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1·Conclusion Endotracheal bacterial contamination may be caused by unprotective classical endotracheal intubation and could be reduced by protective endotracheal intubation.

结论 传统气管插管操作方法可以引起气管内细菌污染， 而保护性气管插管操作方法可能较有效地减少气管内细菌污染。