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Definition of the post-thrombotic syndrome, differences between existing classifications
D N Kolbach1, H A M Neumann, M H Prins
1Department of Epidemiology, University Maastricht, Maastricht, The Netherlands. dinanda.kolbach@epid.unimaas.nl
Summary
No single definition effectively diagnoses post-thrombotic syndrome (PTS) after deep vein thrombosis (DVT). This study compared five PTS definitions, finding significant variations in prevalence and severity grading, with no clear advantage for any single system.
Area of Science:
- Vascular Medicine
- Clinical Diagnosis
- Medical Informatics
Background:
- Established diagnostic criteria exist for deep vein thrombosis (DVT).
- A uniform definition for diagnosing and treating post-thrombotic syndrome (PTS) remains elusive.
- This study investigates various PTS definitions and their correlation with invasive venous pressure measurements.
Purpose of the Study:
- To evaluate and compare five distinct clinical definitions of post-thrombotic syndrome (PTS).
- To assess the relationship between these clinical definitions and invasive ambulatory venous pressure measurements.
- To determine if any single classification system offers a superior method for diagnosing PTS.
Main Methods:
- 124 patients with a history of DVT were clinically evaluated using five different PTS grading systems: Widmer, CEAP, Venous Clinical Severity Score (VCS), Prandoni, and Brandjes.
- Both lower limbs were assessed for PTS severity.
- Clinical scores were compared against invasive ambulatory venous pressure measurements.
Main Results:
- Prevalence of severe PTS in DVT legs ranged from 7% to 21%, compared to 0-4% in control legs.
- The Brandjes and VCS definitions tended to classify more legs as severe PTS.
- All tested clinical definitions showed a significant association with ambulatory venous pressure, but substantial overlap existed between clinical groups, indicating limitations in the reference standard.
Conclusions:
- All evaluated clinical definitions of PTS correlate with ambulatory venous pressure measurements.
- Significant differences were observed in how scoring systems discriminated between DVT and control legs, and in the reported prevalence of PTS.
- No single classification system demonstrated a clear advantage over the others for diagnosing PTS.