II. Indications
III. Background
- Measures Tympanic Membrane and ossicle stiffness
- Techniques
- Pneumatic Otoscopy
- Visualize Tympanic Membrane move to insufflation
- Tympanogram
- Recorded as pressure-versus-compliance curve
- Pneumatic Otoscopy
IV. Curve Types
- Type A Curve: Pressue near 0 with normal curve width
- Type Ad curve: High peak height (high compliance)
- Tympanic Membrane thinning (healed post-rupture)
- Ossicular disarticulation (increased pressure also)
- Type As curve: low peak height (low compliance)
- Middle ear effusion
- Ossicular fixation decreasing TM mobility
- Type Ad curve: High peak height (high compliance)
- Type B Curve: Flat curve (low compliance)
- See decreased compliance below (based on volume)
- Normal volume (e.g. middle ear effusion, sclerosis)
- Low volume (e.g. Cerumen Impaction)
- High volume (e.g. TM Perforation or tube)
- Type C Curve (high negative pressure): Retracted TM
V. Findings: Compliance (measured along y or vertical axis)
- Normal compliance: 0.2 to 2.0 ml
- Reflects Tympanic Membrane mobility
- Measure air volume displaced by drum movement
- Increased compliance: flaccid Tympanic Membrane (Ad)
- Tympanic Membrane thinning (healed post-rupture)
- Ossicular disarticulation (increased pressure also)
- Decreased compliance (flat curves)
- Normal canal volume
- Flat curve (Type B)
- Middle ear effusion
- Scarred Tympanic Membrane (Tympanosclerosis)
- Cholesteatoma
- Middle Ear Tumor
- Convex peak with low compliance, normal volume (As)
- Middle ear effusion
- Ossicular fixation decreasing TM mobility
- Flat curve (Type B)
- Low canal volume, completely flat (Type B)
- Cerumen Impaction or ear debris present
- Incorrect probe placement
- High canal volume, flat curve (Type B)
- Tympanic Membrane Perforation (flat curve)
- Patent Tympanostomy Tube
- Prior mastoidectomy
- Normal canal volume
VI. Findings: Pressure (measured along X or horizontal axis)
- Normal Pressure: +100 mmH2O to -150 mmH2O
- Negative Pressure (under -150 mmH2O)
- Increased Pressure (over 100 mmH2O)
- Ossicular disarticulation (increased compliance also)
- Some cases of Acute Otitis Media
VII. References
Images: Related links to external sites (from Bing)
Related Studies
| Definition (NCI) | The study of the mobility of the tympanic membrane and conduction bones through air pressure changes. It is used to detect middle ear abnormalities. |
| Concepts | Diagnostic Procedure (T060) |
| MSH | D000158 |
| SnomedCT | 91573000 |
| CPT | 92567 |
| Japanese | 鼓膜聴力検査, ｺﾏｸﾁｮｳﾘｮｸｹﾝｻ |
| Czech | tympanometrie, Tympanometrie |
| Portuguese | Timpanometria |
| Spanish | Timpanometría, Timpanometria (prueba de impedancia), prueba de timpanometría, timpanometría (procedimiento), timpanometría |
| German | Tympanometrie |
| English | tympanometry, tympanometry (procedure), Tympanometry (impedance testing), Test;tympanometry, Tympanometry Test, Tympanometry testing (procedure), Tympanometry testing, Tympanometry testing, NOS, Tympanometry, NOS, Tympanometry, TYMPANOMETRY, tympanometry test |
| French | Tympanométrie |
| Italian | Timpanometria |
| Hungarian | Tympanometria |
| Norwegian | Tympanometri |
| Dutch | tympanometrie, Tympanometrie |
Ontology: Acoustic reflectometry (C0457462)
| Concepts | Diagnostic Procedure (T060) |
| SnomedCT | 278320003 |
| English | Acoustic reflectometry, Acoustic reflectometry (procedure) |
| Spanish | reflectometría acústica (procedimiento), reflectometría acústica |
Ontology: tympanogram (C0679573)
| Concepts | Diagnostic Procedure (T060) |
| English | tympanogram, tympanograms, Tympanogram |
