Operation of Tympanometry
At first, the otoscopy test is performed to check neither any foreign particles nor earwax are present in the ear canal as its presence may be obstructing your hearing power.
After this, a probe with flexible rubber tip is inserted in your ear which will cause changes in air pressure inside your ear canal when you start hearing some low-pitched noise up to 226 Hz. The movement of the eardrum is represented in the graph called tympanogram as the air pressure keeps changing. They are totally risk-free and suitable for child and adults.
After the test, if the tympanometry is normal there will be no fluid in the ear canal but if there is fluid near eardrums then the tympanometry is not normal. So in all tympanometry shows the normal movement of the middle ear canal, eardrums, and conduction bone.
Data Representing Normal & Abnormal Tympanometry :
- No fluid present in eardrums
- Normal movement of conduction bone and an eardrum
- The Tympanic membrane in good condition
- No need to conduct any additional test
- Presence of fluids in eardrums
- Lack of contact in conduction bone of the middle ear
- Scarring of tympanic membrane due to an ear infection
- Need to conduct some additional test
Classification of Tympanogram
After conducting the tympanometry test, the graphs obtained are classified into following types based on compliance and pressure.
Tympanogram Type A-
Type A shows a teepee and a normal middle ear system which has no fluid and an intact tympanic membrane. It also indicates not a presence of any kind of foreign particles that usually prevent the entrance of sound into the cochlea from the middle ear. It shows compliance with 0.3-1.5 ml.
Click next to know more about Tympanometry