外耳道压力改变对扫频探测音鼓室导纳图测试的影响

目的：观察外耳道压力改变条件下扫描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定导纳图测试。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

Effect of ear-canal air pressure variation on tempanometry using a sweep-frequency probe tone

Objective: By observing the effect of earcanal pressure variation (ECPV) on tempanometry using a sweepfrequency probe tone,the roles of sweepfrequency tempanograms changes were studied. Method: Tympanograms using a sweepfrequence probe tone were measured for 60 ears of 30 subjects at ECPV by admittance (Y),susceptance (B),conductance (G) with GSI33 middle ear analyzer. Result: There was not obviously difference about phase angle and resonance frequency among 3 measured conditions (P>0.05);Resonance frequency became higher with higher positive pressure and lower with lower negative pressure in earcanal;YG got lower with higher positive and lower negative pressure at resonance frequency;B is about 0 mmhos and almost didn't change with ECPV;phase angle decreased with higher positive or lower negative pressure.YG and were the highest at the peak pressure. Conclusion: The higher the earcanal positive pressure or the lower the negative pressure is,the higher the compliance and the lower the mass of middl