Background Coeliac disease (CD) is an autoimmune disease caused by exposure to gluten in genetically predisposed individuals. The detection of anti-transglutaminase IgA (tTG) and anti-endomysial (EMA) is used for screening of CD with sensitivity and specificity of 90% and 99%. The association between CD and connective tissue diseases (CTD) has been reported.
Objectives The objective was to describe the frequency of IgA tTG and EMA in patients with definite diagnosis of CTD and inflammatory arthropathies (IA).
Methods Patients ≥18 years with CTD and IA were included. Values of ≥20 for tTG (ELISA) and ≥10 for EMA (IIF) were considered positive. Medium were used for numeric variables and interquartile percentages for categorical variables. Confidence intervals were calculated for 95%.
Results Of 149 patients with various diagnoses included, 8 had at least one positive antibody (5.37% CI =1.75-8.99), 6 had both (4.03% CI =0.87-7,18) and 2 had only tTG. Eight patients were diagnosed with CD and biopsy was performed in 4 (see table below). In this study 5.37% presented positive serology for CD. Positive antibodies were found in patients with Sjögren's syndrome, rheumatoid arthritis, psoriatic arthritis, polymyositis and lupus, as reported by other authors.
Conclusions According to our findings, it would be useful to perform a serological screening for CD in CTD, due to the overlap of autoimmune diseases, as well as in undifferentiated arthritis, to determine in those patients in whom the small bowel biopsy should be performed for definitive diagnosis.
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Disclosure of Interest : None declared