• Tympanometry directly measures the compliance
of the tympanic membrane and ossicular chain, estimating middle
• Tympanometry is primarily used to detect the presence of middle
ear fluid, enhancing the diagnosis of acute otitis media and otitis
media with effusion.
• The procedure is also useful for detecting tympanic membrane
perforation, ossicular chain disruption, and the patency of eustachian
• Tympanometry is commonly performed as part of the early evaluation
of hearing loss.
• Age younger than 7 months. Studies have shown
that tympanometry in infants 0–7 months of age is inaccurate
due to the high compliance of the ear canal in these patients.
• Recent ear surgery, such as stapedectomy, myringoplasty, or tympanoplasty.
• Before beginning the procedure, make sure that
the probe assembly is securely fastened together; leaks will obscure the
• Also, ensure that the probe tube and tips are dry; wet equipment
may clog, making it impossible to continue the test.
• Describe the procedure to the parents and patient
and answer any questions.
• Be sure to inform the patient that he or she will be hearing some
brief, but potentially loud, sounds.
• Hearing results from the conduction of sound
into the ear canal. Sound stimulates the tympanic membrane, which then
• The malleus (the first bone of the ossicular chain, attached
to the eardrum) also starts vibrating, which sets the incus and
stapes into motion (Figure 44–1).
• The stapes is set in the oval window, the opening
of the inner ear. The sound is conducted into the inner ear, which translates
sound energy into nerve impulses to the brain.
• The eustachian tube, an extension of the nasopharynx, equalizes
middle ear pressure with atmospheric pressure (the pressure within
the ear canal).
• Using an otoscope, examine the ear canal and
remove any occluding cerumen.
• Choose the appropriate sized ear tip for the patient’s
ear canal and affix it to the probe.
• Grasp the helix and pull back and up gently to straighten the
• Insert the probe into the entrance of the ear canal, obtaining
an airtight ...
Log In to View More
If you don't have a subscription, please view our individual subscription options below to find out how you can gain access to this content.
Want remote access to your institution's subscription?
Sign in to your MyAccess profile while you are actively authenticated on this site via your institution (you will be able to verify this by looking at the top right corner of the screen - if you see your institution's name, you are authenticated). Once logged in to your MyAccess profile, you will be able to access your institution's subscription for 90 days from any location. You must be logged in while authenticated at least once every 90 days to maintain this remote access.
If your institution subscribes to this resource, and you don't have a MyAccess profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus.
AccessPediatrics Full Site: One-Year Subscription
Connect to the full suite of AccessPediatrics content and resources including 20+ textbooks such as Rudolph’s Pediatrics and The Pediatric Practice series, high-quality procedural videos, images, and animations, interactive board review, an integrated pediatric drug database, and more.
Pay Per View: Timed Access to all of AccessPediatrics
24 Hour Subscription $34.95
48 Hour Subscription $54.95
Pop-up div Successfully Displayed
This div only appears when the trigger link is hovered over.
Otherwise it is hidden from view.