Epilepsy affects over 3 million Americans, characterized by seizures stemming from abnormal electrical activity in the brain. However, a distinct group of individuals experience seizures that are not rooted in this electrical dysfunction. These events, known by various terms including functional seizures, psychogenic seizures, nonepileptic seizures, or historically, the stigmatizing "pseudoseizures," have long been understood as a complex response to significant mental stressors such as anxiety and post-traumatic stress disorder. Now, groundbreaking research from Michigan Medicine is shedding new light on these often-misunderstood episodes, revealing that functional seizures are associated with observable structural changes in the brain detectable through magnetic resonance imaging (MRI).
This pivotal study, published in the esteemed journal Epilepsy & Behavior, analyzed a substantial dataset of over 650 clinical-grade MRIs. The research team meticulously compared brain scans from individuals diagnosed with functional seizures against those of individuals who did not experience seizures but who might have had other mental health conditions, including depression, anxiety, and obsessive-compulsive disorder (OCD). The findings represent a significant leap forward in understanding the neurobiological underpinnings of functional seizures, moving beyond a purely psychological explanation to identify concrete, measurable differences in brain structure.
Identifying Distinct Brain Structures Associated with Functional Seizures
The Michigan Medicine researchers discovered that patients experiencing functional seizures exhibited specific structural alterations in key areas of the brain. Notably, they observed thinning in the superior temporal cortex, a region critical for cognitive awareness and the volitional control of one’s actions. Simultaneously, these individuals showed increased thickness in the left occipital cortex, an area responsible for processing visual information and other sensory input. These specific patterns of cortical thickness were absent in the control group comprising individuals with depression, anxiety, and OCD, suggesting a unique neurobiological signature for functional seizures.
Dr. Wesley Kerr, the study’s lead author and a neurologist and epileptologist at University of Michigan Health, articulated the profound implications of these findings. "If we can figure out what brain changes make people have functional seizures, we can begin to look at how we can change that back," he stated. This sentiment underscores the potential for developing targeted interventions. Currently, the primary treatment for functional seizures is cognitive behavioral-informed therapy, which, while beneficial for some, is not universally effective. Dr. Kerr’s hope is that understanding these structural differences will pave the way for novel therapeutic strategies aimed at reducing seizure frequency and significantly improving the quality of life for affected individuals.
The Peril of Misdiagnosis: A Long and Harmful Road
One of the most significant challenges in managing functional seizures has been their timely and accurate identification. The current diagnostic odyssey for many patients is lengthy and fraught with misdirection. On average, individuals with functional seizures are misdiagnosed and treated for epilepsy for nearly nine years before receiving a correct diagnosis. This prolonged period of misidentification can lead to substantial harm, both physically and psychologically.
"The misdiagnosis can cause real harm to patients," emphasized Dr. Kerr, who also serves as a clinical instructor of neurology at U-M Medical School. He further elaborated on the detrimental effects of inappropriate treatment. "During the years before people are accurately diagnosed with functional seizures, 80% of them were prescribed anti-seizure medications used to treat epilepsy. Those medications have side-effects, including fatigue and dizziness. These people can also come into the ER with prolonged seizures and end up being intubated and given high doses of medication, which can be lifesaving for someone with epilepsy but is both not needed and dangerous for functional seizures."
The implications of this misdiagnosis extend to healthcare utilization and cost. Patients receiving incorrect treatments often experience recurrent emergency room visits for prolonged seizures, leading to unnecessary interventions and substantial financial burdens. Furthermore, the psychological toll of being misunderstood and receiving ineffective treatment can exacerbate underlying mental health conditions.
Differentiating Between Epileptic and Nonepileptic Seizures: A Diagnostic Dilemma
Distinguishing between epilepsy, with its hallmark electrical abnormalities, and functional seizures is a complex clinical task. Diagnosing epilepsy typically relies on a combination of seizure history, seizure type, and diagnostic testing, most notably the electroencephalogram (EEG), which monitors brain electrical activity. However, the diagnostic landscape is not always clear-cut. Approximately half of individuals with known focal epilepsy exhibit normal EEG readings, complicating definitive diagnosis.
