Wang H, Zhong N
Department of Otolaryngology, Union Hospital, Tongji Medical University, Wuhan 430022.
Lin Chuang Er Bi Yan Hou Ke Za Zhi. 1999 Jul;13(7):309-10.
By observing the effect of ear-canal pressure variation (ECPV) on tempanometry using a sweep-frequency probe tone, the roles of sweep-frequency tempanograms changes were studied.
Tympanograms using a sweep-frequence probe tone were measured for 60 ears of 30 subjects at ECPV by admittance (Y), susceptance (B), conductance (G) with GSI33 middle ear analyzer.
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 ear-canal; delta Y, delta G got lower with higher positive and lower negative pressure at resonance frequency; delta B is about 0 mmhos and almost didn't change with ECPV; phase angle decreased with higher positive or lower negative pressure. delta Y, delta G and delta phi were the highest at the peak pressure.
The higher the ear-canal positive pressure or the lower the negative pressure is, the higher the compliance and the lower the mass of middle ear is comparatively. The rub of middle ear is the lowest at normal peak pressure.
通过观察耳道压力变化(ECPV)对使用扫频探测音的鼓室导抗测量的影响,研究扫频鼓室导抗图变化的作用。
使用GSI33中耳分析仪,在30名受试者的60只耳朵上,通过声导纳(Y)、声纳导纳(B)、声导(G)测量在耳道压力变化时使用扫频探测音的鼓室导抗图。
三种测量条件下的相位角和共振频率无明显差异(P>0.05);耳道内正压越高,共振频率越高,负压越低,共振频率越低;在共振频率下,随着正压升高和负压降低,ΔY、ΔG降低;ΔB约为0毫姆欧,几乎不随耳道压力变化而改变;正压升高或负压降低时,相位角减小。在峰值压力时,ΔY、ΔG和Δφ最高。
耳道正压越高或负压越低,中耳的顺应性相对越高,质量相对越低。在正常峰值压力时,中耳的摩擦最低。