PMC8741391_01
EEG showing predominant centrotemporal spikes and waves on the right side (voltage 70 mV/cm).
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fig1
His electroencephalogram (EEG) showed high voltage, diphasic spikes with slow activity predominantly on the right central-temporal region, creating a horizontal dipole with maximal electronegativity in the right centrotemporal region (Figure 1).
Abnormal EEG showing electrical status following increased carbamazepine dose (voltage 70 mV/cm).
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fig2
The repeat sleep EEG showed almost continuous spikes and wave activity suggestive of electrical status in slow-wave sleep, and the diagnosis of nonconvulsive status was established (Figure 2).
Abnormal EEG showing features of encephalopathy following sodium valproate (voltage 70 mV/cm).
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fig3
A repeat EEG was carried out during the drowsiness period and showed generalised high amplitude delta activity without frank evidence of epilepsy was in favour of evolving encephalopathy (Figure 3).