Commplex partial seizure
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"focal impaired awareness seizure" OR "complex partial seizure"
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Complex Partial Seizure (Focal Seizure with Impaired Awareness)
Terminology Update
The term "complex partial seizure" is no longer standard. The 2017 ILAE classification replaced it with "focal seizure with impaired awareness" (previously: focal onset seizure with impaired awareness). The older terms "simple partial" and "complex partial" have been eliminated; seizures are now classified based on:
- Focal vs. generalized onset
- Awareness status (intact or impaired)
- Motor vs. nonmotor onset
(Bradley & Daroff's Neurology; Harrison's, 22e)
Definition
A focal seizure with impaired awareness (complex partial seizure) arises from a localized neuronal network within one cerebral hemisphere and is accompanied by transient impairment of the patient's ability to maintain normal contact with the environment — the patient cannot respond appropriately to commands and has impaired recollection of the ictal phase.
Clinical Features
Aura (Simple Partial Onset)
The seizure commonly begins with an aura — a focal seizure without cognitive disturbance that may include:
- Visceral/autonomic: epigastric rising sensation (classic temporal lobe aura), flushing, piloerection
- Psychic: fear, déjà vu, depersonalization, dreamlike feelings
- Sensory: olfactory (acrid odors — burning rubber, bleach), gustatory (bitter/metallic), visual hallucinations, formed sounds
- Cognitive: micropsia, macropsia
Ictal Phase
- Onset with a motionless stare marking the beginning of impaired awareness
- Duration: typically 1–2 minutes (range: seconds to several minutes)
- Automatisms — involuntary repetitive movements, more complex than those seen in absence seizures:
- Oral: lip smacking, chewing, swallowing
- Manual: fumbling/picking at clothing, hand rubbing
- Ambulatory: walking, trying to stand up
- Elaborate: emotional display, running (more common with frontal lobe onset)
- May also manifest as behavior arrest (patient freezes)
Localization by Lobe
| Lobe | Characteristic Features |
|---|---|
| Medial temporal | Rising epigastric aura, lip smacking, postictal nose rubbing, amnesia |
| Frontal | Hypermotor behaviors, bicycling, pelvic thrusting; often no postictal confusion; frequently misdiagnosed as pseudoseizures |
| Occipital | Unformed visual hallucinations, contralateral eye deviation |
Postictal Period
- Gradual return to normal consciousness (minutes to hours)
- Anterograde amnesia for the ictal event
- Transient neurologic deficits possible (aphasia, hemiparesis — Todd's paralysis, neglect)
- Confusion and somnolence; can last longer in elderly or those with prior CNS injury
Secondary Generalization
If the focal seizure propagates widely, it may evolve into a bilateral tonic-clonic seizure — especially common with frontal lobe onset.
EEG Findings
- Interictal: Often normal; may show focal epileptiform discharges (spikes or sharp waves) over the seizure focus
- Ictal: May show rhythmic focal discharge; can be nonlocalizing on scalp EEG when focus is in the medial temporal or inferior frontal lobe (deep from scalp)
- Gold standard for difficult localization: video-EEG monitoring; intracranial electrode placement (depth electrodes, subdural grids)
(Harrison's 22e; Washington Manual)
Comparison: Focal Impaired Awareness vs. Absence Seizures
| Feature | Focal Impaired Awareness | Typical Absence |
|---|---|---|
| Duration | 30 seconds – several minutes | Seconds (usually <30 s) |
| Aura | Often present | No |
| Automatisms | Complex, prominent | Simple/subtle |
| Postictal confusion | Yes | No |
| Age of onset | Any age | Childhood/adolescence |
| EEG | Focal, often temporal | Generalized 3 Hz spike-wave |
| MRI finding | May be structural (e.g., hippocampal sclerosis) | Usually normal |
(Neuroanatomy through Clinical Cases, 3e; Bradley & Daroff's)
Etiology & Common Causes
- Mesial temporal sclerosis / hippocampal sclerosis — most common cause of refractory temporal lobe epilepsy
- Cortical dysplasia
- Brain tumors
- Vascular malformations, prior stroke, hemorrhage
- Head trauma
- CNS infections (HSV encephalitis, meningitis)
- Autoimmune encephalitis
- Genetic/hereditary (tuberous sclerosis, Sturge–Weber)
Diagnosis
History: Eyewitness account is critical; ask about aura, automatisms, postictal confusion, tongue biting, incontinence, duration.
Investigations:
- Blood: glucose, electrolytes (Na, Ca, Mg, P), CBC, LFTs, AED levels if applicable, urine drug screen
- Neuroimaging: Brain MRI (with/without contrast, thin coronal cuts through hippocampus) — mandatory for focal seizures; superior to CT for structural lesions
- EEG: Routine EEG indicated for all new-onset seizures; video-EEG for diagnosis of nonepileptic spells or surgical evaluation
- LP: If CNS infection suspected; send HSV PCR
- Elevated serum prolactin (within 20 min of seizure) strongly suggests epileptic (vs. psychogenic) origin for generalized or complex partial seizures
Treatment
When to Start AEDs
- Single unprovoked seizure: Typically not started unless abnormal EEG or structural lesion on MRI (high recurrence risk)
- Epilepsy (≥2 unprovoked seizures): AED treatment generally started; ~75% risk of further seizures after second event
- Provoked seizures: treat underlying cause first; avoid AEDs routinely
Drug Selection for Focal (Complex Partial) Seizures
| Priority | Drugs |
|---|---|
| First-line | Carbamazepine, phenytoin (narrow-spectrum) |
| Second-line | Levetiracetam, valproate, oxcarbazepine |
| Third-line | Lamotrigine, topiramate, vigabatrin |
Narrow-spectrum AEDs (carbamazepine, phenytoin, oxcarbazepine, gabapentin, pregabalin) are most appropriate for focal seizures.
Broad-spectrum AEDs (valproate, lamotrigine, levetiracetam, topiramate) work for both focal and generalized seizures.
(Adams & Victor's Neurology, 12e; Washington Manual; Barash Clinical Anesthesia)
Non-pharmacological / Surgical
- Temporal lobectomy / cortical resection: Highly effective for mesial temporal lobe epilepsy refractory to medications (~60–70% seizure freedom)
- Pre-surgical workup: neuropsychology testing, ictal SPECT/PET, functional MRI, Wada test, intracranial EEG if needed
- Vagus nerve stimulation, responsive neurostimulation (RNS): For patients not surgical candidates
Differential Diagnosis
- Absence seizures (shorter, no postictal confusion, 3 Hz EEG)
- Transient ischemic attack
- Convulsive syncope
- Migraine with aura
- Psychogenic nonepileptic seizures (PNES/pseudoseizures)
- Toxic-metabolic encephalopathy
- Sleep disorders (REM behavior disorder)
Sources: Bradley & Daroff's Neurology in Clinical Practice; Harrison's Principles of Internal Medicine, 22e; Washington Manual of Medical Therapeutics; Adams & Victor's Principles of Neurology, 12e; Neuroanatomy through Clinical Cases, 3e
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