Medical Condition

The recognition of PANDAS has significant implications for clinical practice, research, and public health. It highlights the intersection of infectious disease, immunology, and psychiatry, urging a paradigm shift in how pediatric neuropsychiatric symptoms are evaluated and treated. Families often face prolonged diagnostic journeys, and increasing awareness among healthcare providers is essential for timely diagnosis and management. Moreover, PANDAS exemplifies the need for interdisciplinary collaboration and targeted research to better understand post-infectious brain disorders in children.

PANDAS (Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections) is a clinical diagnosis characterized by the sudden onset of obsessive-compulsive symptoms and/or motor or vocal tics associated with an untreated Group A streptococcal (GAS) infection. Onset is abrupt and may be accompanied by separation anxiety, behavioral regression, eating restriction, emotional lability, sensory sensitivities, handwriting deterioration, and urinary frequency. These symptoms tend to follow a relapsing-remitting course, often correlating with exposure to infection. Even though the initial episode is associated specifically with GAS, subsequent exacerbations may be triggered by other bacterial and viral infections. The severity of symptoms range from mild to severe/life threatening.

At this time, actual prevalence is not known. PANDAS represents a subset of childhood-onset OCD. Familial clustering of autoimmune and neuropsychiatric disorders in some cases suggests a genetic predisposition, although specific susceptibility genes have not been conclusively identified. Research is ongoing to better characterize the genetic and immunologic profiles of affected individuals.

Neuropsychiatric symptoms in PANDAS are broad and may include OCD, anxiety, depression, irritability, emotional outbursts, and sleep disturbances. Motor abnormalities such as tics, choreiform movements, and hyperactivity are common. Neuroimaging and clinical findings suggest dysfunction in basal ganglia and related neural circuits, areas known to regulate emotion, movement, and executive function. These symptoms appear rapidly and can fluctuate in severity, typically worsening during periods of immune activation. The neuropsychiatric symptoms accompanying the OCD and/or tics may remit on their own timeline, separate from the primary symptoms.

The pathogenesis of PANDAS involves autoimmune neuroinflammation triggered by a misdirected immune response to streptococcal antigens. This is hypothesized to occur through molecular mimicry, where antibodies generated against GAS cross-react with neuronal antigens, particularly in the basal ganglia, a region implicated in movement and behavior regulation.

Animal models and serum analyses have demonstrated cross-reactive anti-neuronal antibodies, immune complex deposition, and blood-brain barrier compromise, supporting this mechanistic pathway. Additional immune dysregulation, including T-cell activation and cytokine imbalances, may further contribute to neuronal dysfunction.

Management of PANDAS involves a 3 pronged multi-disciplinary approach including both symptomatic and etiologic approaches. Antibiotic treatment aimed at eradicating streptococcal infection is needed. Depending on symptom severity, immunomodulatory interventions such as corticosteroids, intravenous immunoglobulin (IVIG), or plasma exchange may be considered. Cognitive-behavioral therapy (CBT) with exposure and response prevention (ERP) is recommended as part of the multi-component treatment plan.

A comprehensive, individualized treatment plan with input from neurology, psychiatry, and immunology is often necessary to address the multifaceted nature of the disorder.

The immunologic processes collectively contribute to the acute neuropsychiatric presentation and offer potential therapeutic targets for intervention. Key mechanisms implicated in PANDAS include:

• Molecular mimicry between streptococcal antigens and neuronal tissue
• Autoantibody-mediated dysfunction of basal ganglia circuits
• Neuroinflammation involving cytokine activation and microglial response
• Blood-brain barrier disruption, potentially facilitating immune cell entry
• Dysregulation of dopaminergic and glutamatergic neurotransmission

PANDAS represents a clinically distinct subset of pediatric neuropsychiatric disorders, characterized by the acute onset of OCD and/or tics associated with streptococcal infection. Its autoimmune pathophysiology distinguishes it from look alike psychiatric conditions and underscores the importance of recognizing infection-related neuroinflammation as a contributor to pediatric mental health disorders. Early identification and appropriate intervention may mitigate symptom severity and improve long-term outcomes.

Swedo, S. E., Leonard, H. L., Garvey, M., et al. (1998). Pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections: Clinical description of the first 50 cases. Am J Psychiatry, 155(2), 264–271.

Frankovich, J., Swedo, S., Murphy, T., et al. (2017). Clinical Management of Pediatric Acute-Onset Neuropsychiatric Syndrome: Part II—Use of Immunomodulatory Therapies. J Child Adolesc Psychopharmacol, 27(7), 574–593.

Singer, H. S., et al. (2015). Autoantibodies in Tourette syndrome, OCD, and PANDAS. J Child Neurol, 30(2), 174–179.

Dale, R. C., et al. (2005). Antibodies to basal ganglia in children with tic disorders. J Neurol Neurosurg Psychiatry, 76(1), 170–173.