Prothrombotic state in rheumatoid arthritis

Abstract

Aim. To study the indices of standard coagulogram and thrombodynamics test in native plasma and in the test with phospholipids in relation to the activity of rheumatoid arthritis (RA) and the ongoing therapy.Material and methods. We examined 28 patients with rheumatoid arthritis and eight age- and sex-matched healthy controls: 11 patients with high rheumatoid arthritis activity (DAS28>5.2) (Group 1), nine patients with low and moderate rheumatoid arthritis activity (DAS28<5.2) (Group 2) and eight rheumatoid arthritis patients receiving anticoagulants (Group 3). Results. Elevated fibrinogen was more common in the RA patient groups: 5/11(45%) in group 1, 3/9(33%) in group 2 and 3/8(38%) in group 3. In the control group, fibrinogen was normal, p><0.05. Increased SFMC was found in all patients in all three groups (100%) and only in 2 of the controls (25%), with p><0.05. Mean clot density was significantly higher in RA groups than in controls: 26811, 25437 and 24740 versus 20631 c.u. in groups 1, 2, 3 and control, respectively, p><0,01. In patients with anticoagulants, lag time (1.4 minutes) was longer than without anticoagulants (1.1-1.2 minutes), with p><0.05 in all cases. Spontaneous clots were detected only in patients: 3 in groups 1 and 1 each in groups 2 and 3. Hypocoagulation was detected only in group 3 in 1/8(12%) patients, and thrombotic readiness status was detected in groups 1 and 2: in 2/11(18%) and 1/9(11%) patients, respectively. The frequency of normal- and hypercoagulation did not differ between the patient and control groups. Conclusion. According to the thrombodynamics test, hypercoagulability is present in RA patients. Thrombodynamics test can be used to identify the risk of thrombosis and to individualize therapy in RA patients. Keywords: prothrombotic state, hypercoagulation, rheumatoid arthritis, thrombodynamics>˂ 5.2) (Group 2) and eight rheumatoid arthritis patients receiving anticoagulants (Group 3).Results. Elevated fibrinogen was more common in the RA patient groups: 5/11(45%) in group 1, 3/9(33%) in group 2 and 3/8(38%) in group 3. In the control group, fibrinogen was normal, p˂ 0.05. Increased SFMC was found in all patients in all three groups (100%) and only in 2 of the controls (25%), with p˂ 0.05. Mean clot density was significantly higher in RA groups than in controls: 26811, 25437 and 24740 versus 20631 c.u. in groups 1, 2, 3 and control, respectively, p˂ 0,01. In patients with anticoagulants, lag time (1.4 minutes) was longer than without anticoagulants (1.1-1.2 minutes), with p˂ 0.05 in all cases. Spontaneous clots were detected only in patients: 3 in groups 1 and 1 each in groups 2 and 3. Hypocoagulation was detected only in group 3 in 1/8(12%) patients, and thrombotic readiness status was detected in groups 1 and 2: in 2/11(18%) and 1/9(11%) patients, respectively. The frequency of normal- and hypercoagulation did not differ between the patient and control groups.Conclusion. According to the thrombodynamics test, hypercoagulability is present in RA patients. Thrombodynamics test can be used to identify the risk of thrombosis and to individualize therapy in RA patients.