Long-term integrity of 53 iliac vein stents after catheter-directed thrombolysis.

Background: Long-term surveillance data on venous stent integrity is sparse. There is limited knowledge on whether duplex ultrasound (DUS) can detect potential stent deformities such as kinking, straightening, and fracture, which may impact long-term patency of the stented veins.

Purpose: To assess venous stent integrity after at least five years of follow-up and to establish the efficacy of DUS as surveillance in patients with venous stent.

Evidence for Local Spots of Viscous Electron Flow in Graphene at Moderate Mobility.

Dominating electron-electron scattering enables viscous electron flow exhibiting hydrodynamic current density patterns, such as Poiseuille profiles or vortices. The viscous regime has recently been observed in graphene by nonlocal transport experiments and mapping of the Poiseuille profile. Herein, we probe the current-induced surface potential maps of graphene field-effect transistors with moderate mobility using scanning probe microscopy at room temperature.

Invited Review Article: Multi-tip scanning tunneling microscopy: Experimental techniques and data analysis.

In scanning tunneling microscopy, we witness in recent years a paradigm shift from "just imaging" to detailed spectroscopic measurements at the nanoscale and multi-tip scanning tunneling microscope (STM) is a technique following this trend. It is capable of performing nanoscale charge transport measurements like a "multimeter at the nanoscale." Distance-dependent four-point measurements, the acquisition of nanoscale potential maps at current carrying nanostructures and surfaces, as well as the acquisition of - curves of nanoelectronic devices are examples of the capabilities of the multi-tip STM technique.

Excellent long-term results with iliac stenting in local anesthesia for post-thrombotic syndrome.

Background: Only 20% of iliac veins will recanalize on anticoagulation (AC) treatment alone and may, therefore, develop venous obstruction after iliofemoral deep venous thrombosis (DVT). A considerable number of these patients will suffer from post-thrombotic syndrome (PTS) leading to impaired quality of life in more than 50%. Endovascular treatment for iliac vein obstruction using stents is known to alleviate PTS symptoms in selected patients.

Surface and Step Conductivities on Si(111) Surfaces.

Four-point measurements using a multitip scanning tunneling microscope are carried out in order to determine surface and step conductivities on Si(111) surfaces. In a first step, distance-dependent four-point measurements in the linear configuration are used in combination with an analytical three-layer model for charge transport to disentangle the 2D surface conductivity from nonsurface contributions. A termination of the Si(111) surface with either Bi or H results in the two limiting cases of a pure 2D or 3D conductance, respectively.

[Acute iliofemoral deep venous thrombosis should be treated with catheter-directed thrombolysis].

Treatment of acute iliofemoral deep venous thrombosis (DVT) with catheter-directed thrombolysis (CDT) has been performed in Denmark since 1999. The purpose of CDT is to dissolve thrombus and to restore the venous lumen as fast as possible and thereby save venous valve function and prevent postthrombotic syndrome. Danish studies have shown that treatment of acute iliofemoral DVT using CDT results in good patency, preserves venous valve function, reduces the frequency of PTS, and is associated with a higher quality of life.

Postthrombotic syndrome and quality of life in patients with iliofemoral venous thrombosis treated with catheter-directed thrombolysis.

Background: Postthrombotic syndrome (PTS) is a common complication after iliofemoral venous thrombosis, often resulting in poor quality of life (QOL) among the affected patients. This study assessed development of PTS and its effect on QOL among patients treated for iliofemoral venous thrombosis by catheter-directed thrombolysis.

Methods: Patients admitted with an iliofemoral venous thrombosis and treated with catheter-directed thrombolysis at Gentofte University Hospital from 1999 to 2008 were invited to participate.

Acute iliofemoral venous thrombosis in patients with atresia of the inferior vena cava can be treated successfully with catheter-directed thrombolysis.

Purpose: To assess the effectiveness and clinical outcomes of catheter-directed thrombolysis in patients with atresia of the inferior vena cava (IVC) and acute iliofemoral deep vein thrombosis (DVT).

Materials And Methods: From 2001 to 2009, 11 patients (median age, 32 y) with atresia of the IVC and acute iliofemoral DVT in 13 limbs were admitted for catheter-directed thrombolysis. Through a multiple-side hole catheter inserted in the popliteal vein, continuous pulse-spray infusion of tissue plasminogen activator and heparin was performed.

Flash pulmonary edema in patients with renal artery stenosis--the Pickering Syndrome.

Aim: We report the prevalence of flash pulmonary edema in patients consecutively referred for balloon angioplasty of uni- or bilateral renal artery stenosis (PTRA), and describe the characteristics of this special fraction of the patients. We further report two unusual cases.

Methods And Material: Review of medical records from 60 patients consecutively referred for uni- or bilateral PTRA from 2004-2005 in Copenhagen County.

Patient acceptance of whole-body magnetic resonance angiography: A prospective questionnaire study.

