Acute ischemia secondary to popliteal artery stent fracture and embolization.

Femoropopliteal disease comprises more than one half of lesions in peripheral vascular disease. The treatment modalities for stenosis or occlusion of this anatomic region include femoropopliteal bypass and percutaneous transluminal angioplasty with or without stenting. Our patient developed acute leg ischemia 3 years after stenting, secondary to stent fracture, with distal embolization of stent fragments. Using mechanical thromboembolectomy and superficial femoral artery to below-the-knee popliteal in situ saphenous vein bypass, we were able to restore perfusion to the limb and retrieve fragments of the fractured stent.

Project PROMIS: Peoria Regional Outpatient Medical Imaging Study.

BACKGROUND: Abdominal aortic aneurysm (AAA) accounts for > 15,000 reported deaths annually. Early screening in high-risk populations is important to decrease morbidity and mortality from rupture. METHODS: A prospective, population-based study of free ultrasound-based AAA screening was conducted from July 2004 to December 2006. Before examination, subjects completed surveys asking their medical history, including known AAA risk factors. Incidence rates and comparison analyses were performed. RESULTS: The final analysis included 979 patients, of whom AAA was discovered in 27 (2.8%). AAA was found in only male patients > 60 years old (4% of the male population). AAA size ranged from 3 to 10 cm. Of patients diagnosed with AAA, 85% were current or past smokers, and 70% had hypercholesterolemia. There was a 6% incidence of AAA in male smokers > or = 60 years old who had hypercholesterolemia. CONCLUSIONS: Four factors were predominant in our population of patients with AAA: patient age, male sex, smoking history, and hypercholesterolemia.

Intravascular ultrasound-guided bedside placement of inferior vena cava filters.

Pulmonary emboli in a critically ill patient population is an occurrence that may be reduced with appropriate utilization of inferior vena cava (IVC) filters. Complications both during transfer or transport of critically ill patients who are dependent upon multiple intravenous drips, ventilators and intensive monitoring may be reduced with bedside placement of inferior vena cava filters. Over the last decade, investigators have been developing techniques for bedside IVC filter placement based on intravascular ultrasound techniques. We discuss and detail a single venous access technique of IVC filter placement using intravascular ultrasound.

Vena cava filters: why, when, what, how?

Pulmonary emboli, a potentially lethal venous thromboembolic complication, is a potentially preventable morbidity or mortality that surgeons should consider in the perioperative period or in high-risk patients. Prophylactic inferior vena cava (IVC) filter placement offers a high protection rate against fatal pulmonary emboli. This manuscript discusses the indications for filter placement, different types of currently available IVC filters, and problems and complications of filter placement and vena cava filters. Optional or retrievable IVC filters are also discussed. Overall, individual patient's clinical risks and benefits should be considered before vena cava filter placement. The new generation of optional filters may offer clinicians a new option of temporal risk reduction without the long-term complications that can be associated with permanent IVC filters.

Carotid revascularization in the presence of contralateral carotid artery occlusion is safe and durable.

OBJECTIVE: Complete occlusion of the contralateral carotid artery has been thought to increase the risk of carotid endarterectomy (CEA). This study was conducted to determine whether contralateral occlusion (CO) leads to a higher rate of complications among patients undergoing CEA or alters long-term outcomes. METHODS: All CEAs (N = 221) performed at our institution between September 1997 and June 2002 were reviewed. Patients were divided into two groups, i.e., CO and contralateral patency. Statistical analyses were performed using Fisher's exact test for nominal values and the t test for continuous variables. Life-table analyses were performed for patency and survival. RESULTS: Complete data and follow-up results were available for 170 of the 221 operations performed during the study period. CO was present in 16 cases (9.4%). Preoperative demographic features, indications for surgery, and operative techniques did not vary between study groups; there was increased use of general anesthesia (p = 0.05) in the CO group. No surgical deaths occurred. The perioperative stroke rates were not statistically different between groups (CO group, 6.3%; contralateral patency group, 2.6%; p = 0.39). Long-term patency and stroke-free survival rates at 5 years exceeded 90% and did not vary significantly between groups. CONCLUSION: Patients undergoing CEA with occlusion of the contralateral carotid artery do not have unique preoperative demographic features or indications. Contralateral carotid artery occlusion does not increase risk or alter long-term outcomes after CEA. Carotid revascularization can be safely performed in tertiary military centers.

Delayed paraplegia following infrarenal abdominal aortic endograft placement: case report and literature review.

The treatment of abdominal aortic aneurysms (AAAs) has changed over the past 12 years, with increased numbers of endovascular procedures being performed. Early morbidity is decreased following endovascular abdominal aortic aneurysm repair (EVAR) compared with open repair, and long-term studies of EVAR have focused on freedom from death, rupture, and conversion to open repair. Other less commonly encountered complications of EVAR are rarely reported. For instance, spinal cord ischemia (SCI) is a devastating complication infrequently seen after open AAA repair. This report discusses a case of delayed paraplegia after EVAR and reviews the pertinent literature. The incidence of SCI after EVAR is similar to open repair, but the mechanisms may be different. Atheroembolization and occlusion of pelvic inflow appear to be the predominant etiologies for SCI after EVAR. Careful consideration of the potential for SCI should be made in elderly patients undergoing EVAR, particularly if difficult arterial anatomy is present.

Endovascular repair of a spontaneous carotid artery dissection with carotid stent and coils.

