PMC4436507_01
The initial EEG tracing demonstrates generalized rhythmic and semirhythmic delta frequency activity at 1 Hz with superimposed, frontally predominant bursts of rhythmic beta frequency activity. High pass filter 1 Hz; low pass filter 70 Hz; notch filter off representing extreme delta brush.
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His initial EEG showed intermitted slowing of delta range over both frontocentral head regions with faster frequency superimposed representing extreme delta brush (Fig. 1).
EEG obtained 4 days after admission showing generalized rhythmic delta activity. The evolution of the EEG pattern is suggestive of NCES. The calibration mark represents 1 s and 100 muV.
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Continuous EEG recording (CEEG) was advised, and it showed a rhythmical slowing over both frontocentral head regions with a clear evolution in voltage, frequency, and field consistent with nonconvulsive status epilepticus (NCSE) (Fig. 2).
EEG from one 30-second epoch including the 10-second period represented in Fig. 2 demonstrating evolution of the ictal pattern over time. The calibration mark represents 1 s and 100 muV.
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This evolution of the EEG pattern became more apparent when the EEG was compressed (Fig. 3).