Editor's Choice - Reconstruction of the femoro-ilio-caval outflow by percutaneous and hybrid interventions in symptomatic deep venous obstruction.

OBJECTIVE/BACKGROUND: Deep venous obstruction is relatively prevalent in patients with chronic venous disease. Endovascular treatments and hybrid interventions can be used to relieve venous outflow obstructions. This paper assesses mid-term clinical outcomes and patency rates in a large cohort after percutaneous and hybrid interventions. METHODS: This was a prospectively analysed cohort study. Patients with symptomatic deep venous obstruction who presented at a tertiary referral hospital were divided into three groups: patients who underwent percutaneous stenting for non-thrombotic iliac vein compression syndrome (IVCS group); patients with post-thrombotic syndrome (PTS) treated by percutaneous stent placement (P-PTS group); and PTS patients with obstruction involving the veins below the saphenofemoral junction in which a hybrid procedure was performed, combining stenting with open surgical disobliteration (H-PTS group). Patency rates, complications, and clinical outcomes were analysed. RESULTS: A total of 425 lower extremities in 369 patients were treated. At 60 months, primary patency, assisted primary patency, and secondary patency rates were 90%, 100%, and 100% for IVCS, and 64%, 81%, and 89% for the P-PTS group, respectively. The H-PTS group, showed patency rates of 37%, 62%, and 72%, respectively, at 36 months. Venous claudication subsided in 90%, 82%, and 83%, respectively. At the 24 month follow-up, mean Venous Clinical Severity Score decreased for all patients and improvement in Villalta score was seen in post-thrombotic patients. The number of complications was related to the extent of deep venous obstruction in which patients in the H-PTS group showed the highest complication rates (81%) and re-interventions (59%). CONCLUSION: Percutaneous stent placement to treat non-thrombotic iliac vein lesions, and post-thrombotic ilio-femoral obstructions are safe, effective, and showed patency rates comparable with previous research. Patients with advanced disease needing a hybrid procedure showed a lower patency rate and more complications. However, when successful, the clinical outcome was favourable at mid-term follow-up and the procedure may be offered to selected patients.

Validation of the LET classification.

INTRODUCTION: Acute thrombus removal therapies may reduce post-thrombotic syndrome in certain deep venous thrombosis patients. The LET classification is designed to identify patients at high risk for developing post-thrombotic syndrome in the acute phase using thrombus location and extent. This study evaluates the use of the LET classification to predict post-thrombotic syndrome in a cohort of patients after deep venous thrombosis. METHODS: A cohort of 660 deep venous thrombosis patients was invited to participate and fill out a questionnaire with Quality of life questionnaires, basic information, a modified self-assessment version of the Villalta scale for post-thrombotic syndrome and potential confounders. Original data on thrombus extension was available, and the LET classes were determined. Obtained information was analysed using ANOVA and in a multiple logistic regression model to correct for confounders. All different LET classes were compared to post-thrombotic syndrome occurrence, post-thrombotic syndrome prediction and disease specific quality of life scores (VEINES-Sym/Qol). RESULTS: Three hundred and fifteen patients responded, and in 309 a post-thrombotic syndrome score was distilled. LET I,II,III (n = 63) had an odds ratio of 3.4(1.2-9.2) for predicting severe post-thrombotic syndrome, and LET II (n = 17) had an odds ratio of 5.1(1.3-20.8) compared to LET class I (n = 97). Both the VEINES-Sym and VEINES-Qol score were significantly lower for LET I,II,III compared to LET I, and LET II compared to LET I. CONCLUSION: The LET classification can be used to classify patients according to acute thrombus location and extent. Extensive and centrally located (LET I,II,III) deep venous thrombosis showed the highest probability in developing severe post-thrombotic syndrome and lower disease specific quality of life.

Diagnostic imaging of pelvic congestive syndrome.

Many female patients are affected by chronic pelvic pain and a significant number of referrals to the gynecology department result in a clinical suspicion of pelvic congestion syndrome. Additionally, patients referred to the vascular surgery department for venous disease can also present with complaints of a persistent dull lower abdominal pain in addition to typically distributed leg varicosities (that extend from the leg through the pelvic floor) which should be evaluated for the presence of pelvic congestion syndrome. In this article, we focus on imaging pelvic vein insufficiency and related (extending) varicosities: how should we evaluate the pelvic veins, what are the signs to look for, and what are the currently established criteria for (pre-interventional) imaging.

Venous in-stent thrombosis treated by ultrasound accelerated catheter directed thrombolysis.

