Generalized Onset Seizures and Impaired Awareness

Classification and Diagnosis

Generalized seizures are classified as motor and non-motor (absence) seizures according to the International League Against Epilepsy classification system 1
Generalized seizures involve both cerebral hemispheres from the onset and can be categorized into different types with varying effects on consciousness, with motor manifestations including bilateral tonic-clonic movements, and non-motor manifestations including staring spells indicating impaired awareness 1
EEG findings are crucial for diagnosis, with generalized seizures typically showing bilateral, synchronous discharges 3

MRI is the preferred neuroimaging modality when imaging is indicated, though it is rarely needed in neurologically normal patients with typical generalized seizures due to their genetic underpinnings 3
EEG is recommended as part of the neurodiagnostic evaluation, particularly to differentiate between generalized and focal seizures 4
Laboratory tests should be ordered based on individual clinical circumstances, especially if there are suggestive findings of metabolic disturbances 4

In patients with 22q11.2 deletion syndrome, seizures can be of various types, including generalized tonic-clonic, typical or atypical absences, myoclonic, or focal with preserved or impaired awareness 2
Some generalized seizures, particularly myoclonic seizures, may occur without significant impairment of awareness 2

The frequency of recurrence for focal seizures (up to 94%) is considerably higher than for generalized seizures (approximately 72%), which may influence management decisions 5
Seizure classification should be based on clinical presentation, EEG findings, and response to treatment rather than assumptions about awareness 3
Focal seizures with secondary generalization should not be confused with primary generalized seizures, as they have different mechanisms and treatment implications 3