Artritis reumatoidea juvenil y espondiloartropatias: estudio comparative

Abstract

Juvenile rheumathoid arthritis and espondUoarthropaties: a comparative study To identify early differential diagnostic criteriae berween both disease enlities, 75 patients under 16 years of age with juvenile rheumatoid arthritis (JRA, n:40| or ankylosing spondylitis [JAS, n:35) were retrospectively studied and compared by sex., age, nutritional state, joint localization, blood cell counts, erithrocyte sedimentation rate, serum rheumatoid factor, antinuclear antibodies and HLA B27 at clinical onset. Significant differences [p < 0.05 unless otherwise stated) were found for sex yRA 60% females, JAS 62.8% males), weight for age under 10th percenfile (JRA 43%, JAS 20%), age at onset under six years (JRA 46%, JAS 5.7%, p < 0.01), incidences of anemia URA 61.5%, JAS 41.1 %), leukocytosis [|RA 46,1 %, JAS 20.5%), neutrophilia URA 61.5%, JAS 17.6%), thrombocitosis [JRA 28.2%, JAS 2.9/o|, and in localization of initial joint involvement QRA: large and small peripheral joints, JAS: lower limbs and axial joints). Positive HLA B27 results were obtained in 47% of JAS patients an only 5%> of JRA cases. This clinical and epidemiological differences coJd help, at the onset of clinical manifestations, to make more accurate differential diagnosis between JRA and JAS patients.