Cases That Test Your Skills

Seizure-like episodes, but is it really epilepsy?

Current Psychiatry. 2019 August;18(8):42-47

References

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Although NES is a common type of conversion disorder, it is often difficult to diagnose, manage, and treat. Patients often receive antiepileptic medications but continue to have worsening events that are refractory to treatment. Various clinical features can suggest NES instead of epilepsy. Forced eye closure on video recording is a specific finding suggestive of NES, yet this feature is not sufficient to make the diagnosis.⁴ A video EEG must be performed to assess for epilepsy. The diagnosis of NES does not exclude the possibility that a patient has epilepsy, as NES can occur in up to 40% of patients with epilepsy.⁵ A video EEG without ictal patterns before, during, and after an observed episode is diagnostic of NES.⁶

The authors’ observations

Conversion disorders such as NES are a presentation of neurologic symptoms that cannot be readily accounted for by other conditions and are often associated with antecedent trauma. Multiple factors in Ms. N’s history increase her risk of NES, including loss of multiple loved ones, ongoing legal involvement, and alleged sexual abuse by her father.

Victims of sexual abuse are more likely than the general population to demonstrate symptoms of conversion disorder, especially NES.^7,8 The onset of paroxysmal episodes after incestuous abuse in a teenage girl is characteristic of NES. Compared with patients with complex partial epilepsy (CPE), patients with NES are 3 times more likely to report sexual trauma.^9,10 Children who report sexual abuse that precedes NES are more likely to have been victimized by a first-degree relative than patients with CPE who report sexual abuse.¹¹ Risk factors for victims developing NES may be related to the severity of adversity, stress sensitivity, and decreased hippocampal volume.^12,13

Ms. N endorsed many psychiatric symptoms that accompany her paroxysmal episodes; this is similar to findings in other patients with NES._¹⁴ One study found that depression is 3 times more prevalent and PTSD is 8 times more prevalent in patients with NES.¹² During the evaluation, Ms. N’s mother said her daughter had low energy, poor appetite, lethargy, and anhedonia for the preceding 5 months, which is consistent with adjustment disorder._³ Her flashbacks, nightmares, difficulty sleeping, and agoraphobia, along with her trouble engaging with the people and activities that used to bring her joy, are symptoms of PTSD. Nonepileptic seizure is often associated with PTSD and can be viewed as an expression of a dissociated subtype.¹⁵

In a literature review, Durrant et al¹⁶ isolated prognostic indicators for NES (Table¹⁶). This study found that 70% of children and 40% of adults achieve remission from NES. Ms. N’s case has multiple concerning features, such as her comorbid psychiatric conditions, ongoing involvement in a legal case, and sexual trauma; this last factor is associated with the most severe symptoms and worse outcomes.^16,17 Despite this somber reality, Ms. N has the support of her mother and is relatively young, which play a vital role in recovery.