目的探讨胃腔内病原菌定植的影响因素以及胃腔定植菌在机械通气相关性肺炎（VAP）内源性发病机制中的作用。

Objective To investigate the risk factors for gastric bacterial colonization and its role in the endogenous pathogenesis of ventilator-associated pneumonia (VAP).

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比较两组气管切开率、入住icu时间、机械通气时间、呼吸机相关性肺炎发生率、镇痛剂使用时间等指标。

Two groups were compared with the rate of tracheotomy, ICU stay time, mechanical ventilation, ventilator-associated pneumonia incidence, the time of analgesic use and other indicators.

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