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[Auditory evoked brain-stem responses (ABRs) in brain dead status]
No to Shinkei = Brain and Nerve
|September 1, 1984
Summary
Auditory evoked brain-stem responses (ABRs) may not be fully absent in brain death cases. Some brain dead patients still exhibit ABR waves, suggesting ABRs have limited clinical utility for diagnosing brain death.
Area of Science:
- Neuroscience
- Clinical Neurology
Background:
- Brain death diagnosis is critical for organ donation and patient management.
- Auditory evoked brain-stem responses (ABRs) are used to assess brainstem function.
Purpose of the Study:
- To evaluate the utility of ABRs in diagnosing brain death.
- To investigate the presence of ABR waves in clinically diagnosed brain dead patients.
Main Methods:
- Recorded ABRs in 52 patients suspected of brain death.
- Classified patients based on clinical criteria and cerebral angiography.
- Analyzed ABR wave presence in relation to brain death diagnosis.
Main Results:
- 14 out of 19 brain dead patients (74%) showed no identifiable ABR waves.
- 5 patients (26%) exhibited at least the 1st ABR wave, despite meeting clinical criteria for brain death.
- Barbiturate therapy did not consistently abolish ABRs; 3 of 8 treated patients had identifiable waves.
Conclusions:
- ABRs may not be entirely absent in all brain death cases, questioning their definitive diagnostic utility.
- The gradual progression of brain death might explain the presence of residual ABR activity.
- Further research is needed to understand barbiturate effects on ABRs in brain death.