Focal Aware Seizures (Simple Partial): Symptoms, Causes, and Management

Focal aware seizures (formerly simple partial seizures) involve abnormal electrical activity restricted to one brain hemisphere without impairment of consciousness.

Symptom Categories (by Cortical Region)

Olfactory/Gustatory (mesial temporal): Burning rubber, metallic taste

Autonomic (insula/hypothalamus): Flushing, piloerection, heart rate change, epigastric rising

Psychic (limbic): Déjà vu, jamais vu, fear, euphoria, time distortion

Lobe / Area	Manifestations
Motor cortex	Rhythmic jerking (clonic), tonic posturing, versive head/eye deviation
Somatosensory	Tingling, numbness, pain, thermal sensations (often unilateral)
Visual (occipital)	Flashes, colors, shapes, hallucinations (formed/unformed)
Auditory (temporal)	Buzzing, ringing, voices, music

Key Features

• Duration: seconds to 2 minutes.
• Consciousness preserved — patient interacts, remembers.
• May evolve to focal impaired awareness or bilateral tonic-clonic.
• Postictal: usually minimal; possible Todd's paresis (transient weakness).

Etiologies

• Structural: glioma, cortical dysplasia, stroke, trauma, encephalomalacia.
• Genetic: SCN1A, DEPDC5, other epilepsy genes.
• Metabolic, infectious, autoimmune.

Management

• ASM selection by seizure type/focal onset (lamotrigine, levetiracetam, carbamazepine, lacosamide).
• Epilepsy surgery evaluation if drug-resistant (lesionectomy, laser ablation).
• Safety counseling: driving laws, injury prevention.