Background: Whole-body magnetic resonance angiography (WB-MRA) is a noninvasive method for diagnosing the systemic distribution of atherosclerosis. Numerous studies have demonstrated the feasibility and diagnostic performance of WB-MRA, but no studies have investigated patient acceptance of this imaging method.

Purpose: To measure patient acceptance of WB-MRA compared to the gold standard, digital subtraction angiography (DSA), in patients with peripheral arterial disease (PAD).

Whole-body magnetic resonance angiography with additional steady-state acquisition of the infragenicular arteries in patients with peripheral arterial disease.

The purpose of this investigation was to determine if addition of infragenicular steady-state (SS) magnetic resonance angiography (MRA) to first-pass imaging improves diagnostic performance compared with first-pass imaging alone in patients with peripheral arterial disease (PAD) undergoing whole-body (WB) MRA. Twenty consecutive patients with PAD referred to digital-subtraction angiography (DSA) underwent WB-MRA. Using a bolus-chase technique, first-pass WB-MRA was performed from the supra-aortic vessels to the ankles.

Dilatation of aortic grafts over time: what to expect and when to be concerned.

Dilatation of aortic prosthetic grafts is commonly reported, but most reports are anecdotal, with little objective data in the literature. We performed a prospective trial of 303 patients who underwent prosthetic graft repair for aortic aneurysm or occlusive disease, randomizing patients between insertion of a woven polyester or expanded polytetrafluoroethylene (ePTFE) graft. Patients were followed with computed tomography and ultrasonography for up to 5 years in order to assess the frequency and magnitude of postoperative dilatation.

Whole-body magnetic resonance angiography at 3 tesla using a hybrid protocol in patients with peripheral arterial disease.

The purpose of this study was to determine the diagnostic performance of 3T whole-body magnetic resonance angiography (WB-MRA) using a hybrid protocol in comparison with a standard protocol in patients with peripheral arterial disease (PAD). In 26 consecutive patients with PAD two different protocols were used for WB-MRA: a standard sequential protocol (n = 13) and a hybrid protocol (n = 13). WB-MRA was performed using a gradient echo sequence, body coil for signal reception, and gadoterate meglumine as contrast agent (0.

[A hybrid approach to surgery for thoracic aortic aneurysm].

A 57-year-old male, previously treated surgically with insertion of grafts for type A and B aortic dissection, presented with a pulsatile mass in the jugular fossa. Further examination verified a pseudoaneurysm the inlet of which was located at the proximal anastomotic site of the descending aortic graft and a newly developed aneurysm of the aortic arch. Using a left lateral thoracotomy to avoid manipulation of the pseudoaneurysm, we adopted a hybrid approach by first debranching the subclavian and carotid arteries from the descending aorta followed by endoluminal grafting of the aortic arch.

[Modern treatment of type B dissections].

Rapid classification is essential in the management of aortic dissections, as Type A dissections require surgery, while the optimal treatment of Type B dissections is controversial. Medical treatment with antihypertensive medication and analgesics has so far been the main treatment of uncomplicated Type B dissections, while surgery has been reserved for complications and persistent pain in spite of medical treatment. Endovascular techniques are less invasive than open repair and show promising early results.

[Bilateral deep venous thrombosis and vena cava aplasia treated with local thrombolysis].

In this case report the treatment of a young man with bilateral iliaco-femoral DVT and vena cava aplasia is presented. The patient was treated with catheter-directed thrombolysis; the catheters were introduced in the thrombus of both legs via v. popliteae.

[Endovascular treatment of chronic iliac vein obstruction in patients with venous claudication].

Introduction: Proximal deep venous thrombosis (DVT) often leads to venous outflow obstruction in chronic venous insufficiency (CVI). This paper presents our clinical experience with iliac vein stent placement.

Materials And Methods: Between January 2001 and November 2004 balloon dilation and stent placement for the relief of iliac vein obstruction was intended in ten patients suffering from venous claudication.

[Subintimal angioplasty of long femoropopliteal artery occlusions].

Introduction: Subintimal angioplasty is a newer method in the treatment of lower extremity atherosclersosis. This paper reports the results of our first experiences with long (>10 cm) femoropopliteal artery occlusions.

Materials And Methods: In the period from July 1999 to July 2003, 28 patients were treated with subintimal angioplasty.

[Local thrombolysis in proximal deep venous thrombosis of the lower extremity].

Introduction: Deep venous thrombosis (DVT) often leads to chronic venous insufficiency and the present study was conducted in order to investigate the effectiveness of catheter-directed thrombolysis in patients with proximal DVT of the lower extremity (iliac vein involved), with respect to recanalisation and maintenance of venous valve function.

Material And Methods: A prospective clinical investigation was carried out with puncture of the popliteal vein for continuous infusion of r-alteplase. Twelve patients suffering from recent proximal DVT were treated: In 10 patients the left extremity was affected, in two the right.