Vascular dysfunction in juvenile idiopathic arthritis: a systematic review and meta-analysis.

We performed a systematic review and meta-analysis of studies evaluating vascular function in patients with JIA. Relevant literature published from 1st January 1965 to 1st March 2022 was searched systematically utilizing PubMed, Web of Science, and Embase databases. Observational studies were included-patients with JIA (classified according to the International League of Associations for Rheumatology criteria) were included as cases (study population) and age/sex-matched healthy participants as controls (comparator group). Outcome measures were differences in non-invasive parameters of vascular function. Online Population, Intervention, Comparison, Outcomes Portal was used for deduplication of studies and data extraction. Review Manager, Comprehensive Meta-analysis, and Meta-Essential softwares were used for data synthesis/analysis (encompassing data pooling and evaluation of heterogeneity and publication bias). Newcastle-Ottawa Scale and GRADEpro GDT software were utilized to assess study quality and certainty of evidence, respectively. Of 338 citations, 17 observational studies with 1423 participants (cases = 757, controls = 666) were included. Carotid intima-media thickness (CIMT) was higher [mean difference (MD) 0.02 mm {95% confidence interval (CI) 0.01-0.04}, p = 0.0006, I 2  = 69%] in patients with JIA. Besides, decreased flow-mediated dilatation (FMD) [MD - 2.18% {95%CI - 3.69- - 0.68}, p = 0.004, I 2  = 73%] was also observed. Results of studies assessing pulse wave velocity or arterial stiffness could not be pooled due to significant methodological variations. A 'very low' certainty of evidence suggests the presence of vascular dysfunction in JIA. Future longitudinal studies are required to determine whether altered CIMT and FMD in patients with JIA translate to an enhanced risk of (adverse) clinical cardiovascular events. PROSPERO (CRD42022323752).