Experience With Unfavorable Iliac Access When Performing Fenestrated/Branched Endovascular Aneurysm Repair.

PURPOSE: To review a single-center experience with fenestrated and branched endovascular aneurysm repair (f/bEVAR) in patients with challenging iliac anatomies. MATERIALS AND METHODS: A retrospective review of the department's database identified 398 consecutive patients who underwent complex endovascular repair f/bEVAR between January 2010 and June 2018; of these, 67 had challenging accesses. The strategies implemented to overcome access issues were reviewed, using a dedicated scoring system to evaluate the access (integrating diameter, tortuosity, calcification, and previous open or endovascular repair). RESULTS: In this subgroup of patients, the most common graft design was a 4-vessel fenestrated endograft (27, 40.3%). Hostile access was due to small diameter (<7 mm) in 25 patients (37.3%) and/or concentric calcifications in 19 patients (26.9%). Mean iliac diameter was 5.5±2.6 mm on the right side and 6.0±2.5 mm on the left side. Previous open or endovascular aortoiliac repair had been performed in 15 patients (22.4%), and 20 patients (29.9%) had a stent previously implanted in at least 1 iliac artery, resulting in the inability to perform standard fenestrated repair with access from both sides. Five patients (7.5%) had a single patent iliac access. Eight distinctive strategies were identified to overcome these access issues, including the use of preloaded renal catheters in the endograft delivery system, angioplasty, graft modification (branches instead of fenestrations or 4 preloaded fenestrations), a conduit via a retroperitoneal approach, iliac artery recanalization, and/or the multiple puncture technique. Technical success was achieved in 62 cases (92.5%). Four patients had access complications and 1 died in the early postoperative period of multiorgan failure. Median follow-up was 24.6 months (IQR 7.2, 41.3). Clinical success at the end of follow-up was achieved in 57 patients (85.1%). During follow-up, 14 patients died, including 4 from an aorta-related cause. CONCLUSION: Dedicated strategies can be implemented to overcome hostile iliac access in patients with complex aneurysms when f/bEVAR is required. Typically, these maneuvers are associated with favorable outcomes.

Women undergoing endovascular thoracoabdominal aortic aneurysm repair differ significantly from their male counterparts preoperatively and postoperatively.

OBJECTIVE: A rational approach to the management of aortic aneurysm disease relies on weighing the risk of aneurysm rupture against the complications and durability of operative repair. In men, seminal studies of infrarenal aortic aneurysm disease and its endovascular management can provide a reasoned argument for the timing and modality of surgery, which is then extrapolated to the management of thoracoabdominal aortic aneurysms (TAAAs). In contrast, there is less appreciation for the natural history of TAAA disease in women and its response to therapy. METHODS: We used a retrospective cohort design of women, all men, and matched men, fit for complex endovascular thoracoabdominal aneurysm repair at two large aortic centers. We controlled for preoperative anatomic and comorbidity differences, and assessed technical success, postoperative renal dysfunction, spinal ischemia, and early mortality. Women and matched men were reassessed at follow-up for long-term durability and survival. RESULTS: Assessing women and all men undergoing complex endovascular aortic reconstruction, we demonstrate that these groups are dissimilar before the intervention with respect to comorbidities, aneurysm extent, and aneurysm size; women have a higher proportion of proximal Crawford extent 1, 2, and 3 aneurysms. Matching men and women for demographic and anatomic differences, we find persistent elevated perioperative mortality in women (16%) undergoing endovascular thoracoabdominal aneurysm repair compared with matched men (6%); however, at the 3-year follow-up, both groups have the same survival. Furthermore, women demonstrate more favorable anatomic responses to aneurysm exclusion, with good durability and greater aneurysm sac regression at follow-up, compared with matched men. CONCLUSIONS: Women and unmatched men with TAAA disease differ preoperatively with respect to aneurysm extent and comorbidities. Controlling for these differences, after complex endovascular aneurysm repair, there is increased early mortality in women compared with matched men. These observations argue for a careful risk stratification of women undergoing endovascular thoracoabdominal aneurysm treatment, balanced with women's good long-term survival and durability of endovascular aneurysm repair.

A prospective observational trial of fusion imaging in infrarenal aneurysms.

