Methods The data in HCT was collected in 170 aircrew with barotraumas and classification statistic was did.
方法收集耳气压伤和鼻窦气压伤住院的飞行人员低压舱检查资料170份，对其进行分类统计。
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Conclusions When environmental pressure was added, positive pressure breathing higher than the ventilative resistance of the Eustachian tube could prevent ear barotraumas.