Dissection of the internal carotid artery is an under-recognized cause of transient ischemic attack and cerebral vascular accident. Spontaneous dissections, in which no precipitating cause can be identified, occur infrequently. Endovascular intervention is an evolving treatment option in patients in whom anticoagulation therapy alone is not adequate, who are not suitable candidates for major surgery, or who have extremely distal dissections that are difficult to access. We report a case of successful endovascular stenting and coil application in a patient with spontaneous dissection of the distal cervical internal carotid artery with extension to its petrous portion and an accompanying pseudoaneurysm at the level of the skull base.

Treatment of a late-appearing proximal type-1 endoleak after Ancure graft with an AneuRx cuff--a case report.

The authors describe the case of a patient who developed a type-1 proximal endoleak 10 months after Ancure stent graft placement, despite the lack of stent migration or measurable neck dilatation. The patient had been under observation for a persistent type-2 endoleak and was noted to have an increase in his aneurysm size. The use of an uncovered stent was unsuccessful, and he required a covered proximal extension cuff. This led to a resolution of the endoleak. Implications in terms of surveillance and possible etiologies are discussed.

Graft patency is not the only clinical predictor of success after exclusion and bypass of popliteal artery aneurysms.

PURPOSE: The traditional measure of success after exclusion and bypass of popliteal artery aneurysm (PAA) is graft patency. In addition to fate of the bypass, we hypothesize that late outcome after surgical treatment of PAA is influenced by completeness of exclusion. METHODS: Thirty patients who underwent 41 reconstructions for PAA over a 10-year period were reviewed. RESULTS: Excluded PAAs were examined with duplex ultrasound scan for size, patency, and patent feeding branches; bypass grafts and native inflow and outflow arteries were examined for patency and size. Thirty-six limbs were available for follow-up (mean follow-up period, 46 +/- 42 months). Only two aneurysms (5.6%) appeared patent on duplex ultrasound scan, but five limbs had patent arterial branches communicating with thrombosed excluded PAAs. PAA diameter decreased from 2.5 +/- 0.8 cm to 1.7 +/- 0.5 cm (P <.0001) in most. However, 12 excluded PAAs (33%) showed significant enlargement from 2.2 +/- 0.9 cm to 2.8 +/- 1.0 cm (P =.002). A quarter of enlarging excluded PAA were associated with new compressive symptoms. Three methods of PAA exclusion were used: proximal and distal ligation with short segment isolation (type 1), proximal and distal ligation with long segment isolation (type 2), and single ligature (type 3). In univariate analysis, type of exclusion significantly influenced late size of excluded PAA (P =.004). Type 1 exclusion was superior to both type 2 and 3 exclusions in producing aneurysm diameter reduction. Type 3 exclusion resulted in aneurysm growth. In addition, excluded aneurysms with visualized feeding branches were associated with significant growth compared with PAAs without feeding branches (P =.006). Graft primary and assisted primary patency rates at 5 years were 86% +/- 9.4% and 92% +/- 7.4%, respectively. Although graft diameter and native donor artery diameter significantly increased, this did not adversely affect graft patency. CONCLUSION: Enlargement of excluded PAA after surgical treatment can cause compressive symptoms. Exclusion requires adequate vascular isolation to prevent late PAA enlargement, with proximal and distal arterial ligation best performed adjacent to the aneurysm. Vein graft enlargement occurs, but this enlargement does not adversely influence patency.

Successful endovascular therapy of a penetrating zone III internal carotid injury.

Penetrating injuries to the internal carotid artery in zone III of the neck can be a significant challenge to the operating surgeon. Direct surgical exposure and repair of the internal carotid artery at the skull base can be extremely difficult, and surgical options for treatment of a pseudoaneurysm at this location are limited. We present a case of an 18-year-old man who sustained a single gunshot wound to the distal cervical internal carotid artery that led to a pseudoaneurysm managed with endovascular exclusion. Recent literature on the surgical and endovascular management of distal carotid injuries is reviewed.

Cross-sectional magnetic resonance angiography is accurate in predicting degree of carotid stenosis.

Carotid stenosis is currently estimated using methods based on flow velocity or two-dimensional projection images. Manipulation of magnetic resonance (MR) images in three dimensions (3-D MR) allows for direct measurement of carotid artery cross-sectional luminal area. The objectives of this study were (1) to assess the accuracy of 3-DMR as a technique for estimating carotid artery stenosis, and (2) to compare 3-D MR results with estimates from duplex ultrasound sonography (DUS) and conventional angiography. Twenty-nine patients underwent rapid, contrast-enhanced MRA within 1 month prior to carotid endarterectomy to obtain 3-D angiographic images of the carotid bifurcation. From these data, post-processing software was used to generate a longitudinal axis through the center of the vessel along which orthogonal cross-sectional images were taken. Luminal area measurements at the location of tightest stenosis and the distal normal internal carotid artery were obtained and used to calculate percent area stenosis. Applying the same procedure, 18 en bloc, ex vivo carotid plaques served as the standard against which we compared in vivo 3-D MR measurements at the location of tightest stenosis. Percent stenosis comparisons between MRA, angiography, and duplex ultrasound were also made. Our results showed that the measurement of luminal area by 3-DMR is accurate in predicting the degree of carotid stenosis. Direct measurement of luminal area may overcome limitations inherent to methods that rely on flow velocities and two-dimensional views of the carotid vasculature. A larger prospective study is necessary to confirm the reliability of this technique.