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Table 3 Results duplex assessmenta

From: Prevalence of venous obstructions in (recurrent) venous thromboembolism: a case-control study

  Recurrent VTE
N = 32
No recurrent VTE
N = 24
Total
N = 56
Odds ratio (95%CI)
Extraluminal compression 4 (12.5) 3 (12.5) 7 (12.5) 1.00 (0.20–4.96)
Extraluminal compression, per vein segment
 ICVir 1 (3.1) 2 (8.3) 3 (5.6) 0.36 (0.03–1.16)
 CIV 4 (12.5) 3 (12.5) 7 (12.5) 1.00 (0.20–4.96)
 EIV 1 (3.1) 0 (0.0) 1 (1.8) 2.33 (0.09–59.8)
Post-thrombotic sequalaeb 28 (87.5) 18 (75.0) 46 (82.1) 2.33 (0.58–9.43)
Trabeculations, per vein segment
 ICVsr 1 (3.1) 0 (0.0) 1 (1.8) 2.33 (0.09–59.8)
 ICVir 1 (3.1) 1 (4.2) 2 (3.6) 0.74 (0.04–12.5)
 CIV 2 (6.3) 3 (12.5) 5 (8.9) 0.47 (0.07–3.04)
 EIV 3 (9.4) 3 (12.5) 6 (10.7) 0.72 (0.13–3.95)
 CFV 3 (9.4) 4 (16.7) 7 (12.5) 0.52 (0.10–2.57)
 FV 18 (56.3) 9 (37.5) 27 (48.2) 2.14 (0.73–6.32)
 DFV 1 (3.1) 1 (4.2) 2 (3.6) 0.74 (0.04–12.5)
 PV 27 (79.4) 16 (66.7) 43 (76.8) 2.70 (0.75–9.68)
Venous insufficiencyc 19 (59.4) 10 (41.7) 29 (51.8) 2.05 (0.70–6.00)
Venous insufficiency, per vein segment
 CFV 3 (9.4) 0 (0.0) 3 (5.6) 5.81 (0.29–118.1)
 PV 19 (59.4) 10 (41.7) 29 (51.8) 2.05 (0.70–6.00)
  1. Data are n (%)
  2. None of the variables mentioned in this table showed statistical significant difference between groups
  3. ICVsr Inferior caval vein, supra renal, ICVir Inferior caval vein, infra renal, CIV Common iliac vein, EIV External iliac vein, CFV Common femoral vein, FV Femoral vein, DFV Deep femoral vein, PV Popliteal vein, VTE Venous thrombo-embolism
  4. a During the standardized duplex ultrasound study assessment the presence of extraluminal compression and/or trabeculations was assessed per individual vein segment of the affected leg(s) being the ICVsr, ICVir, CIV, EIV, CFV, FV, DFV, and PV. Venous insufficiency was assessed in the CFV and PV
  5. bPost-thrombotic sequelae are defined as the presence of intraluminal trabeculations or synechiae
  6. cVenous insufficiency was defined as a retrograde flow longer than 1 s [16]