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Validation of the LET classification.

R H W Strijkers1, C W K P Arnoldussen2, C H A Wittens3

  • 1Department of Vascular Surgery and Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, Maastricht, The Netherlands rob.strijkers@gmail.com.

Phlebology
|March 3, 2015
PubMed
Summary

The Limb Extensive Thrombus (LET) classification effectively predicts severe post-thrombotic syndrome in deep venous thrombosis patients. Extensive thrombus location (LET I, II, III) is linked to higher post-thrombotic syndrome risk and reduced quality of life.

Keywords:
Deep venous thrombosispost-thrombotic syndromequality of lifescoring system

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Area of Science:

  • Vascular Medicine
  • Thrombosis Research
  • Clinical Epidemiology

Background:

  • Acute thrombus removal may mitigate post-thrombotic syndrome (PTS) in deep venous thrombosis (DVT) patients.
  • The Limb Extensive Thrombus (LET) classification stratifies DVT patients by thrombus location and extent to predict PTS risk.
  • This study validates the LET classification's predictive utility for PTS in a DVT cohort.

Purpose of the Study:

  • To evaluate the LET classification's effectiveness in predicting post-thrombotic syndrome (PTS) development.
  • To assess the correlation between LET classes and disease-specific quality of life (QoL) in DVT patients.
  • To identify DVT patients at high risk for severe PTS for targeted interventions.

Main Methods:

  • A cohort of 660 DVT patients completed questionnaires assessing PTS (modified Villalta scale), QoL (VEINES-Sym/Qol), and confounders.
  • Thrombus extension data was used to assign patients to LET classes (I, II, III).
  • Statistical analysis included ANOVA and multiple logistic regression to compare PTS occurrence and QoL scores across LET classes.

Main Results:

  • Of 315 responders, 309 had a distilled PTS score.
  • LET classes I, II, III (n=63) showed an odds ratio of 3.4 for severe PTS; LET II (n=17) had an odds ratio of 5.1 compared to LET I (n=97).
  • Significantly lower VEINES-Sym and VEINES-Qol scores were observed for LET I, II, III and LET II compared to LET I.

Conclusions:

  • The LET classification accurately categorizes DVT patients based on acute thrombus characteristics.
  • Extensive and centrally located thrombi (LET I, II, III) are associated with a higher probability of severe PTS.
  • Patients with extensive DVT classified by LET I, II, III experience poorer disease-specific quality of life.