Multifrequent Tympanometry Essay

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MULTIFREQUENCY- MULTICOMPONENT TYMAPNOMETRY IN NORMAL HEARING ADULTS

Abstract

Multifrequency tympanometry refers to testing middle ear function at higher frequency(678,1000Hz) where as Multicomponent refers to measuring middle ear function for various components(Y,B,G). middle ear function varies with frequency and is capable of distinguishing subtle acoustical changes in the middle ear system hence the main application of MFT is in cases with low impedance pathologies such as ossicular chain discontinuity, hypermobile Tympanic membrane etc. The conventional tympanometry fails to differentiate the presence of mass dominated pathology. Current study aimed to develop Indian norms within the age range of 18 to 65 years. 267 males and 243 females were taken as subject. Calibrated GSI tympstar impedance audiometer was used to measure Y, B, G components at 226 678, 1KHz . Results of study …show more content…
Figure 2 demonstrates the variation of positively compensated admittance (Ytm), susceptance (Btm), and conductance (Gtm) as a function of probe tone frequency. While acoustic resistance is independent of frequency, acoustic conductance does vary with frequency. The variation of Ga with frequency can be understood as a variation of Ra and Xa with frequency. Stiffness and mass susceptance are frequency dependent. Mass susceptance is directly proportional to frequency and stiffness susceptance is inversely proportional to frequency. Tympanometry is a safe and quick method for assessing middle ear function. Currently, tympanometry is typically conducted at a conventional probe tone frequency of 226-Hz. Tympanometry performed using this frequency has proven valid in identifying a variety of middle ear disorders (Lilly,

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