Evaluation and prognostication in coma

Area of Science:

• Neurophysiology
• Intensive Care Medicine
• Neurology

Background:

• Neurophysiologic techniques, including electroencephalography (EEG) and evoked potentials (EPs), offer valuable insights into patient physiological status and therapeutic responses.
• Serial or continuous monitoring can detect critical changes before irreversible patient deterioration.
• Advancements in computer technology facilitate the simultaneous display and correlation of electrophysiologic data with cardiovascular status and intracranial pressure (ICP).

Purpose of the Study:

• To highlight the established role and utility of neurophysiologic tests in the neurological intensive care unit (NICU).
• To emphasize the diagnostic and prognostic value of continuous EEG and EP monitoring.
• To underscore the impact of these techniques on clinical decision-making and patient management.

Main Methods:

• Continuous electroencephalography (EEG) monitoring in the intensive care unit (ICU).
• Somatosensory and auditory evoked potential (EP) testing.
• Motor evoked potential (MEP) evaluation.

Main Results:

• Continuous EEG monitoring influenced medical decision-making in over 75% of patients.
• Continuous EEG monitoring identified previously unrecognized non-convulsive seizures in approximately 67% of patients.
• Somatosensory and auditory EPs provided prognostic information in comatose patients, while motor EPs aided in assessing motor system abnormalities.

Conclusions:

• Neurophysiologic tests are indispensable monitoring tools within the neurological intensive care unit.
• Continuous EEG monitoring is highly effective in guiding clinical management and detecting critical events like seizures.
• Evoked potentials offer valuable prognostic and diagnostic information when integrated within the broader clinical context.