brainstem auditory evoked response


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Related to brainstem auditory evoked response: Brainstem auditory evoked potentials

au·di·to·ry brain·stem re·sponse (ABR),

an electrophysiologic measure of auditory function using computer-averaged responses produced by the auditory nerve and the central auditory pathways principally in the brainstem to repetitive acoustic stimuli. ABR is also used to locate brainstem lesions and determine whether a hearing impairment is sensory or neural.

brainstem auditory evoked response (BAER)

the electric activity that may be recorded from the brainstem in the first 10 msec after presentation of an auditory stimulus. In a subject with normal brainstem functioning, seven peaks are observed. A delayed, normally shaped waveform may indicate a hearing loss caused by a middle or inner ear disorder; one or more missing peaks may indicate a neural disorder.

brainstem auditory evoked response

A method for evaluating hearing using clicking sounds and recording the responses (known as auditory evoked potentials) with EEG electrodes placed on the scalp; BAER is an objective means of diagnosing and localising early lesions of the auditory system.
 
Indications
BAER is used to diagnose acoustic neuroma, instrinsic brainstem lesions (e.g., multiple sclerosis, infarction, gliomas), degenerative disease (e.g., Charcot-Marie-Tooth disease, Meniere’s disease, olivopontocerebellar degeneration, stroke, Wilson’s disease), increased intracranial pressure and brain death.

brainstem auditory evoked response

BAER, Brainstem auditory evoked potential Neurophysiology A method for evaluating hearing using clicking sounds and recording the responses–known as auditory evoked potentials with EEG electrodes placed on the scalp; the early responses reflect electrical activity at the cochlea, cranial nerve VIII and brainstem; late responses are due to cortical activity; after each click, 7 consecutive potentials are recorded, designated as waves I through VII, each of which corresponds to a specific relay point in the brainstem; BAER is an objective means of diagnosing and localizing early lesions of the auditory system Indications BAER is used to diagnose acoustic neuroma, intrinsic brainstem lesions–eg, multiple sclerosis, infarction, gliomas, degenerative disease–eg, Charcot-Marie-Tooth disease, Meniere's disease, olivopontocerebellar degeneration, stroke, Wilson's disease, ↑ intracranial pressure, brain death

au·di·to·ry brain·stem re·sponse

(ABR) (aw'di-tōr-ē brān'stem rĕ-spons')
A response produced by the auditory nerve and the brainstem to repetitive acoustic stimuli.
Synonym(s): brainstem evoked response.

brainstem

the stemlike portion of the brain connecting the cerebral hemispheres with the spinal cord, and comprising the pons, medulla oblongata and midbrain; considered by some to include the diencephalon. See also reticular activating system, ascending reticular formation, thalamus.

brainstem auditory evoked response
see brainstem auditory evoked response.
brainstem hemorrhage
results from cranial trauma and characteristically causes unconsciousness with varying types and degrees of motor paralysis and irregularities of respiration, depending on the site.
brainstem reticular formation
see reticular activating system.