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BAEPs

BAEP interpretation

QuestionAnswer
Absent bilaterally Bilateral acoustic nerve lesions; brain death; rule out technical problems
Low amplitude or increased latency of entire AEP bilaterally Peripheral hearing loss; acoustic nerve lesion; rule out reduced stimulus intensity
Absent unilaterally; other side normal Unilateral cochlear or acoustic nerve lesion
Absent peaks after a normal wave I, other side normal Unilateral proximal acoustic nerve or pontomedullary lesion
Increased latency of wave I and subsequent waves; interpeak latency III-V normal Peripheral hearing loss or acoustic nerve lesion
Absent wave V or decreased amplitude ratio V/I Ipsilateral lower or upper brainstem lesion
Increased interpeak latency I-III and III-V Ipsilateral lower and upper brainstem lesion
Increased Interpeak latency I-III, normal III-V Ipsilateral lower brainstem lesion, betwen acoustic nerve and lower pons
Increased interpeak latency III-V, normal I-III Ipsilateral upper brainstem lesion, between lower pons and midbrain
Abnormal increase of wave V latency with rapidly repeating stimulus Suspect ipsilateral brainstem lesion
Increased BAEP threshold Suspect peripheral hearing loss or distal acoustic nerve lesion
Shift of latency-intensity curve upward but parallel to normal curve conductive hearing loss
Shift of latency-intensity curve upward predominantly at low intensities Sensorineural hearing loss
Electrical problems leading to lack of all BAEP waves Lack of effective stimuli, abnormal timing between stimulator and recording apparatus, poor electrode connections, amplifier failure, data manipulation error
Pathological problems leading to lack of BAEP waves severe sensorineural hearing loss, severe conductive hearing loss, lesion of the distal acoustic nerve
Created by: schmittse