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Quasi‑Seizure (Non‑convulsive Event)

What is Quasi‑Seizure (Non‑convulsive Event)?

A quasi‑seizure, also called a non‑convulsive event (NCE) or psychogenic non‑epileptic seizure (PNES), is a sudden, episode‑like disturbance in behavior, awareness, or motor function that mimics an epileptic seizure but does not involve the abnormal electrical discharges seen on an electroencephalogram (EEG). These events are often driven by psychological stress, underlying medical conditions, or metabolic disturbances rather than true epileptic activity. Because they lack the classic convulsive movements, they can be easily missed or misdiagnosed, leading to unnecessary antiepileptic drugs (AEDs) and delayed treatment of the root cause.

The term “quasi‑seizure” highlights the overlap in presentation with epileptic seizures while emphasizing the distinct pathophysiology. Understanding the difference is crucial for appropriate management and for preventing chronic disability.

Common Causes

Quasi‑seizures can arise from a broad spectrum of medical, psychiatric, and metabolic conditions. The most frequently encountered causes include:

• Psychogenic Non‑Epileptic Seizures (PNES) – stress‑related or trauma‑related conversion disorder.
• Syncope (fainting) – especially vasovagal episodes that present with brief loss of consciousness.
• Cardiac arrhythmias – supraventricular tachycardia or bradyarrhythmias that cause cerebral hypoperfusion.
• Metabolic disturbances – severe hypoglycemia, hyponatremia, or hypercapnia.
• Medication or drug toxicity – benzodiazepine withdrawal, opioid overdose, or anticholinergic toxicity.
• Brain lesions – tumors, stroke, or traumatic brain injury that produce focal neurological deficits without epileptiform EEG.
• Sleep disorders – narcolepsy with cataplexy or parasomnias that can mimic seizure‑like activity.
• Infectious encephalopathies – Creutzfeldt‑Jakob disease, hepatic encephalopathy, or severe meningitis.
• Autoimmune encephalitis – antibodies against neuronal surface antigens can produce non‑convulsive seizures.
• Neurodegenerative diseases – early Alzheimer’s disease or Lewy body dementia may present with brief periods of staring or confusion.

Associated Symptoms

Because quasi‑seizures are heterogeneous, the accompanying features vary, but common patterns include:

• Sudden loss of awareness or “blank stare” lasting seconds to minutes.
• Brief motor changes – jerking of a single limb, stiffening, or head turning.
• Flushing, pallor, or sweating.
• Breathing irregularities (e.g., hyperventilation) or shortness of breath.
• Post‑event confusion or amnesia that is often shorter than after a true tonic‑clonic seizure.
• Emotional triggers immediately before the event (e.g., anxiety, anger, or remembered trauma).
• Absence of post‑ictal fatigue, tongue biting, or urinary incontinence (though they can occasionally occur).
• Headache or neck pain if the event was precipitated by a cervical strain or orthostatic change.

When to See a Doctor

Any new, unexplained or recurrent episode that resembles a seizure warrants medical evaluation. Seek care promptly if you notice:

• Repeated episodes that interfere with work, school, or daily activities.
• Injury during an event (e.g., falls, head trauma).
• Rapid onset of confusion, weakness, or speech difficulty lasting >5 minutes.
• Associated chest pain, palpitations, or shortness of breath.
• History of heart disease, diabetes, or known brain lesions.
• New‑onset episodes after a medication change or after substance use.
• Any event that lasts longer than 5 minutes or does not resolve spontaneously.

Diagnosis

1. Detailed Clinical History

Physicians start with a thorough interview covering:

• Exact description of the event(s) – what the patient saw, felt, and how long it lasted.
• Triggers, preceding stressors, and post‑event symptoms.
• Medication list, substance use, and recent changes.
• Past medical and psychiatric history.

2. Physical and Neurological Examination

Focused examination looks for focal deficits, heart murmurs, or signs of autonomic instability.

3. Electroencephalography (EEG)

A standard or video‑EEG is the cornerstone test. In true epileptic seizures, the EEG shows evolving ictal patterns; in quasi‑seizures, the EEG remains normal or shows only nonspecific changes. Prolonged monitoring (24‑48 h) increases diagnostic yield, especially for intermittent events.

4. Cardiac Evaluation

Baseline ECG, Holter monitoring, or event recorder is performed when arrhythmia is suspected.

5. Laboratory Tests

Basic metabolic panel, blood glucose, calcium, magnesium, and toxicology screen help rule out metabolic or drug‑related causes.

6. Neuroimaging

Magnetic resonance imaging (MRI) or CT scan is ordered if a structural brain lesion is in the differential.

7. Psychiatric Assessment

When PNES is suspected, a mental‑health professional evaluates for conversion disorder, anxiety, depression, or post‑traumatic stress disorder (PTSD).

Treatment Options

Medical Therapies

• Address underlying medical cause:
  • Correct hypoglycemia with glucose, hyponatremia with controlled saline infusion.
  • Treat arrhythmias with beta‑blockers, pacemaker, or ablation as indicated.
  • Manage infections with appropriate antibiotics or antivirals.
• Antiepileptic drugs (AEDs): Only prescribed when EEG confirms epileptic activity. Unnecessary AEDs can worsen PNES.
• Psychotropic medications: SSRIs, SNRIs, or low‑dose benzodiazepines may help when anxiety, depression, or PTSD contribute.

Therapeutic Interventions

• Cognitive‑behavioral therapy (CBT): First‑line for PNES; focuses on recognizing triggers and developing coping strategies.
• Psychotherapy: Trauma‑focused therapy (e.g., EMDR) for patients with a history of abuse or severe stress.
• Biofeedback & relaxation training: Helps patients gain control over autonomic responses.
• Physical therapy: When post‑event weakness or gait disturbance persists.

Home and Lifestyle Measures

• Maintain a regular sleep schedule – 7‑9 hours nightly.
• Limit caffeine, alcohol, and recreational drugs.
• Practice stress‑reduction techniques (mindfulness, deep‑breathing, yoga).
• Keep a symptom diary noting triggers, duration, and preceding activities.
• Educate family, coworkers, and teachers on how to respond safely during an event.

Prevention Tips

While not all quasi‑seizure triggers are preventable, the following strategies lower recurrence risk:

• Identify and avoid personal triggers: Presentation of stressful work situations, crowded environments, or sleep deprivation.
• Adhere to treatment plans: Take prescribed psychiatric medications, attend therapy appointments, and follow medical recommendations for chronic conditions.
• Regular monitoring: For patients with known cardiac or metabolic disorders, schedule routine labs and cardiac check‑ups.
• Healthy lifestyle: Balanced diet rich in electrolytes, regular aerobic exercise, and adequate hydration.
• Emergency action plan: Keep a written plan at home and work describing what to do if an episode occurs.

Emergency Warning Signs

Key Take‑aways

• Quasi‑seizures mimic epileptic seizures but lack the characteristic EEG changes.
• Causes are diverse—ranging from psychological stress (PNES) to cardiac arrhythmias, metabolic imbalances, and structural brain disease.
• Accurate diagnosis relies on video‑EEG, cardiac testing, labs, and a thorough history.
• Treatment focuses on the underlying trigger: psychotherapies for PNES, metabolic correction, or cardiac management.
• Early professional evaluation is essential to avoid unnecessary AED use and to prevent complications.

For more detailed information, consult reputable sources such as the Mayo Clinic, CDC, NIH, WHO, and the Cleveland Clinic. Always discuss symptoms and treatment options with a qualified healthcare professional.

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