OBJECTIVE/BACKGROUND: Stent placement in the venous system is an increasingly used treatment modality in chronic venous obstruction and as additional treatment after thrombolytic therapy in ilio-femoral deep vein thrombosis (DVT). Experience in treating in-stent thrombosis with ultrasound accelerated catheter directed thrombolysis (UACDT) is reported. METHODS: A retrospective analysis of patients treated for venous stent occlusion, after percutaneous transluminal angioplasty (PTA) and stent placement for either chronic venous occlusive disease or persistent vein compression in patients with acute DVT was performed. Duration of occlusion and suspected clot age were assessed using patient complaints and typical findings on duplex ultrasonography (DUS). DUS and venography were used to assess patency and to determine the cause of re-occlusion. Acute treatment of occlusion was by UACDT. Additional procedures included PTA, stent placement, and creation of an arteriovenous (AV) fistula. RESULTS: Eighteen patients (median age 43 years; 67% male), treated for occluded stent tracts with UACDT between January 2009 and July 2014, were identified. Indications for initial stenting were treatment of chronic venous obstructive disease (12 patients) and treatment of underlying obstruction after initial thrombolysis in acute DVT (six patients). Technical success was achieved in 11/18 (61%) patients. Primary patency in 8/11 patients was 73% at last follow up (median follow up 14 months [range 0-41 months]). Additional treatments after successful lysis were re-stenting (seven patients) and creation of an AV fistula (six patients). CONCLUSION: Treatment with UACDT of recently occluded stent tracts is feasible and effective. Recanalization of the stent tract can be achieved in most cases. Additional interventions were frequently used after successful UACDT treatment. Suboptimal stent positioning caused the majority of the stent occlusions.

Indications for endophlebectomy and/or arteriovenous fistula after stenting.

Endovenous recanalization with percutaneous transluminal angioplasty and stenting in post-thrombotic syndrome patients with iliocaval obstruction is a treatment modality quickly gaining popularity. Studies show good patency and clinical success rates. If the obstruction extends distally, below the inguinal ligament, stenting remains controversial. Without adequate inflow, the patency of stented iliocaval segments drops dramatically. This suggests that treatment of diseased common femoral, femoral and profunda femoral veins is required to ensure adequate inflow. Endophlebectomy, the removal of synechiae and septae from the common femoral vein, is a viable option in these cases. Another option, which can be done concurrently with the endophlebectomy, is the creation of an arteriovenous fistula. Selecting patients for these interventions however remains difficult, as precise preoperative prediction of inflow into the stented segments is difficult. In this paper we describe our experience in using duplex ultrasonography, magnetic resonance venography and conventional venography to assess the patency of the inflow trajectory. We believe this approach is essential in dealing with cases of complex post-thrombotic disease extending below the inguinal ligament. There is a great need to establish criteria to accurately assess pre- and postinterventional flow through treated vein segments.

Value of magnetic resonance venography and computed tomographic venography in lower extremity chronic venous disease.

For the treatment of chronic venous disease (CVD) of the lower extremity, identification of the underlying venous pathologies is essential. Traditionally, the pathologies to detect with imaging have been centred on insufficiency and reflux of the superficial, perforator and deep veins of the leg. More recently, stenosis and obstruction of the deep veins of the pelvis and abdomen (i.e. inferior vena cava, common and external iliac veins) have been identified as significant underlying pathologies in CVD. Accurate detection of stenotic and/or occlusive venous disease expands the treatment options for patients with CVD. In most cases, imaging of venous disease is performed with duplex ultrasound. In this article we discuss the existing evidence and potential value of computed tomographic venography and magnetic resonance venography to contribute in accurately identifying chronic venous disease, in particular chronic venous obstruction.

An imaging approach to deep vein thrombosis and the lower extremity thrombosis classification.

In this article we want to discuss the potential of lower extremity deep vein thrombosis (DVT) imaging and propose a systematic approach to DVT management based on a DVT classification of the lower extremity; the LET classification. Identifying and reporting DVT more systematically allows for accurate stratification for initial patient care, future clinical trials and appropriate descriptions for natural history studies.

A novel scoring system for lower-extremity venous pathology analysed using magnetic resonance venography and duplex ultrasound.

OBJECTIVES: To present a novel scoring system for lower-extremity venous pathology (the LOVE score) and our experiences using it in our clinical practice to identify venous pathology with duplex ultrasound (DUS) and magnetic resonance venography (MRV). METHOD: A total of 40 patients, 30 suspected of chronic venous disease and 10 with acute deep vein thrombosis (DVT) were examined from the inferior vena cava (IVC) to the popliteal vein using DUS and MRV. The image findings were reported using the LOVE score. RESULTS: The majority of deep veins (368 out of 378 segments) were completely visualized by both our imaging techniques and could be analysed using the LOVE score. Both imaging techniques reported comparable findings with regard to the visualization of thrombus, obstruction, collaterals, trabeculations, anatomic variations and central venous compression (e.g. May-Thurner). CONCLUSIONS: The LOVE score can be used to expand and standardize the documentation of imaging the deep venous system beyond thrombosis, to help identify (optimal) treatment options in patients with venous disease, in both the clinical and research setting. This first assessment shows that both DUS and MRV are capable of systematically identifying a multitude of changes in the venous system.