Activity 4: Conducting Laboratory Tests of Hearing

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1

Weber Test to Determine Conduction And Sensorineural Deafness

Strike a tuning fork and place the handle of the tuning fork medially on your partner's head. Is the tone equally loud in both ears, or is it louder in one ear?

  1. Explain the diagnosis if the sound is equally loud in both ears.
  2. Explain the diagnosis if the sound is heard in one ear only.
  3. Explain the diagnosis if the sound is is heard more strongly in one ear.

1.The subject has equal hearing or equal loss of hearing in both ears.

2. Sensorineural deafness is present. The subject hears the tone in the unaffected ear but not at all in the ear with sensorineural deafness.

3. Conduction deafness is present. The subject hears the sound more strongly in the ear in which there is a hearing loss because the bone of the skull is conducting the sound.

2

When does conduction deafness occur?

When something prevents sound waves from reaching the fluids of the internal ear.

3

What are 4 possible causes of conduction deafness?

1. Compacted earwax

2. Perforated eardrum

3. Inflammation of the middle ear (otis media)

4. Damage to the ossicles

4

Rinne Test for Comparing Bone-conduction and Air-conduction Hearing

  • Strike the tuning fork, and place its handle on your partner's mastoid process.
  • When your partner indicates that the sound is no longer audible, hold the still-vibrating prongs close to his/her external acoustic meatus.
  • If your partner hears the fork again (by air conduction), is hearing affected or not affected.

Hearing not affected.

5

Rinne Test for Comparing Bone-conduction and Air-conduction Hearing

  • Repeat the test, but this time test air-conduction hearing first.
  • Strike the tuning fork, and hold the still-vibrating prongs close to his/her external acoustic meatus.
  • After the sound is no longer heard by air conduction, hold the handle of the tuning fork on the mastoid process.
  • If the subject hears the tone again by bone conduction after hearing by air conduction is lost, what is the diagnosis?

There is some conduction deafness.