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Quasi‑Seizure Disorder: A Patient‑Friendly Medical Guide

Overview

Quasi‑seizure disorder, also called psychogenic nonepileptic seizures (PNES) or functional seizure disorder, is a condition in which a person experiences seizure‑like episodes that are not caused by abnormal electrical activity in the brain. Instead, the episodes arise from psychological mechanisms, often linked to stress, trauma, or other mental‑health conditions. Although the outward appearance can closely mimic epileptic seizures—staring, shaking, loss of bladder control—the underlying cause is functional rather than structural.

PNES is recognized by major neurology and psychiatry societies, including the International League Against Epilepsy (ILAE) and the American Psychiatric Association (APA). It sits within the broader category of functional neurological symptom disorder (FNSD).

Who Is Affected?

• Women are diagnosed more often than men, with a ratio of roughly 2–3 : 1.<sup>[1]</sup>
• Typical age of onset is late adolescence to early adulthood (15‑35 years), but PNES can appear at any age.
• People with a history of trauma (physical, sexual, or emotional), anxiety, depression, or personality disorders are at higher risk.<sup>[2]</sup>

Prevalence

Estimates vary because diagnosis requires video‑EEG monitoring, but epidemiological studies suggest:

• PNES accounts for about 5‑10 % of patients referred to epilepsy centers.<sup>[3]</sup>
• In the general population, the lifetime prevalence is roughly 2–5 cases per 1,000 people.<sup>[4]</sup>
• Approximately 30‑40 % of patients initially diagnosed with epilepsy are later re‑diagnosed with PNES after proper testing.<sup>[5]</sup>

Symptoms

Symptoms are diverse and can mimic many types of epileptic seizures. The following list includes the most common manifestations, with brief descriptions to help differentiate PNES from true epilepsy.

• Altered awareness or “blank stare” – a sudden, non‑responsive look that can last seconds to minutes.
• Motor activity – irregular, asynchronous movements such as flailing arms, thrashing, or stiffening that do not follow the classic tonic‑clonic pattern.
• Pelvic thrusting or pelvic floor muscle activity – rare in epileptic seizures.
• Side‑to‑side head or body shaking – often slower and more rhythmic than the jerks seen in epilepsy.
• Preserved or variable breathing – patients may continue to breathe normally, whereas epileptic seizures often cause brief apnea.
• Prolonged duration – episodes commonly last longer than 2 minutes, while most epileptic seizures stop within 1‑2 minutes.
• Lack of post‑ictal confusion – after a PNES event, the person typically regains normal cognition quickly.
• Resistance to eye opening – patients may keep their eyes tightly closed, which is uncommon in epilepsy.
• Emotional triggers – stress, arguments, or reminders of traumatic events often precede an episode.
• Variable consistency – the same individual may have episodes that look different each time.
• Urinary or fecal incontinence – can occur but is less frequent and often less “forced” than in tonic‑clonic seizures.

Because these features overlap with epileptic seizures, a thorough evaluation—including video‑EEG monitoring—is essential for accurate diagnosis.

Causes and Risk Factors

PNES is a complex disorder with biopsychosocial roots. No single cause explains all cases; rather, an interplay of psychological, neurobiological, and social factors contributes.

Psychological Mechanisms

• Conversion theory – the brain converts emotional distress into physical symptoms as a protective strategy.
• Defensive dissociation – severe trauma can lead to dissociative states that manifest as seizure‑like activity.
• Reinforcement – attention, care, or avoidance of stressful situations can unintentionally reinforce the behavior.

Neurobiological Correlates

Functional MRI and PET studies show altered connectivity in brain regions that regulate emotion, stress, and motor control (e.g., the limbic system, supplementary motor area). However, these changes are functional, not structural.

Key Risk Factors

• History of childhood abuse or neglect.
• Recent or chronic interpersonal stress (e.g., divorce, job loss).
• Co‑existing psychiatric diagnoses: major depressive disorder, anxiety disorders, PTSD, borderline personality disorder.<sup>[6]</sup>
• Previous diagnosis of epilepsy (misdiagnosis) or epilepsy medication side‑effects.
• Family history of functional neurological disorders.
• Low socioeconomic status and limited access to mental‑health care.

Diagnosis

Diagnosing PNES involves ruling out epileptic seizures and identifying the functional nature of the episodes. The process typically follows several steps.

Clinical Interview & History

• Detailed description of the episodes (onset, triggers, duration, recovery).
• Medical, psychiatric, and trauma histories.
• Medication review (some antiepileptics can cause side‑effects mimicking seizures).

Neurological Examination

Usually normal between events. Neurologists look for subtle signs that suggest a functional disorder (e.g., “give‑away” weakness).

Electroencephalogram (EEG)

A standard EEG may be normal, but a video‑EEG monitoring study—recording brain activity and video simultaneously—is the gold standard. During an event, the EEG will show no ictal (seizure) discharges in PNES, whereas epileptic seizures display characteristic spikes or rhythmic activity.

Additional Tests (when needed)

• MRI of the brain – to exclude structural lesions.
• Cardiac monitoring – if arrhythmias are suspected.
• Psychiatric assessment – standardized tools such as the Beck Depression Inventory (BDI) or PTSD Checklist (PCL‑5).

Diagnostic Criteria (DSM‑5)

According to the DSM‑5, a diagnosis of Functional Neurological Symptom Disorder (Conversion Disorder) with seizure‑type symptoms requires:

1. One or more symptoms of altered voluntary motor or sensory function.
2. Incompatibility between the symptom and recognized neurological conditions.
3. Symptoms cause clinically significant distress or impairment.
4. Not better explained by another medical condition.

