Test-Retest Differences in the Wideband Middle Ear Muscle Reflex

Area of Science:

• Audiology
• Neuroscience
• Otoacoustic Emissions

Background:

• Middle ear muscle reflex (MEMR) assessment is crucial for evaluating middle ear function and identifying retrocochlear lesions.
• Wideband MEMR offers more detailed frequency information and lower thresholds than traditional tonal probes.
• Emerging research suggests wideband MEMR may detect noise-induced cochlear synaptopathy, but its clinical use for cochlear deafferentation requires further validation.

Purpose of the Study:

• To determine the test-retest reliability of wideband middle ear muscle reflex (MEMR) measurements.
• To establish a baseline for clinical interpretation of wideband MEMR in assessing cochlear deafferentation.
• To evaluate the impact of stimulus level on MEMR test-retest variability.

Main Methods:

• 45 adults with normal hearing and tympanograms participated.
• Wideband MEMR magnitude and threshold were measured twice, with 2 hours to 5 months between sessions.
• Contralateral broadband noise stimuli were used at elicitor levels from 60 to 100 dB SPL.

Main Results:

• Test-retest differences in MEMR magnitude and threshold increased with higher elicitor levels.
• Individual variations in MEMR magnitude and frequency response were observed between test sessions.
• These findings highlight the need for careful interpretation of wideband MEMR results.

Conclusions:

• Test-retest differences in contralateral wideband MEMR magnitude and threshold are influenced by elicitor level.
• Clinicians can use these established differences to aid in the interpretation of wideband MEMR results.
• Further research is needed to fully integrate wideband MEMR into diagnostic protocols for cochlear deafferentation.