Formulated Research Question:
Population: ED patients with altered mental status (AMS) Intervention: Micro-EEG Comparison: Standard EEG Outcomes: 1. Sensitivity, specificity, positive/negative likelihood ratios of micro-EEG in identifying non-convulsive seizures and abnormal brain activities 2. The concordance of EEG interpretations between micro-EEG and standard EEGs recordings Design Prospective cross-sectional
Definitions:
Altered Mental Status: Any acute change in level of arousability or responsiveness (e.g. confusion, lethargy, delirium, coma, aphasia, disinhibition, labile/blunted affect or unexpected psychosis).
Types of AMS (for the purpose of the study):
1. AMS alone
2. AMS with non-specific motor activity (subtle motor movement such as eye blinking, nystagmus, focal motor movements, or myoclonus)
3. Prolonged AMS following one or more tonic-clonic seizures suggesting status epilepticus Non-convulsive seizure (NCZ):A seizure without clonic or tonic activity or other convulsive motor activity.
Status Epilepticus (SE):SE is defined as 1. More than 30 minutes of continuous seizure activity or 2. Two or more sequential seizures without recovery of consciousness between seizures.
