Dimensional disparity between duplex and intravascular ultrasound in the assessment of iliac vein stenosis.

Minimum iliac vein caliber necessary to maintain normal peripheral venous pressure can be derived by the Poiseuille equation. Duplex was compared to intravascular ultrasound (IVUS) in the assessment of iliac vein stenosis in this single center retrospective study. Parallel IVUS and duplex caliber data for common iliac vein (CIV) and external iliac vein (EIV) in 382 limbs were separately compared.

Elevated plasma factor VIII levels in a mixed patient population on anticoagulation and past venous thrombosis.

Background: Thrombophilia conditions are associated with an increased risk of venous thromboembolism. Elevated plasma levels of factor VIII (>150 IU/dL) increase the risk of venous thrombosis. The aim of this report is to analyze a subset of patients in whom plasma factor VIII levels were investigated as part of a thrombophilia panel at a specialty venous clinic at a tertiary care hospital.

An alternative explanation for the phasic variations in venous flow.

Background: Phasic venous flow variation with respiration is surrounded by controversy and not well understood. The current concept assigns a major role to the "abdominal pump." According to this model, inspiratory increases in abdominal pressure compress the vena cava, increasing its internal venous pressure and propelling blood upstream.

Long-term outcomes following use of a composite Wallstent-Z stent approach to iliofemoral venous stenting.

Objective: An endovascular approach has essentially replaced open surgery in the management of symptomatic chronic obstructive iliofemoral venous disease. In the last several years, such a minimally invasive approach has shifted from use of Wallstents alone to a combination of Wallstent-Z stent (composite stenting) to better deal with the iliocaval confluence. This study evaluates the clinical and stent related outcomes following use of composite stenting.

The two-segment caliber method of diagnosing iliac vein stenosis on routine computed tomography with contrast enhancement.

Background: Iliac vein stenosis is a frequent pathologic process in advanced chronic venous disease. Intravascular ultrasound (IVUS) has emerged as the "gold standard" to diagnose iliac vein stenosis and to guide stent treatment. A pre-IVUS test is often obtained.

Contralateral limb improvement after unilateral iliac vein stenting argues against simultaneous bilateral stenting.

Objective: Symptoms of chronic venous insufficiency secondary to obstructive iliofemoral disease are often bilateral. The impact of iliofemoral stenting of the more symptomatic lower extremity on clinical outcomes in the less affected contralateral extremity is not clear. Such benefit, secondary to offloading of collaterals, may potentially be of the magnitude that the contralateral extremity does not require intervention.

Impact of Presence of Inferior Vena Cava Filter on Iliocaval Stent Outcomes.

Background: The impact of presence of an IVC filter in patients undergoing stenting for symptomatic femoroiliocaval obstruction has not been explored in detail. This study attempts to fill this gap by evaluating clinical and stent-related outcomes in such patients. The incidence of deep vein thrombosis (DVT) in this setting is also analyzed.