What is multifrequency tympanometry?

What is multifrequency tympanometry?

Multi-frequency tympanometry is based on the analysis of tympanograms at a wide range of frequencies between 226 and 2,000 Hz. The acoustic immittance is a term that encompasses impedance, admittance, and their components. The RF is described as the frequency at which both stiffness and Bm are equal.

What is High frequency tympanometry?

Tympanogram indicates how the immittance of the ear is altered when the ear canal pressure varies. Using high-frequency probe tones is suggested for evaluating a middle ear system that is mass-dominated as in the case of young infants [12,13].

What is measured in tympanometry?

Tympanometry measures ear canal volume (ECV), tympanic membrane mobility (compliance), and middle ear pressure (pressure). The ability to measure tympanic membrane mobility and middle ear pressure is useful in the assessment of middle ear condition and functioning, which can contribute to conductive hearing loss.

What is wide band tympanometry?

The wideband tympanometry (WBT) assesses the middle ear function with a transient wideband stimulus in order to capture the middle ear behavior at a wide range of frequencies. Data in the literature suggest that the WBT has more sensibility to detect middle ear disorders than the traditional tympanometry.

What is multicomponent tympanometry?

Multicomponent tympanograms were considered abnormal if the number of peaks (maximas & minimas) were more than 5 for susceptance (B) tympanograms and more than 3 for conductance (G) tympanogram; the pressure difference between the outermost maximas was more than 100 daPa for a 5 B tympanogram and more than 75 daPa for …

Why middle ear is stiffness dominated?

For different probe tone frequencies (or frequency components of the click stimuli used in WBT) the middle ear will be either spring dominated (sometimes called stiffness dominated) or mass dominated. An increase in stiffness increases the resonant frequency whereas an increase in mass decreases the resonant frequency.

What is wide band reflectance?

Wideband power reflectance provides a broad spectrum measure of the impedance mismatch between the ear canal and middle ear. The reflectance frequency response alters predictably with middle ear pathology, emphasizing that the reflectance curve is a measure of the filtering properties of the middle ear.

What is wideband acoustic Immittance?

Abstract. Background: Wideband acoustic immittance (WAI) measurements are a relatively new class of aural acoustic tests that have shown promise as useful tools for evaluating middle-ear status.

What is the normal probe tone frequency for tympanometry?

Methodologic observations on tympanometry with regard to the probe tone frequency. Acta Otolaryngologica, 80, 54–60. Colletti, V. (1976). Tympanometry from 200 to 2000 Hz probe tone. Audiology, 15, 106–119. Colletti, V. (1977).

Is tympanometry suitable for evaluation of middle ear function?

Middle ear function is usually evaluated with tympanometry using a probe tone of 226 Hz, although higher frequencies are recommended in infants. The aim of this study was to compare the feasibility of 226 and 1000 Hz tympanometry for different trace classification systems in relation to age, risk factors for hearing loss and ear canal volume.

Is 226 Hz tympanometry effective in the diagnosis of otitis media?

In the first 6 months of life, 226 Hz tympanometry is considered an ineffective procedure for the diagnosis of otitis media with effusion. With the introduction of universal hearing screening, the use of high frequency 1000 Hz (1 kHz) tympanometry has been recommended.

What is an abnormal tympanogram at 678 Hz?

If the ear is abnormally mass controlled at 678 Hz, then a mass pathology is suspected. In Figure 7, examples of two-component, two-frequency admittance tympanograms reflecting a mass-controlled system because of ossicular discontinuity (left panel), tympanosclerosis (middle panel), and secretory otitis media (right panel) are shown.