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Predicting children's real-ear-to-coupler differences based on tympanometric data.

Ryan W McCreery¹, Jeffery Crukley², Anastasia Grindle³

¹Audibility, Perception, and Cognition Laboratory, Boys Town National Research Hospital, Omaha, NE, USA.

International Journal of Audiology

|February 8, 2023

Summary

This summary is machine-generated.

Tympanometry can improve real-ear-to-coupler difference (RECD) predictions in children when direct RECD measurement is not possible. This method is particularly beneficial for children with abnormal middle ear status, enhancing hearing aid fitting accuracy.

Keywords:

Paediatric acoustics hearing loss hearing-aid real-ear-to-coupler difference verification

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Area of Science:

Audiology
Pediatric audiology
Hearing science

Background:

Paediatric hearing aid verification typically uses real-ear-to-coupler difference (RECD) measurements.
Direct RECD measurements are not always feasible in children, potentially leading to inaccurate hearing aid fittings.
Audiologists often possess tympanometry data that characterizes pediatric ear canal acoustics.

Purpose of the Study:

To evaluate if tympanometry can enhance the prediction accuracy of measured RECD in children.
To determine the clinical utility of tympanometry for improving RECD predictions when direct measurement is not possible.

Main Methods:

Retrospective analysis of RECD and tympanometry data (admittance, peak pressure, equivalent ear-canal volume at 226 Hz) from 266 children with mild-to-severe hearing loss.
Bayesian hierarchical regression modeling was employed to analyze the relationship between tympanometry and RECD.

Main Results:

Age-based average RECD models achieved 3 dB accuracy in 54% (normal middle ear) and 50.6% (abnormal middle ear) of cases.
Immittance-predicted RECD models showed higher accuracy, achieving 3 dB accuracy in 69.6% (normal middle ear) and 74.4% (abnormal middle ear) of cases.
Immittance-predicted RECD was significantly more accurate than age-based predictions, especially in children with abnormal middle ear conditions.

Conclusions:

Tympanometry offers a more accurate prediction of RECD compared to age-based averages, particularly for children with abnormal middle ear status.
The study suggests that 226 Hz tympanometry can be clinically utilized to improve RECD predictions when direct measurement is not feasible.
This approach can lead to more accurate hearing aid fittings for pediatric populations.