The Veteran With a 'Normal' Audiogram and a Big Complaint
A 58-year-old Army veteran complains of difficulty hearing in noisy restaurants and on the phone, and says people "mumble." He has tinnitus and reports blast exposure. Pure-tone audiometry shows thresholds of 15-20 dB HL from 250 to 4000 Hz bilaterally, with a notch at 6000 Hz to 30 dB HL and recovery at 8000 Hz. Word recognition in quiet is 92% right and 88% left at 40 dB HL. Acoustic reflexes are present at 85 dB HL bilaterally. Tympanometry is type A. He asks whether he qualifies for hearing aids and whether his hearing is "really normal."
1. How do you explain the discrepancy between his normal PTA and his functional complaints, and what tests would you add?
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His PTA is normal (≤20 dB HL through 4 kHz), but he has a noise-induced notch at 6000 Hz and complaints classic for hidden hearing loss / speech-in-noise difficulty - blast exposure damages high-threshold auditory nerve fibers and cochlear synapses that pure-tone thresholds do not capture. The 6000 Hz notch is a signature of noise exposure.
Add:
- Speech-in-noise testing (e.g., QuickSIN or HINT) - this is the test that will likely reveal his real deficit.
- Extended high-frequency audiometry (9-16 kHz) to document the notch and any progression.
- Otoacoustic emissions (may be reduced at high frequencies) and consideration of ABR wave I amplitude if available.
- Tinnitus evaluation and a hearing-in-noise questionnaire (e.g., SSQ, HHIE).
Explain that "normal" on a standard audiogram means normal for pure tones in quiet, not normal hearing in background noise. His complaint is real and measurable with the right tests.
2. Does he qualify for hearing aids? Justify your answer using the data and the concept of auditory fitness for duty.
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Clinically, yes - he is a strong candidate for hearing aids or, at minimum, remote-microphone/assistive technology, even though his PTA is normal. Justification:
- Functional handicap: significant speech-in-noise difficulty and tinnitus affecting communication and quality of life.
- High-frequency notch at 6000 Hz indicates noise damage; speech consonants (s, f, th) carry energy at 4-8 kHz, so even a narrow notch can degrade clarity.
- Speech recognition in noise (to be measured) is the deciding data point; if QuickSIN SNR loss is elevated, amplification with frequency-lowering or directional/remote-microphone features is appropriate.
However, insurance/VA criteria often require a threshold-based loss (e.g., PTA >25 dB or specific configuration). He may not meet a strict numerical criterion, so document the functional deficit and appeal if needed. Auditory fitness for duty (if he works in a safety-sensitive job) uses different standards and may disqualify him despite a "normal" audiogram - clarify his employment status.
3. How would you counsel him about tinnitus and about the limits of the audiogram?
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Tinnitus: Explain that tinnitus is common after blast/noise exposure and is a symptom, not a disease. Offer sound therapy, masking, and cognitive behavioral therapy; screen for depression and sleep disruption. Avoid promising a cure.
Audiogram limits: Explain that the audiogram measures soft-tone detection in a quiet booth, but hearing is also about understanding speech in noise, which depends on cochlear synapses and auditory nerve fibers not reflected in thresholds. His "normal" audiogram does not mean his hearing is fine for his needs. Validate his experience, provide the speech-in-noise results as evidence, and set expectations: hearing aids and remote microphones can improve clarity even when the PTA is normal. Document the counseling and schedule follow-up.