It was also reported that because 88% of the electrographic seizures had been detected within the first 24 hours, at least 24 hours of monitoring is required to detect nonconvulsive seizures
in patients with a coma (9).
Grant, "Nonconvulsive seizures
in patients presenting with altered mental status: an evidence-based review," Epilepsy & Behavior, vol.
Ongoing nonconvulsive seizures
originating from the left hemisphere were seen on continuous electroencephalography (EEG).
EEG monitoring continued throughout therapy and consistently showed marked generalized slowing consistent with a global or multifocal cerebral dysfunction, extreme delta brush pattern consistent with anti-NMDAr encephalitis (Schmitt et al., 2012) and abundant rhythmic delta activity suspicious for nonconvulsive seizures
. EEG consistently ruled out correlation between the dyskinetic movement and seizure activity.
They introduce EEG monitoring, including basic and advanced EEG patterns seen in specific and nonspecific encephalopathy, nonconvulsive seizures
, cerebrovascular disease, periodic EEG patterns, and controversial patterns on the ictal-interictal continuum.
Absence and simple partial seizures are nonconvulsive seizures
that produce an altered sense of consciousness.