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Published on: July 11, 2025
Auditory brainstem response: prognostic value in patients with a score of 3 on the Glasgow Coma Scale
Luiz Carlos A de Sousa1, Benedicto O Colli, Marcelo R T Piza
1Paparella Otorhinolaryngology Association, Faculty of Medicine, University of Ribeirão Preto, Brazil. lcarlos@clinicapaparella.com.br
Objective:
To evaluate the prognostic value of auditory brainstem response (ABR) recorded in comatose patients presenting a score of 3 on the Glasgow Coma Scale (GCS = 3).
Patients:
One hundred thirty-eight patients in coma at GCS = 3 due to various etiologic agents.
Intervention:
To record and analyze tracings of ABR.
Main Outcome Measure:
Tracings from ABR were classified into four types (B1, B2, B3, and B4) on the basis of synchrony of waves.
Results:
The Fischer's exact test used for comparison between death proportions revealed that B1 is different from B2, B3, or B4 and the association B2 + B3 + B4.
Conclusion:
Auditory brainstem response is a useful tool with prognostic value for patients in coma with GCS = 3. It was demonstrated in our series that once the patient presented an abnormal ABR (B2, B3, or B4), he had a greater probability of dying than a patient with a normal ABR (B1).
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