Brain-Stem Auditory Evoked Potential Monitoring. The Increase of the Stimulus Artifact in The Development of Brain Death: A Biological Phenomenon?

Abstract

Brain-stem auditory evoked potentials (Baeps) were recorded in 12 dead subjects (mean age, 72.6 + 14.8 years), 30.6 ± 19.5 hours (range 9-70) after abolished systemic circulation. Death was due to cardiac failure (n = 10), intracerebral hemorrhage (n = 1) and larynx cancer (n = 1). The presence and amplitude of the stimulus artifact were evaluated. The mean (±SD) amplitudes of the stimulus artifact was 0.03 ± 0.02 μV on the left side and 0.01 ± 0.02 μV on the right side. These findings in accordance with previous studies on comatose patients and brain dead subjects confirm that the increase of the stimulus artifact in the development of brain death, in spite of stimulation with alternating polarity, seems to reflect a biological phenomenon which is not found in dead subjects after complete cessation of systemic circulation.

Key Words:

• Brain-stem auditory evoked potentials
• Baep monitoring
• brain death
• death
• stimulus artifact
• dead subjects
• coma