Moreover, the urgency of diagnosing and treating epileptic seizures cannot be overstated. Untreated or delayed treatment of epileptic seizures can lead to permanent brain damage or even death. This critical distinction creates a challenging scenario for clinicians when faced with uncertainty. "In those cases, people tend to give high doses of seizure medication if they are not sure," Dr. Kerr explained. "And around 10% of people who come in with what we think is status epilepticus are actually having prolonged functional seizures." Status epilepticus, a life-threatening condition characterized by prolonged or recurrent seizures without recovery of consciousness, requires immediate and aggressive intervention. The fact that a significant portion of these presentations are actually functional seizures highlights the critical need for improved diagnostic accuracy.
While observing or hearing about a seizure can provide valuable clinical information, obtaining an EEG is a standard next step. However, as mentioned, EEGs can be inconclusive. Relying solely on clinical observation and EEG can leave room for diagnostic ambiguity. Dr. Kerr noted, "We would always like to have the EEG and MRI information to back up what we see in the patient clinically, but we still need to see the seizure to diagnose functional seizures reliably." This underscores the multifaceted nature of diagnosis, often requiring a synthesis of various clinical and diagnostic data.
The Future of Diagnosis: MRI as a Biomarker
The current study by Michigan Medicine offers a promising pathway toward earlier and more accurate diagnosis by introducing structural MRI as a potential biomarker for functional seizures. The identification of distinct cortical thickness patterns could lead to a paradigm shift in how these conditions are identified. By incorporating these MRI findings into the diagnostic process, clinicians may be able to differentiate between epilepsy and functional seizures more effectively, even in the absence of definitive EEG results or when seizures are not directly observed.
"But once we diagnose someone with functional seizures, we can reduce the high health care utilization they have from coming into the ER often and having to pay a lot for anti-seizure medications to improve their quality of life," Dr. Kerr stated. Early and accurate diagnosis is not merely an academic pursuit; it has direct and tangible benefits for patients, leading to appropriate treatment, reduced healthcare costs, and a significantly improved quality of life.
Nicholas J. Beimer, M.D., a co-author of the study and a clinical assistant professor of neurology and psychiatry at U-M Medical School, echoed this sentiment. "We know that early, accurate diagnosis of functional seizures is essential to starting treatment that will improve quality of life," he said. "This work is an example of how we can look more carefully at the tests we already perform, like a standard MRI of the brain, for subtle clues that lead us to the correct diagnosis. I look forward to how this research will be used to improve our diagnostic speed and accuracy, so that we can get our patients with functional seizures to the right treatment sooner."
Broader Implications and the Road Ahead
The implications of this research extend beyond improved diagnostic capabilities. By identifying structural brain changes, the study opens new avenues for understanding the neurobiological mechanisms underlying functional seizures. This understanding could, in turn, lead to the development of novel therapeutic interventions, potentially including pharmacological treatments or more targeted psychotherapies that address the specific neurobiological vulnerabilities observed.
The historical perception of functional seizures as purely psychological phenomena has contributed to stigma and a lack of adequate research and funding. This study, by providing objective, measurable evidence of structural brain differences, has the potential to destigmatize these conditions and foster greater empathy and understanding from healthcare providers and the public alike.
The ongoing research at Michigan Medicine signifies a crucial step in bridging the gap between neurological and psychological explanations for these complex seizure disorders. As advancements in neuroimaging technology continue to evolve, the role of MRI in unraveling the mysteries of the brain, and in particular in differentiating conditions that manifest with similar symptoms but have distinct underlying causes, will undoubtedly become even more critical. This work is a testament to the power of interdisciplinary research, combining neurological expertise with insights from psychiatry and psychology, to offer hope and tangible improvements in the lives of millions affected by seizure disorders. The journey from understanding to effective treatment is often long, but this latest discovery marks a significant milestone on that path, promising a future where functional seizures are diagnosed earlier, treated more effectively, and where the stigma associated with them begins to fade.