Transcript Lab Report 32 - Cloudfront.net

Please Pick Up A
Notebook Check
DUE FRIDAY
Lab Report 32
Ear and Hearing
• Finish Part A on your own
Part B: Hearing Tests
• Rinne Test
• Weber Test
Rinne Test
Objective: This test is done to assess possible
conduction deafness by comparing bone and air
conduction.
•
•
Obtain a tuning fork and strike it with a rubber hammer, causing it to
vibrate
Place the end of the fork’s handle against your partner’s mastoid
process behind their ear. Have the prongs of the fork pointed
downward and away from the ear (make sure nothing is touching them).
•
•
•
Ask your partner to indicate when the sound is no longer heard
Then QUICKLY, remove the fork from the mastoid process and position
it in the air close to the opening of the nearby external acoustic meatus
(ear canal).
•
•
The sound sensation is that of BONE CONDUCTION.
The sound sensation is that of AIR CONDUCTION
RECORD RESULTS (normal or impaired)
Student Demo
RINNE
normal
impaired
Weber Test
Objective: This test is used to distinguish possible
conduction or sensory deafness.
•
•
•
•
Strike the tuning fork with the rubber hammer
Place the HANDLE of the fork against the midline (middle) of your
partner’s forehead
Ask your partner to indicate if the sound is louder in one ear than in the
other ear OR if it is equally loud in both ears
RECORD results
Student Demo
WEBER
Louder
quieter
Weber Test Extension
•
•
Have your partner experience the effects of conductive impairment
by packing one ear with cotton and repeating the Weber test.
Usually sound appears louder in the plugged (or impaired) ear
because extraneous sound from the room are blocked out
TEST RESULTS
Rinne Test Results
If hearing is normal, the sound from AIR CONDUCTION will
be heard again.
Normal: Sound is heard through bone AND air conduction
(+ Rinne
Test)
Conductive impairment: Sound is not heard after tuning fork is
removed from the mastoid bone- only heard through bone because this sound
bypasses the auricle, external acoustic meatus, and middle ear ( -Rinne Test)
•
If no sensation is experienced, there is conductive impairment . Conductive
impairment involves outer or middle ear defects. Hearing aids can improve
hearing for conductive deafness because bone conduction transmits the
sound into the inner ear. Surgery could possible correct this type of defect
Sensorineural impairment: Can hear the sound through air and
bone conduction but sound is diminished. Probably heard longer and louder
when on the mastoid process (+ Rinne Test )
Weber Test Results
If hearing is normal, the sound should be heard equally in
both ears
Conductive impairment: Sound will be LOUDER in
AFFECTED ear. Conduction problems mask the noise in the room while the
bone picks up sound via the skull
Sensorineural impairment: If some degree of sensory
(nerve) deafness exists, sound will be LOUDER in NORMAL ear. This is
because the bone is less effective at picking up sound even if it is transmitted
directly into the inner ear.
•
•
•
If you heard the sound in the Rinne test when the tuning fork was by
your ear, you probably have this type of impairment
The impairment involved the organ of Corti or the cochlear nerve. Hearing
aids WILL NOT improve sensory deafness
Could be caused by loud noises (such as music) with no ear protection
(Think Roger from our Hearing Case Study: No More Loud Music)
Conductive
Hearing Loss
Sensorineural
Hearing Loss