What type of Tympanogram would you expect to see with otosclerosis?
If the ear canal volume is normal, the Type B tympanogram may be reflective of an advanced stage of otosclerosis or a middle ear filled with an effusion (possibly caused by an ear infection).
What does otosclerosis look like on an audiogram?
On an audiogram, patients with otosclerosis commonly have conductive hearing loss with a drop in the bone-conduction threshold at 2,000 Hz, called a Carhart notch. This finding, in addition to an absent acoustic reflex, is generally thought to be diagnostic of otosclerosis.
Can otosclerosis cause ossicular disarticulation?
One cause of this problem is a disease called otosclerosis. Also, trauma or infection can lead to problems with the middle ear bones, called ossicular chain discontinuity. Some children are born with malformed middle ear bones that don’t conduct sound properly.
What causes ossicular disarticulation?
Ossicular chain dislocation may be caused by: A fracture of one of the bones at the side or base of the skull (temporal bone) A hole in the eardrum that is caused by trauma (tympanic membrane perforation) Chronic otitis media.
Is it normal to have a tympanometry in otosclerosis?
Tympanometry is the measure of acoustic energy transmission. Tympanograms often are normal in patients with otosclerosis. Only in extensive cases of otosclerosis may the patient’s tympanogram demonstrate some flattening secondary to severe ossicular chain fixation. 18
What causes a flat tympanogram in the middle ear?
A fixation of the ossicular chain, as in otosclerosis, will produce a tympanogram with very low compliance in the presence of normal middle ear air pressure. Ear canal volume is normal and the reflex is absent. Middle ear fluid such as in serious otitis media will yield a very flat tympanogram with no definite peak and negative air pressure.
What does a low compliance reading on a tympanogram mean?
This is shown by having a normal tympanogram but with a low compliance/ SA reading. For example, a static admittance/ compliance of less than 0.3 cm3 is indicative of this type of tympanogram. This tympanogram is indicative of ossicular fixation, or some fluid in the middle ear causing restricted middle ear mobility.
Can a fixation of the ossicular chain cause low compliance?
Ear canal volume will be normal and the reflex will be absent. A fixation of the ossicular chain, as in otosclerosis, will produce a tympanogram with very low compliance in the presence of normal middle ear air pressure. Ear canal volume is normal and the reflex is absent.
