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Related Experiment Videos

Primary auditory neuropathy - an enigma.

N Shivashankar1, P Satishchandra, H R Shashikala

  • 1Department of Speech Pathology and Audiology, National Institute of Mental Health and Neuro Sciences, Bangalore, India. shiv@nimhans.kar.nic.in

Acta Neurologica Scandinavica
|July 16, 2003
PubMed
Summary
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Primary auditory neuropathy (PAN) presents with normal neurological findings and specific audiological signs like present otoacoustic emissions and absent auditory brainstem responses. Patients with PAN show good syllable recognition but struggle with complex auditory tasks.

Area of Science:

  • Audiology
  • Neuroscience
  • Otolaryngology

Background:

  • Auditory neuropathy spectrum disorder (ANSD) is a complex hearing impairment.
  • Primary Auditory Neuropathy (PAN) is a specific subtype requiring clear definition.

Purpose of the Study:

  • To characterize audiological and neuroradiological findings in patients with PAN.
  • To propose PAN as a distinct clinical entity.

Main Methods:

  • Analysis of auditory profiles in 24 patients.
  • Inclusion of neurological and radiological assessments.
  • Utilized puretone audiometry, syllable recognition, dichotic digit test, auditory brainstem responses, and otoacoustic emissions.

Main Results:

  • Varied hearing acuity with preserved syllable recognition (>80% in most).

Related Experiment Videos

  • Absent auditory brainstem responses and acoustic stapedius reflexes.
  • Present distortion product otoacoustic emissions (DPOAE) in all patients.
  • Normal neurological and radiological findings.

    • Conclusions:

    • Audiological profile consistent with DPOAE presence and absence of auditory brainstem responses/acoustic stapedius reflexes.
    • Significant performance deficits in dichotic digit testing despite preserved quiet listening.
    • Proposed PAN as a term for this entity due to lack of neurological deficits and etiological factors.