive nonimmunocompromised patients receiving mechanical ventilation for 5 days or more were evaluated.
过去的一些研究显示在其他条件下受抑制的自身调节可经过度通气恢复。
Previous investigations in several other conditions have demonstrated that impaired autoregulation can be restored by hyperventilation.
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