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Operation Manual easyTymp

8111254 Rev. 9

17/01/2018

1.6 Description

1.6.1 General

Dependent on the configuration the easyTymp offers the following Impedance measurements:

 Tympanometry

 Acoustic Reflex

 Contralateral Acoustic Reflex

 Acoustic Reflex Decay

 Eustachian Tube Function Test

Further information on the different tests are given in sections 1.6.2 to 1.6.6.

1.6.2 Tympanometry

Tympanometry is the objective measurement of middle ear mobility (compliance

) and

pressure

within the middle ear system (Figure 1). During the test, a low-pitched probe

tone (226 Hz) is presented to the ear canal by means of the hand-held probe. This tone

is used to measure the change in compliance in the middle ear system while the air

pressure is varied automatically from a positive value (i.e. +200 daPa) to a negative value

(i.e. -400 daPa max).

Figure 1

Maximum compliance of the middle ear system occurs, when the pressure in the middle

ear cavity is equal to the pressure in the external auditory canal. This is the highest peak

of the curve as it is recorded on the chart. The position of the peak on the horizontal axis

and on the vertical axis of the chart will provide diagnostic information regarding the

function of the middle ear system. Gradient calculations are reported as the

Tympanogram width at half of peak compliance expressed in daPa. A normative box is

available on both the display and printout to aid in diagnosis.

NOTE: 1.02 mmH

O = 1.0 daPa.

Compliance is measured with respect to an equivalent volume of air, with the scientific quantity milliliter (ml).

Air pressure is measured in deca-Pascals (daPa).

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