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Real ear measurement methods for open fit hearing aids: modified pressure concurrent equalization (MPCE) versus
Hashir Aazh1, Brian C J Moore, Deepak Prasher
1Audiology Department, Royal Surrey County Hospital NHS Foundation Trust, Guildford, UK. hashir.aazh@nhs.net
International Journal of Audiology
|October 26, 2011
Summary
The modified pressure stored equalization (MPSE) and modified pressure concurrent equalization (MPCE) methods show no significant differences in real ear insertion gains (REIG) for open fittings. These findings apply to patients with mild-to-moderate hearing loss.
Area of Science:
- Audiology
- Hearing Aid Technology
Background:
- Real ear insertion gain (REIG) measurement is crucial for hearing aid fitting.
- Open fittings are common for mild-to-moderate hearing losses.
- Comparing different measurement methods ensures accurate fitting.
Purpose of the Study:
- To compare REIG measurements between modified pressure concurrent equalization (MPCE) and modified pressure stored equalization (MPSE) methods.
- To assess these differences in open hearing aid fittings.
- To evaluate the clinical significance of any observed discrepancies.
Main Methods:
- REIGs were measured using both MPCE and MPSE methods.
- A warble tone sweep at 65 dB SPL was used for comparison.
- Measurements were taken at multiple frequencies (0.25–6 kHz) in 83 ears from 48 participants.
Main Results:
- The mean difference in REIG between MPSE and MPCE was under 1 dB across all tested frequencies.
- Statistical analysis revealed no significant main effect of the measurement method.
- No significant interaction was found between the measurement method and frequency.
Conclusions:
- MPSE and MPCE methods yield comparable REIG results for open fittings in patients with mild-to-moderate hearing loss.
- The tested REIG values were generally below 20 dB.
- Further research is needed to determine the clinical significance of differences at higher REIG values.
