Management of ear-canal collapse

Area of Science:

• Audiology
• Hearing Science
• Otology

Background:

• Ear-canal collapse can significantly attenuate sound transmission, impacting hearing thresholds.
• Various acoustic interventions aim to mitigate this attenuation for improved audiological assessments.

Purpose of the Study:

• To evaluate the effectiveness of different acoustic interventions in compensating for ear-canal collapse during hearing threshold measurements.
• To compare the performance of ear-canal inserts, postauricular pads, and circumaural cushions in listeners with ear-canal collapse.

Main Methods:

• Hearing thresholds were measured across a wide frequency range (250–8,000 Hz).
• Participants included individuals with normal hearing and those with varying degrees of ear-canal collapse.
• Three types of acoustic interventions were tested: ear-canal inserts, postauricular pads, and circumaural cushions (Telephonics 510-020) with TDH-49 earphones.

Main Results:

• Circumaural cushions yielded the lowest hearing thresholds for listeners experiencing ear-canal collapse.
• Ear-canal inserts showed comparable results to circumaural cushions for mild to moderate collapse but were unsuitable for severe cases.
• Postauricular pads resulted in higher thresholds compared to circumaural cushions for most participants.

Conclusions:

• Circumaural cushions are the most effective intervention for mitigating sound attenuation due to ear-canal collapse.
• The choice of intervention should consider the severity of ear-canal collapse to ensure accurate hearing threshold measurements.
• Further research may explore optimized designs for ear-canal inserts to improve their efficacy in cases of severe collapse.