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Thirty FMF patients and 30 healthy controls were enrolled in this cross-sectional study. Disease features and quality of life were recorded using the Familial Mediterranean Fever Quality of Life Scale (FMF-QoL). The Composite Autonomic Symptom Score-31 (COMPASS-31), Hospital Anxiety and Depression Scale (HADS), Fatigue Severity Scale (FSS), Jenkins Sleep Scale (JSS), and Fibromyalgia Rapid Screening Tool (FiRST) were noted. Parasympathetic nervous system was evaluated by R-R interval variability (RRIV) during normal and deep breathing and 30:15 ratio tests with electromyography, while the sympathetic nervous system was assessed by sympathetic skin response (SRR), blood pressure response to standing and sustained handgrip tests. FMF patients had higher total median COMPASS-31 scores than controls (15.09 vs. 5.12,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.001), with significantly higher secretomotor, gastrointestinal, bladder, and pupillomotor subdomain scores (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05). RRIV during normal breathing was lower in the FMF group compared with controls (17.29 vs. 21.27,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.015). No between-group differences were observed in sympathetic function tests (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&gt;\u20090.05). In correlation analyses, RRIV during normal breathing correlated negatively with CRP (\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u2009\u2212\u20090.378,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.04). Sympathetic parameters showed negative correlations with CRP (left plantar SSR latency:\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u2009\u2212\u20090.398,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.03; blood pressure response to handgrip:\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u2009\u2212\u20090.405,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.026) and with annual attack frequency (left plantar SSR amplitude:\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u2009\u2212\u20090.449,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.01). Total COMPASS-31 scores correlated with FMF-QoL (\n                    <jats:italic>r<\/jats:italic>\n                    \u2009&gt;\u20090.5,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), HADS-anxiety (\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u20090.550,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.002), HADS-depression (\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u20090.633,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), FSS (\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u20090.600,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), JSS (\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u20090.705,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), and FiRST (\n                    <jats:italic>r<\/jats:italic>\n                    \u2009=\u20090.598,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001). FMF patients showed predominant parasympathetic dysfunction, while sympathetic findings were limited to correlations suggesting possible subclinical involvement. These autonomic alterations may contribute to reduced quality of life and associated symptoms such as fatigue, depression, and sleep disturbance.\n                  <\/jats:p>","DOI":"10.1007\/s00296-026-06076-6","type":"journal-article","created":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T12:04:29Z","timestamp":1770206669000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Autonomic dysfunction and its associations with clinical parameters in Familial Mediterranean Fever: a cross-sectional study"],"prefix":"10.1007","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9376-7232","authenticated-orcid":false,"given":"\u0130mran","family":"Kalkan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8790-304X","authenticated-orcid":false,"given":"Halise Hande","family":"Gezer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3584-2788","authenticated-orcid":false,"given":"Mehmet Tuncay","family":"Duru\u00f6z","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,2,4]]},"reference":[{"issue":"10","key":"6076_CR1","doi-asserted-by":"publisher","first-page":"1447","DOI":"10.1002\/art.24458","volume":"61","author":"E Ben-Chetrit","year":"2009","unstructured":"Ben-Chetrit E, Touitou I (2009) Familial mediterranean fever in the world. 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However, we used an AI-based tool solely for language refinement purposes. All AI-generated text was carefully reviewed, edited, and verified by the authors to ensure accuracy and appropriateness.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Acknowledge AI use"}},{"value":"Accepted at the ACR Congress 2023, Kalkan I, Duru\u00f6z MT, AB0032 ASSESSMENT OF AUTONOMIC DYSFUNCTION AND ITS RELATIONS WITH CLINICAL PARAMETERS IN FAMILIAL MEDITERRANEAN FEVER (FMF), Annals of the Rheumatic Diseases 2024;83:1241\u20131242.\n                      \n                      .","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Related Congress abstract"}}],"article-number":"41"}}