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AB0577 Mean Platelet Volume is Associated with Behcet's Disease Activity

Background Mean platelet volume (MPV) has been known to be a marker of platelet activity and influenced by inflammation.The correlations of MPV with disease activities were reported in several rheumatic diseases such as rheumatoid arthritis, ankylosing spondylitis, and psoriasis. However MPV is controversial as a marker of their disease activities. Furthermore, the association of MPV with disease activity in Behcet's disease (BD) is not determined yet. Objectives The aim of this study is to investigate the association of MPV with clinical manifestations and disease activity in BD. Methods We sequentially retrieved data on 193 patients with BD who visited to our rheumatic clinic from 1999 to 2013 by reviewing of medical records. BD was diagnosed according to International Criteria for BD. The data on demographics, clinical manifestations, and laboratory results including MPV, erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) were collected. Active BD was defined as it needed prednisolone of more than 0.5 mg/kg/day or to add immunosuppressive agents. Infection was demonstrated by culture or clinical improvement with antibiotic treatment. Statistical analysis was made by t-test and Pearson's correlation. A value of p<0.05 was considered as statistically significant. Results The ratio of female to male was 2:1 and the age of symptom onset was 32.2±11.1 years. The age at diagnosis of BD was 40.9±10.0 years and the follow-up duration was 4.7±3.8 years. Fifty-one patients (26.4%) had major organ involvements such as eye (17.6%), gastrointestinal (7.8%), vascular (4.7%) and nervous system (3.1%). MPV at diagnosis was 8.2±1.2 fl. MPV was not related with clinical manifestations, ESR and CRP. During follow-up, 79 patients had active BD and 12 patients had infections such as pulmonary tuberculosis and pyelonephritis. MPV in active BD (8.1±1.4 fl) was lower than that in inactive disease (8.9±1.3 fl; (p<0.0001). MPV significantly increased when the patients were infected (9.5±1.6 fl; p<0.0001) Conclusions MPV was not related with clinical manifestations of BD. However, there was an association of active BD with lower MPV and of infection with higher MPV. Thus, MPV level may be used as a marker of BD activity and to differentiate infection from active BD. References Are platelet volume indices of clinical use? A multidisciplinary review. Ann Med. 2012 Dec;44(8):805-16. Mean platelet volume in recurrent aphthous stomatitis and behcet disease. Angiology. 2014 Feb;65(2):161-5. Increased mean platelet volume in Behçet's disease with thrombotic tendency. Tohoku J Exp Med. 2010 Jun;221(2):119-23. Disclosure of Interest None declared DOI 10.1136/annrheumdis-2014-eular.5121