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Journal of Otology & RhinologyISSN: 2324-8785

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Research Article, J Otol Rhinol Vol: 3 Issue: 6

Long Ringing Cochlear Microphonics - Not Unique to Auditory Neuropathy Spectrum Disorder in Children

Prashanth Prabhu P*, Vijaya Kumar Narne and Animesh Barman
Department of Audiology, All India Institute of Speech and Hearing,Manasagangotri, Mysore, India
*Corresponding author : Prashanth Prabhu P
Department of Audiology, All India Institute of Speech and Hearing, Manasagangothri, Naimisham Campus, Mysore, Karnataka - 570006, India
Tel: (+91) 8904353390
E-mail: [email protected]
Received: April 15, 2014 Accepted: September 23, 2014 Published: December 05, 2014
Citation: Prabhu PP, Narne VK, Barman A (2014) Long Ringing Cochlear Microphonics - Not Unique to Auditory Neuropathy Spectrum Disorder in Children. J Otol Rhinol 3:6. doi:10.4172/2324-8785.1000196

Abstract

Long Ringing Cochlear Microphonics - Not Unique to Auditory Neuropathy Spectrum Disorder in Children

Background: The detection of cochlear microphonics in surface recordings has been considered a distinctive sign of outer hair cell integrity in participants with auditory neuropathy spectrum disorder. The study highlights that this notion could result in misdiagnosis of patients.

Methods: The study reports three children with sloping hearing loss who were misdiagnosed as auditory neuropathy spectrum disorder based on absence of auditory brainstem response and presence of long ringing cochlear microphonics. The study also reports of three children with abnormal cochlear microphonics who have neurological abnormalities.

Results: The abnormal cochlear microphonics (long ringing) with absent auditory brainstem response was noted in sloping hearing loss participants. In addition, abnormal cochlear microphonics was also observed along with auditory brainstem response in children with neurological abnormalities.

Conclusion: Our results show that abnormal CM detection in surface recording is not a distinctive feature of auditory neuropathy spectrum disorder and participants who are diagnosed with auditory neuropathy spectrum disorder based on traditional diagnostic criteria should be reviewed to rule out possible misdiagnosis.

Keywords: Cochlear microphonics; Neurological abnormalities; Tone burst ABR; Polarity reversal

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