Definition of post-thrombotic syndrome of the leg for use in clinical investigations: a recommendation for standardization


Susan R. Kahn, Division of Internal Medicine, Center for Clinical Epidemiology and Community Studies, Jewish General Hospital, McGill University, 3755 Cote Ste. Catherine Rm. A-114, Montréal, QC, H3T 1E2, Canada.
Tel.: +1 514 340 7587; fax: +1 514 340 7564.


Summary.  The post-thrombotic syndrome (PTS) is increasingly recognized to be a common and important complication of deep venous thrombosis (DVT). Because there is no ‘gold standard’ objective test to establish its presence, PTS is diagnosed primarily on the basis of the presence of typical symptoms and clinical signs in a limb that was affected by DVT. As a wide variety of definitions of PTS have been used by researchers, it is difficult to compare data across studies and to formally combine data in meta-analyses. In a step towards standardization of the measurement of PTS in clinical studies, available scales and evidence to support their utility to diagnose PTS and to classify its severity were reviewed and discussed at the Control of Anticoagulation Subcommittee of the International Society on Thrombosis and Haemostasis (Vienna, July 2008).