Stiff Person Syndrome: Clinical Spectrum, Diagnosis, and Management

Stiff-person syndrome (SPS) is a rare autoimmune neurological disorder primarily defined by muscle rigidity and painful spasms caused by impaired inhibitory neurotransmission. This comprehensive review details how the condition often involves antibodies against glutamic acid decarboxylase (GAD) and can manifest in various forms, ranging from classical stiffness to complex spectrum disorders that overlap with epilepsy or ataxia. Because early symptoms are frequently mistaken for psychiatric issues or other movement disorders, the authors emphasize the necessity of specialized antibody testing and electromyography for an accurate diagnosis. Management typically relies on a combination of GABA-ergic medications, such as diazepam and baclofen, alongside immunotherapies like intravenous immunoglobulin (IVIG) to modulate the immune response. Clinical outcomes vary, but the text highlights that early intervention and structured monitoring via tools like the BRIT questionnaire are vital for preventing long-term disability. Ultimately, the source provides a comprehensive framework for clinicians to recognize, diagnose, and treat the diverse phenotypes of this challenging disease.