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Brain-stem auditory evoked potentials and brain death.

C Machado1, P Valdés, J García-Tigera

  • 1Institute of Neurology and Neurosurgery, Department of Clinical Neurophysiology, Habana, Cuba.

Electroencephalography and Clinical Neurophysiology
|September 1, 1991
PubMed
Summary
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Brainstem auditory evoked potential (BAEP) studies in brain-dead patients reveal wave I abnormalities, often delayed or absent. These findings suggest BAEPs alone may not be sufficient for diagnosing brain death.

Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Brainstem auditory evoked potentials (BAEPs) are used to assess brainstem function.
  • Diagnosing brain death (BD) requires objective electrophysiological confirmation.

Purpose of the Study:

  • To analyze BAEP patterns in brain-dead patients.
  • To evaluate the utility of BAEPs in diagnosing brain death.

Main Methods:

  • Obtained BAEP records from 30 brain-dead patients.
  • Observed and categorized BAEP patterns, focusing on wave I latency and amplitude.

Main Results:

  • 73.34% of patients showed no identifiable BAEP waves.
  • 16.66% had isolated bilateral wave I, and 10% had isolated unilateral wave I, all significantly delayed.

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  • Progressive wave I latency increase and amplitude fluctuations were noted in serial recordings.

    • Conclusions:

    • Hypoxic-ischaemic dysfunction and hypothermia may explain wave I changes in brain death.
    • The timing of BAEP testing relative to clinical onset influences wave I preservation.
    • BAEPs alone may lack diagnostic value for brain death when used in isolation.