Otology Flashcards
7 symptoms of otology
- Hearing loss
- Tinnitus
- Vertigo
- Facial weekness
- Otalgia
- Otorrhoea
Investigations
Examination: otoscopy and microscopy Rinne's Webber's Whispered voice test Audiogram Tympanogram
Rinne’s
One in front and behind the ear.
When air> bone then normal hearing
Bone> air then conductive hearing loss
Webber’s
In centre of forehead
If right hearing > left hearing: conductive hearing loss to the right ear
If left> right hearing: sensory hearing loss to right ear
Tympanometry
-Measures the mobility of the eardrum
-Air is pushed into the eardrum to see how much movement is involved
-Can detect the presence of fluid in the middle ear, ear wax in the ear canal or perforation of the eardrum
N.B. eardrum is the same as the tympanic membrane
Audiometry
Pure tone
Detects the faintest tones a person can hear a different frequencies from low to high
Visual Reinforcement
6 months- 3 years
Child is given a reward when they get the right answer
Play
3-6 years
Otoacoustic hearing test
-For babies between 0-6 months
-Used to detect damage to the external ear, presence of fluid in the middle ear
-Objective test
Emissions let off when the Cochlea is stimulated by vibrations of sound .
Outer hairs vibrate which produces a vibration which is nearly inaudible which echoes in the middle ear- it can be detected by a probe inserted in to the ear canal
People with a hearing of 25-30dB cannot hear these sounds
Auditory brainstem response
-Test to measure the function of the inner ear and brain pathways for hearing
-Used in patients who have difficulty with conventional testing
-Electrodes are placed on the head and waves of activity are detected when the person hears sound
The person is usually doing little or sleeping
When used as a screening test for babies only one sound is used. The baby either passes or fails the test
