1. Treatment of iliac vein obstruction
George Geroulakos
Professor of Vascular Surgery, University of Athens,
Professor of Vascular Surgery, Imperial College, London

2. Surgical bypass for occluded iliac veins has now been largely replaced by endovenous stenting.

3. Iliac/ IVC vein stenting is a recent development
Many of the endovenous techniques that are used are based on prior arterial experience

4. Morphologic and pathologic features of venous lesions are different from those of arterial stenosis.
Modification of standard techniques used in the management of arterial stenosis is necessary to obtain best results in endovascular interventions in the venous system.

5. Definitions
It is not known at what degree venous stenosis is haemodynamically significant
Morphological obstruction >50% as measured by IVUS has arbitrarily been chosen for stenting.

6. Systemic review of endovenous stenting in chronic venous disease secondary to iliac vein obstruction.
Conclusion: The quality of evidence to support this is weak, with the main flaw being the lack of control groups to illustrate the observed benefits are not part of natural history progression of CVD.
Seager et al; Eur J Vasc Endovasc Surg 2016

7. Stenting for total occlusions of the iliac vein
In a 9 year period 167 limbs in 159 post-thrombotic patients with total chronic occlusions of the iliac vein were treated.
Technical success: 83%
Cumulative pain relief at 3 years: 79%
Cumulative swelling relief at 3 years: 66%
Ulcer healing at 33 months: 56%
Raju, J Vasc Surg 2009

8. Venous stenting across inguinal ligament
Arterial stenting is not recommended across the inguinal ligament because of increased risk of focal neointimal hyperplasia or compression/fracture.
Venous stents can safely be placed across the inguinal ligament with no effect on log term patency.

9. Venous stenting across inguinal ligament
177 limbs had stents placed in the iliofemoral venous outflow across the inguinal ligament into the common femoral vein. Results compared with outcomes of 316 limbs with stents terminating above inguinal ligament. Cumulative patency was similar for both groups (7% versus 11% respectively) Neglen, J Vasc Surg 2008

16. Reflux & Obstruction mL/s Venous filling index VFI = 90VV / VFT90
Venous drainage index
VDI = 90VDV/VDT90
mL/s

17. Josef Pflug Vascular Laboratory, Ealing Hospital & Imperial College
Venous drainage improves significantly after iliac stenting but this may result in faster venous filling
Lattimer CR Kalodiki E Azzam M Schnatterbeck P Geroulakos G
Josef Pflug Vascular Laboratory, Ealing Hospital & Imperial College
No Disclosures

18. Aim To assess the hemodynamic impact of stenting in
non-thrombotic iliac venous lesions (NIVLs)

19. Patients 14 iliac veins in 10 patients stented
C0=1; C3=1 C4a=4; C4b=3; C5=3; C6=2
13 NIVL, 1 iliac occlusion
VFI & VDI pre/post stenting
CTV minor diameter (% stenosis)
IVUS: >50% area reduction = stent

20. RESULTS - clinical improvement
All legs improved (except 1 symptomless leg)
VCSS pre: 11 (7-12) post: 5 (4-8) p=.001
Subjective
Softer in the ankle region
Lighter in colour in the ankle region
Lighter leg in weight/motion
Less swollen (10/14)
- Lack quantitative measurements

21. Pre – Post Stenting

22. CTV – VDI relationship

23. VDI predictive value

24. Iliac vein occlusion

25. Conclusion The VDI is responsive to stenting in NIVLs
Clinical uses of the VDI may include -
Screening for obstruction
Assessment of CVI patients without reflux
Assessment of PTS patients with reflux
Selection for stenting
Monitoring stents