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目的：观察外耳道压力改变条件下扫频探测音鼓室导纳图测值的变化，揭示在该状态下扫频探测音鼓室导纳图变化的实质。方法：用ＧＳＩ３３型声导纳仪对３０例（６０耳）正常听阈者行不同外耳道压力条件下的扫频探测音鼓室导纳图测试。结果：Ｙ、Ｂ、Ｇ三种测试方式之间的共振频率、相位角无显著性差异（Ｐ＞０．０５）；共振频率随外耳道正压值的增大而增大，随负压值的增大而减小；共振频率点的补偿声导纳和声导值随正、负压值的增加而减少，补偿声纳值保持在０ｍｍｈｏｓ附近，不随压力的变化而变化，相位角值随正、负压的增加而变小，峰压时补偿声导纳值、声导值、相位角值最大。结论：外耳道正压增大或负压减小，可引起中耳劲度的相对增加和中耳质量的相对减少，正常峰压时，中耳的磨擦力最小
OBJECTIVE: To observe the change of measurement of tympanometry admittance under the condition of external auditory canal pressure changes, and to reveal the essence of the change of admittance diagram of sweeping probe drum in this condition. Methods: 30 cases (60 ears) normal listeners were tested with swept tone tympanogram under different external auditory canal pressure with GSI33 type acoustic admittance instrument. Results: There was no significant difference in the resonance frequency and phase angle between Y, B and G (P> 0.05). The resonance frequency increased with the increase of positive pressure of external auditory canal, Increases and decreases. The compensated acoustic admittance and acoustic guidance value at the resonance frequency point decrease with the increase of positive and negative pressure values, the compensation sonar value remains near 0mmhos, does not change with pressure, and the phase angle value increases with the positive , Negative pressure increases and decreases, the peak pressure compensates the acoustic admittance value, the acoustic guide value, the largest phase angle value. Conclusion: The increase of positive pressure or negative pressure of external auditory canal can cause the relative increase of middle ear stiffness and the relative decrease of middle ear mass. The friction force of middle ear under the normal peak pressure is the smallest