Screening tympanometry: criteria for medical referral

Area of Science:

• Audiology
• Biomedical Engineering

Background:

• Tympanometry is crucial for assessing middle ear function.
• Existing screening methods can have high error rates, necessitating improved protocols.

Purpose of the Study:

• To establish normative tympanometric values in preschool and adult populations.
• To evaluate the influence of age, sex, and pump speed on tympanometric variables.
• To develop an improved hearing screening protocol.

Main Methods:

• A prototype hand-held tympanometer was used to collect data.
• Four tympanometric variables were measured: static admittance, equivalent ear canal volume, tympanometric peak pressure, and gradient.
• Data were analyzed for effects of age group, sex, and pump speed (200 or 400 daPa/s).

Main Results:

• Normative values for static admittance, equivalent ear canal volume, tympanometric peak pressure, and gradient were determined.
• Age group, sex, and pump speed showed specific effects on the measured variables.
• The results informed a multi-component screening protocol.

Conclusions:

• The established normative data enhance the reliability of tympanometry.
• A four-part screening protocol (history, visual inspection, audiometry, tympanometry) reduces errors compared to tympanometry alone.
• This approach offers a more accurate method for hearing screening in children and adults.