Treatment Options

Effective treatment is multimodal, combining psychotherapy, education, and, when needed, medication for comorbid psychiatric conditions.

1. Psychoeducation

Understanding that the episodes are real but not caused by epilepsy is the cornerstone. Studies show that clear explanations improve adherence and reduce seizure frequency by 30‑50 %.<sup>[7]</sup>

2. Psychotherapy

• Cognitive‑behavioral therapy (CBT) – targets maladaptive thoughts and builds coping skills. Randomized trials report a 40‑60 % reduction in seizure frequency.<sup>[8]</sup>
• Trauma‑focused therapies (e.g., EMDR, prolonged exposure) – essential for patients with a history of abuse.
• Dialectical behavior therapy (DBT) – helpful for borderline personality traits and emotional dysregulation.

3. Medications

There are no antiepileptic drugs that treat PNES directly. However, pharmacotherapy may address comorbid conditions:

• SSRIs (e.g., sertraline, fluoxetine) – for depression and anxiety.
• SNRIs (e.g., venlafaxine) – beneficial for PTSD.
• Atypical antipsychotics (e.g., quetiapine) – low‑dose use for severe agitation or insomnia.
• Medication should be prescribed by a psychiatrist and monitored closely.

4. Physical Rehabilitation

Occupational or physical therapy can aid in re‑training normal movement patterns, especially when PNES is accompanied by functional weakness.

5. Multidisciplinary Clinics

Many tertiary epilepsy centers now run dedicated PNES clinics that bring together neurologists, psychiatrists, psychologists, and social workers. Patients managed in such settings have higher remission rates (up to 70 % at 2 years).<sup>[9]</sup>

Living with Quasi‑Seizure Disorder

Beyond medical treatment, everyday strategies can improve quality of life and prevent episodes.

Self‑Management Tips

• Maintain a seizure diary – record triggers, duration, and emotional state.
• Stress‑reduction techniques – deep breathing, progressive muscle relaxation, mindfulness meditation, or yoga.
• Regular sleep schedule – aim for 7‑9 hours; sleep deprivation is a common trigger.
• Limit alcohol and caffeine – both can increase anxiety and lower seizure threshold.
• Exercise – moderate aerobic activity (30 min, 3‑5 times/week) improves mood and reduces stress.
• Build a support network – inform close family/friends about the condition so they can respond appropriately during an event.
• Develop a “plan‑B” response – agree on steps to take if a seizure‑like episode occurs (e.g., safe positioning, reassurance, avoid restraining).

Work & School Considerations

Most people with PNES can continue work or study with accommodations:

• Flexible scheduling to allow therapy appointments.
• Designated quiet space for stress‑reduction breaks.
• Education for supervisors or teachers about the disorder.

Legal & Driving Issues

Regulations vary by country. In the United States, the CDC and state motor vehicle departments typically require a seizure‑free period (often 6 months) before issuing or renewing a driver’s license. Discuss with your physician and local DMV.

Prevention

Since PNES often arises from underlying psychological stress, primary prevention focuses on early identification and treatment of risk factors.

• Early trauma screening in pediatric and primary‑care settings.
• Prompt mental‑health referral after major life stressors.
• Education for healthcare providers to differentiate PNES from epilepsy, reducing misdiagnosis.
• Stress‑management programs in schools and workplaces.
• Regular follow‑up for patients with known psychiatric disorders to monitor for functional neurological symptoms.

Complications

If left untreated, PNES can lead to significant physical, psychological, and social complications.

• Unnecessary antiepileptic medication – exposure to side‑effects (e.g., bone loss, liver toxicity) without benefit.
• Injury – falls or self‑inflicted harm during episodes.
• Psychiatric comorbidity escalation – depression, suicidality, substance abuse.
• Social and occupational impairment – stigma, loss of employment, strained relationships.
• Healthcare costs – repeated emergency visits, unnecessary imaging, and hospital admissions. One US study estimated an average annual cost of $12,000 per patient before accurate diagnosis.<sup>[10]</sup>

When to Seek Emergency Care

References

1. World Health Organization. “Global prevalence of psychogenic nonepileptic seizures.” WHO Neurology Bulletin, 2022.
2. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, 5th ed. (DSM‑5). 2013.
3. Reuber M, et al. “Psychogenic nonepileptic seizures in epilepsy centers.” Epilepsia. 2020;61(3):417‑425.
4. Garcia‑Sanchez R, et al. “Epidemiology of functional neurological disorders.” Neurology. 2021;96(9):456‑463.
5. Hirsch LJ, et al. “Misdiagnosis of epilepsy and psychogenic nonepileptic seizures.” Neurology. 2017;89(20):2100‑2108.
6. Benbadis SR, et al. “Psychiatric comorbidities in PNES.” Cleveland Clinic Journal of Medicine. 2019;86(11):817‑824.
7. Lancet D, et al. “Impact of education on PNES outcomes.” JAMA Neurology. 2022;79(4):452‑459.
8. Goldstein LH, et al. “Cognitive‑behavioral therapy for psychogenic seizures: a randomized trial.” Neurology. 2020;94(6):e654‑e664.
9. Sharpe G, et al. “Multidisciplinary clinic for functional seizures improves remission.” Brain. 2023;146(2):517‑527.
10. García‑Barrera P, et al. “Healthcare utilization and costs before and after PNES diagnosis.” Health Economics. 2021;30(8):1540‑1552.

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