Nonconvulsive Status Epilepticus MCQ — NEET PG Practice Question | NEETPGAI
Nonconvulsive Status Epilepticus
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stethoscope Medicine
A 58-year-old man with a history of stroke is admitted to the ICU with unexplained altered mental status and no visible convulsive movements. Routine EEG shows no abnormalities. However, continuous EEG monitoring over 24 hours reveals the pattern marked **B** in the diagram—rhythmic discharges with clinical improvement following IV lorazepam administration. Which of the following best describes this EEG finding and its clinical significance?
A. Nonconvulsive status epilepticus; accounts for 8-37% of comatose ICU patients and requires immediate antiseizure therapy to reduce mortality
B. Generalized periodic sharp wave complexes; associated with prion disease and requires specific immunotherapy
C. Benign sleep artifact; requires no treatment and does not contribute to altered mental status in ICU patients
D. Interictal epileptiform activity; indicates resolved seizures and does not require urgent intervention
Explanation
Why option 1 is correct
The pattern marked B represents nonconvulsive status epilepticus (NCSE)—continuous or recurrent seizure activity lasting >5–10 minutes without overt convulsive movements, diagnosable only by EEG. The clinical improvement after IV lorazepam is pathognomonic for NCSE and satisfies the Salzburg Criteria for diagnosis. NCSE is dramatically underrecognized in ICU patients with unexplained altered mental status, accounting for 8–37% of comatose patients without obvious cause. Early recognition via continuous EEG monitoring (cEEG) and prompt first-line IV antiseizure therapy (lorazepam 0.1 mg/kg or midazolam) are essential, as delayed treatment beyond 24 hours triples mortality. The patient's risk factors (prior stroke, altered mental status) align with established NCSE epidemiology.
Why each distractor is wrong
Option 2 (Benign sleep artifact): Sleep spindles and other benign artifacts do not respond to IV antiseizure medication and do not cause unexplained altered mental status. The clinical improvement after lorazepam is the key diagnostic clue that excludes artifact.
Option 3 (Interictal epileptiform activity): Interictal discharges indicate seizure risk but are not themselves seizures and do not cause acute altered mental status. NCSE is defined by continuous or recurrent seizure activity, not isolated interictal spikes, and requires urgent treatment.
Option 4 (Generalized periodic sharp waves from prion disease): While periodic sharp waves can occur in prion disease (CJD), they are not responsive to antiseizure medication and are not associated with clinical improvement after lorazepam. The lorazepam response excludes this diagnosis.
High-YieldNEET PG
NCSE is the great mimicker of unexplained coma in ICU; continuous EEG for 24–48 hours is standard of care in any comatose patient without clear etiology, as intermittent EEG misses ~50% of seizures.
Harrison 21e; Neurocrit Care 2012 guidelines
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