Abstract
Introduction. To compare the diagnostic values of laboratory variables, to present evaluations of the diagnostic test for asymmetric dimethyl arginine (ADMA), rheumatoid factor (RF), C-reactive protein (CRP), and DAS28 index, and to define the effect of untreated rheumatoid arthritis on endothelial function. In order to determine whether ADMA changes depending on the disease evolution, ADMA was used as an indicator for endothelial dysfunction. Methods. Using an ELISA technology of DLD-Diagnostika-GMBH for the detection of ADMA, the samples of serum and urine have been examined in 70 participants (35 RA who were not treated, 35 healthy controls). RF was defined with the test for agglutination (Latex RF test) in the same participants. Results. Out of 35 examined patients with RA, RF appeared in 17 patients (sensitivity of the test, 51.42%). In 20 of the 35 examined patients with RA, we found the presence of ADMA (sensitivity of the test, 57.14%). Anti-CCP antibody was present in 24 examined patients with RA (sensitivity of the test, 68.57%). Conclusion. ADMA has equal or very similar sensitivity and specificity to RF in untreated RA (sensitivity of 57.14% versus 48.57%, specificity of 88.57% versus 91.42%) in the detection of asymptomatic endothelial dysfunction in untreated RA.
Highlights
To compare the diagnostic values of laboratory variables, to present evaluations of the diagnostic test for asymmetric dimethyl arginine (ADMA), rheumatoid factor (RF), C-reactive protein (CRP), and DAS28 index, and to define the effect of untreated rheumatoid arthritis on endothelial function
In the patients examined for this study, the diagnosis of the disease was established on the basis of revised diagnostic criteria for the classification of rheumatoid arthritis, suggested in 1987 by the American Association for Rheumatism (ARA) [36]
Of all the examined patients with Rheumatoid arthritis (RA), ADMA is detected in 20 patients (57,14%), about acute phase reactant, RF was detected in 17 patients (48.57%), anti-cyclic citrulated peptides (CCPs) antibody in 23 patients (65.71%), CRP in 14 patients (40%), and sedimentation in 27 patients (77.14%)
Summary
To compare the diagnostic values of laboratory variables, to present evaluations of the diagnostic test for asymmetric dimethyl arginine (ADMA), rheumatoid factor (RF), C-reactive protein (CRP), and DAS28 index, and to define the effect of untreated rheumatoid arthritis on endothelial function. Rheumatoid arthritis (RA) is a disease which encompasses up to 1% of the whole population and is associated with an increased risk for onset and development of cardiovascular diseases (CVD). Data show that those patients have 30–60% increased risk for CVD in comparison with patients with osteoarthritis [1]. Circulatory markers of the systemic inflammation significantly increase the risk of cardiovascular morbidity and mortality in this group of patients, far more than traditional risk factors such as smoking, diabetes, and hypertension [3,4,5,6,7,8,9]. Endothelial dysfunction occurs in the Arthritis absence of manifest CVD and is not connected with traditional atherosclerotic risk factors [10,11,12]
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