Which electrophysiological modalities may be considered for neuroprognostication after cardiac arrest?

Which electrophysiological modalities may be considered for neuroprognostication after cardiac arrest?

• A. Electroencephalography (EEG)
• B. Somatosensory evoked potential (SSEP)
• C. Electroencephalography (EEG) and somatosensory evoked potential (SSEP)
• D. Magnetic resonance imaging (MRI)

Answer: (C)

Neuroprognostication after cardiac arrest relies on functional assessments of brain activity, and two electrophysiological tests are commonly used for this purpose: electroencephalography (EEG) and somatosensory evoked potentials (SSEP). EEG tracks the brain’s electrical activity over time and can reveal patterns that correlate with worse outcomes, such as severely suppressed or absent activity and lack of reactivity, especially when sedation has been minimized or accounted for. SSEP measures the integrity of the somatosensory pathways from the peripheral nerves to the cortex; specifically, the bilateral absence of the cortical N20 response is highly specific for poor prognosis. Using both tests together gives complementary information: EEG reflects overall cortical activity and reactivity, while SSEP assesses subcortical-to-cortical pathway integrity. This combination improves prognostic accuracy more than either test alone. MRI is an imaging modality, not electrophysiological, so it’s not included in this electrophysiology-focused approach.

Neuroprognostication after cardiac arrest relies on functional assessments of brain activity, and two electrophysiological tests are commonly used for this purpose: electroencephalography (EEG) and somatosensory evoked potentials (SSEP). EEG tracks the brain’s electrical activity over time and can reveal patterns that correlate with worse outcomes, such as severely suppressed or absent activity and lack of reactivity, especially when sedation has been minimized or accounted for. SSEP measures the integrity of the somatosensory pathways from the peripheral nerves to the cortex; specifically, the bilateral absence of the cortical N20 response is highly specific for poor prognosis.

Using both tests together gives complementary information: EEG reflects overall cortical activity and reactivity, while SSEP assesses subcortical-to-cortical pathway integrity. This combination improves prognostic accuracy more than either test alone. MRI is an imaging modality, not electrophysiological, so it’s not included in this electrophysiology-focused approach.