{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,1]],"date-time":"2026-11-01T11:46:37Z","timestamp":1793533597665,"version":"4.5.0"},"reference-count":69,"publisher":"American Medical Association (AMA)","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Netw Open"],"abstract":"Importance<\/jats:title>Epidemiologic studies indicate a high rate of autoimmune conditions among patients with obsessive-complusive disorder and other psychiatric conditions. Furthering the understanding of the inflammatory diatheses of psychiatric conditions may open doors to new treatment paradigms for psychiatric disorders.<\/jats:p><\/jats:sec>Objectives<\/jats:title>To evaluate whether pediatric acute-onset neuropsychiatric syndrome (PANS) is associated with an inflammatory diathesis by assessing signs of immune activation and vasculopathy during a psychiatric symptom exacerbation (flare), estimating the risk of developing arthritis and other autoimmune diseases, and characterizing subtypes of arthritis.<\/jats:p><\/jats:sec>Design, Setting, and Participants<\/jats:title>This retrospective cohort study used longitudinal clinical data on 193 consecutive patients with PANS followed up within the Stanford Immune Behavioral Health Clinic from September 1, 2012, to December 31, 2021.<\/jats:p><\/jats:sec>Main Outcomes and Measures<\/jats:title>Medical records were reviewed, and a predefined set of immune markers that were measured during a flare and the features and imaging findings of arthritis and other autoimmune diseases were collected. Immune activation markers included (1) autoimmunity signs (antinuclear antibody, antihistone antibody, antithyroglobulin antibody, C1q binding assay, and complement levels [C3 and C4]); (2) immune dysregulation or inflammation signs (leukopenia, thrombocytosis, C-reactive protein, and erythrocyte sedimentation rate); and (3) vasculopathy signs (livedo reticularis, periungual redness and swelling, abnormally prominent onychodermal band, palatal petechiae, high von Willebrand factor antigen, and high d<\/jats:sc>-dimer). Last, the cumulative risk of developing arthritis and autoimmune diseases was estimated using product limit (Kaplan-Meier) survival probability.<\/jats:p><\/jats:sec>Results<\/jats:title>The study included data from 193 children (112 boys [58.0%]) who had PANS at a mean (SD) age of 7.5 (3.5) years. They were followed up for a mean (SD) of 4.0 (2.1) years. Among those tested for immune activation markers, 54.2% (97 of 179) had nonspecific markers of autoimmunity, 12.0% (22 of 184) had nonspecific signs of immune dysregulation or inflammation, and 35.8% (69 of 193) had signs of vasculopathy. By 14 years of age, the estimated cumulative incidence of arthritis was 28.3% (95% CI, 20.8%-36.3%), and the estimated cumulative incidence of another autoimmune disease was 7.5% (95% CI, 4.0%-12.4%). Novel findings in the subgroup with arthritis include joint capsule thickening (55.0% [22 of 40]), distal interphalangeal joint tenderness (81.8% [45 of 55]), and spinous process tenderness (80.0% [44 of 55]). Among the 55 patients with arthritis, the most common subtypes of arthritis included enthesitis-related arthritis (37 [67.3%]), spondyloarthritis (27 [49.1%]), and psoriatic arthritis (10 [18.2%]).<\/jats:p><\/jats:sec>Conclusions and Relevance<\/jats:title>This study found that patients with PANS show signs of immune activation and vasculopathy during psychiatric symptom flares and have an increased risk of developing arthritis and other autoimmune diseases compared with the general pediatric population. The most common arthritis subtype was enthesitis-related arthritis. These findings suggest that PANS may be part of a multisystem inflammatory condition rather than an isolated psychiatric or neuroinflammatory disorder.<\/jats:p><\/jats:sec>","DOI":"10.1001\/jamanetworkopen.2024.21688","type":"journal-article","created":{"date-parts":[[2024,7,30]],"date-time":"2024-07-30T15:32:46Z","timestamp":1722353566000},"page":"e2421688","source":"Crossref","is-referenced-by-count":25,"title":["Development of Autoimmune Diseases Among Children With Pediatric Acute-Onset Neuropsychiatric Syndrome"],"prefix":"10.1001","volume":"7","author":[{"given":"Meiqian","family":"Ma","sequence":"first","affiliation":[{"name":"Division of Allergy, Immunology, & Rheumatology, Department of Pediatrics, Stanford University School of Medicine, Palo Alto, California"},{"name":"Stanford Immune Behavioral Health Clinic and Research Program at Lucile Packard Children\u2019s Hospital, Palo Alto, California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erin 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