Auditory Brainstem Response
The auditory brainstem response (ABR) is an auditory evoked potential extracted from ongoing electrical activity in the brain and recorded via electrodes placed on the scalp. The resulting recording is a series of vertex positive waves of which I through V are evaluated. These waves, labeled with roman numerals in Jewett and Williston convention, occur in the first 10 milliseconds after onset of an auditory stimulus. The ABR is considered an exogenous response because it is dependent upon external factors
The auditory structures that generate the auditory brainstem response are believed to be as follows:
- Wave I – generated by the peripheral portion of cranial nerve VIII
- Wave II – generated by the central portion of cranial nerve VIII
- Wave III – generated by the cochlear nucleus
- Wave IV – generated by the superior olivary complex/lateral lemniscus
- Wave V – generated by the lateral lemniscus/inferior colliculus
Other articles related to "auditory brainstem response, auditory":
... Diagnosis is possible after a test battery, that must necessarily include the following the auditory brainstem response and otoacoustic emissions ... Auditory brainstem response should be tested with both polarities (helps in identifying Cochlear Microphonics) ... Auditory neuropathy is diagnosed when a person has present Otoacoustic Emissions and/or Cochlear Microphonics in combination with absent or abnormal Auditory Brainstem Response ...
... If patient is deeply sedated, the individual’s only job should be to verify and record vital signs no less than every five minutes ... All age and size appropriate equipment and medications used to sustain life should be verified before sedation and should be readily available at any time during and after sedation ...
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