Author/Editor		Perdan-Pirkmajer, Katja; Žigon, Polona; Boc, Anja; Podovšovnik, Eva; Čučnik, Saša; Mavri, Alenka; Rotar, Žiga; Ambrožič, Aleš
Title		The predictive value of the aCL and anti-[beta]2GPI at the time of acute deep vein thrombosis - a two-year prospective study
Type		članek
Vol. and No.		Letnik 9, št. 8
Publication year		2021
Volume		str. 1-10
ISSN		2227-9059
Language		eng
Abstract		Antiphospholipid syndrome (APS) is an important cause of deep vein thrombosis (DVT). According to current APS classification criteria, APS cannot be confirmed until 24 weeks after DVT. This time frame results in frequent discontinuation of anticoagulant treatment before APS is diagnosed. Therefore, the aim of our study was to evaluate the potential predictive value of anticardiolipin (aCL) and anti-[beta]2glycoprotein I (anti-[beta]2GPI) before discontinuation of anticoagulation therapy. Patients with newly diagnosed DVT were included into a 24-month prospective study. All patients received anticoagulant therapy. aCL and anti-[beta]2GPI were determined at inclusion and every four weeks for the first 24 weeks and then one and two years after inclusion. APS was confirmed in 24/221 (10.9%) patients. At the time of acute DVT 20/24 (83.3%), APS patients had positive aCL and/or anti-[beta]2GPI. Two patients had low aCL levels and two were negative at the time of acute DVT but later met APS criteria due to lupus anticoagulant (LA). Our data indicate that negative aCL and/or anti-[beta]2GPI at the time of acute DVT make further aPL testing unnecessary; however, LA should be determined after discontinuation of anticoagulant therapy. Positive aCL and/or anti-[beta]2GPI at the time of acute DVT have a strong positive predictive value for APS and may support therapeutic decisions.
Keywords		thrombosis antiphospholipid syndrome antiphospholipid antibodies tromboza antifosfolipidni sindrom antifosfolipidna protitelesa