Impedance audiometry.pptx

Basic of tympanometry, eustachian function test and stapedial reflex.
types of tympanograms discussed.

1. Impedance Audiometry DR SAFIKA ZAMAN DEPT OF ENT RKMSP

2. Advantage Objective test Quick Possible in paediatric patients

3. Uses Differential diagnosis in cases of conductive deafness Evaluation of ET function Identification of site of lesions in facial paralysis

4. Impedance audiometry Tympanometry Stapedial test Eustachian tube function test

5. Impedance Impedance of the medium –Complex mixture of 3 parameters stiffness, mass , friction . Middle ear acts as the impedance matching device All middle ear pathologies alter this impedance , results in lesser sound energy being transmitted to the cochlear fluid.

6. Tympanometer

7. Probe 1. Sound aperture 2.Microphone 3.Manometer

8. Definition of Tympanometry Change in the impedance of the middle ear at the plane of the tympanic membrane as a result of changes in air pressure in the external auditory meatus. Source – Clinical Audio- Vestibulometry , Anirban Biswas

9. Tympanogram example

10. Normal Range Normal range of static compliance is – 0.35 to 1.40 ml Normal pressure is – 50 to +50 mm of water pressure

11. Positive and negative tail of tympanogram Source – Clinical Audio- Vestibulometry , Anirban Biswas

12. Source – Clinical Audio- Vestibulometry , Anirban Biswas

13. Source – Clinical Audio- Vestibulometry , Anirban Biswas

14. Jerger’s classification

15. Strain, George & Fernandes , Asia. (2015). Handheld tympanometer measurements in conscious dogs for the evaluation of the middle ear and auditory tube. Veterinary Dermatology. 26. 10.1111/vde.12195.

16. William`s Test ( Eustacchian tube function test)

17. Toynbee`s Test (Eustachian tube function test in perforated drum )

18. Acoustic Reflex Test