A 70-year-old male with bilateral moderate-to-severe SNHL (PTA 65 dB bilaterally) and word recognition score of 68% bilaterally is fitted with behind-the-ear (BTE) hearing aids. He reports benefit in quiet but difficulty in noisy environments. The signal processing feature most likely to improve speech understanding in noise is:
- A Frequency compression (nonlinear frequency transposition)
- B CROS hearing aid fitting
- C Extended bandwidth amplification above 8 kHz
- D Directional microphone with beam-forming technology ✓
Explanation
Directional microphone technology in modern hearing aids preferentially amplifies sounds from the front (where speech typically originates in conversation) while attenuating sounds from behind and sides (where noise commonly originates). Advanced beam-forming uses multiple microphones to create a narrower directional pattern, significantly improving signal-to-noise ratio in noisy environments. CROS is for single-sided deafness. Frequency compression helps for severe high-frequency loss where amplification alone is insufficient. Extended bandwidth adds minimal benefit for speech in noise in an elderly sensorineural loss.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
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Written and medically reviewed by the StethoPrep medical team.