Brain-Stem Evoked Response Audiometry (BERA)

Brain-stem Evoked Response Audiometry (BERA)Bera is an objective way of eliciting brain stem potentials in response to audiological click stimuli. These waves are recorded by electrodes placed over the scalp. Even though BERA provides information regardi

How is the BERA test conducted?

Bera is an objective way of eliciting brain stem potentials in response to audiological click stimuli. These waves are recorded by electrodes placed over the scalp.  Even though BERA provides information regarding auditory function and sensitivity, it is not a substitute for other methods of audiological evaluation. It should be always viewed in conjunction with other audiological investigations.

How is the BERA test conducted?

The stimulus either in the form of click or tone pip is transmitted to the ear via a transducer placed in the insert ear phone or head phone. The wave forms of impulses generated at the level of brain stem are recorded by the placement of electrodes over the scalp.

What are the uses of BERA?

  • BERA is an effective screening tool for evaluating cases of deafness due to retrocochlear pathology i.e. (Acoustic schwannoma). An abnormal BERA is an indication for MRI scan.
  • Used in screening newborns for deafness
  • Used for intra-operative monitoring of central and peripheral nervous system
  • Monitoring patients in intensive care units
  • Diagnosing suspected demyelinated disorders

What are the criteria for screening newborn babies using BERA?

  • Parental concern about hearing levels in their child
  • Family history of hearing loss
  • Pre and post natal infections
  • Low birth weight babies
  • Hyperbilirubinemia
  • Cranio facial deformities
  • Head injury
  • Persistent otitis media
  • Exposure to ototoxic drugs
 

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