OBJECTIVE: Use of three-dimensional fusion has been shown to significantly reduce radiation exposure and contrast material use in complex (fenestrated and branched) endovascular aneurysm repair (EVAR). Cydar software (CYDAR Medical, Cambridge, United Kingdom) is a cloud-based technology that can provide imaging guidance by overlaying preoperative three-dimensional vessel anatomy from computed tomography scans onto live fluoroscopy images both in hybrid operating rooms and on mobile C-arms. The aim of this study was to determine whether radiation dose reduction would occur with the addition of fusion imaging to infrarenal repair in all imaging environments. METHODS: All patients who consented to involvement in the trial and who were treated with EVAR in our center from March 2016 until April 2017 were included. A teaching session about radiation protection and Cydar fusion software use was provided to all operators before the start of the fusion group enrollment. This group was compared with a retrospective cohort of patients treated in the same center from March 2015 to March 2016, after a dedicated program of radiation awareness and reduction was introduced. Ruptured aneurysms and complex EVAR were excluded. Preoperative and perioperative characteristics were recorded, including parameters of radiation dose, such as air kerma and dose-area product. Results were expressed in median and interquartile range. RESULTS: Forty-four patients were prospectively enrolled and compared with 21 retrospective control patients. No significant differences were found in comparing sex, body mass index, and age at repair. The median operation time (wire to wire) and fluoroscopy time were 90 (75-105) minutes and 30 (22-34) minutes, respectively, without significant differences between groups (P = .56 and P = .36). Dose-area product was nonsignificantly higher in the control group, 21.7 (8.9-85.9) Gy cm2, compared with the fusion group, 12.4 (7.5-23.4) Gy cm2 (P = .10). Air kerma product was significantly higher in the control group, 142 (61-541) mGy, compared with 82 (51-115) mGy in the fusion group (P = .03). The number of digital subtraction angiography runs was significantly lower in the fusion group (8 [6-11]) compared with the control group (10 [9-14]); (P = .03). There were no significant differences in the frequency of adverse events, endoleaks, or additional procedures required. CONCLUSIONS: When it is used in simple procedures such as infrarenal aneurysm repair, image-based fusion technology is feasible both in hybrid operating rooms and on mobile systems and leads to an overall 50% reduction in radiation dose. Fusion technology should become standard of care for centers attempting to maximize radiation dose reduction, even if capital investment of a hybrid operating room is not feasible.

Accuracy of implementing principles of fusion imaging in the follow up and surveillance of complex aneurysm repair.

Fusion imaging is standard for the endovascular treatment of complex aortic aneurysms, but its role in follow up has not been explored. A critical issue is renal function deterioration over time. Renal volume has been used as a marker of renal impairment; however, it is not reproducible and remains a complex and resource-intensive procedure. The aim of this study is to determine the accuracy of a fusion-based software to automatically calculate the renal volume changes during follow up. In this study, computerized tomography (CT) scans of 16 patients who underwent complex aortic endovascular repair were analysed. Preoperative, 1-month and 1-year follow-up CT scans have been analysed using a conventional approach of semi-automatic segmentation, and a second approach with automatic segmentation. For each kidney and at each time point the percentage of change in renal volume was calculated using both techniques. After review, volume assessment was feasible for all CT scans. For the left kidney, the intraclass correlation coefficient (ICC) was 0.794 and 0.877 at 1 month and 1 year, respectively. For the right side, the ICC was 0.817 at 1 month and 0.966 at 1 year. The automated technique reliably detected a decrease in renal volume for the eight patients with occluded renal arteries during follow up. This is the first report of a fusion-based algorithm to detect changes in renal volume during postoperative surveillance using an automated process. Using this technique, the standardized assessment of renal volume could be implemented with greater ease and reproducibility and serve as a warning of potential renal impairment.

Total Endovascular Treatment of Aortic Arch Disease Using an Arch Endograft With 3 Inner Branches.

PURPOSE: To report early experience with a new endovascular graft developed for aortic arch aneurysm repair in patients unfit for open surgery. CASE REPORT: Three consecutive men (62, 74, and 69 years old) at high risk for open repair were treated for postdissection aortic arch aneurysms using a custom-made 3 inner branched endovascular graft. The 2 proximal branches are antegrade and perfuse the innominate artery and the left common carotid artery; the third branch is retrograde and perfuses the left subclavian artery. The latter is preloaded with a catheter and wire to aid cannulation. Technical success was achieved in each case. The mean procedure time, fluoroscopy duration, and contrast volume were 180 minutes, 35 minutes, and 145 mL, respectively. The perioperative period was uneventful. All branches were patent on 6-month computed tomography and duplex ultrasound imaging. CONCLUSION: This new patient-specific device allows total endovascular revascularization of the supra-aortic trunks during arch repair. These encouraging results support its more widespread use.

Rapid Aneurysmal Sac Expansion Following Endovascular Repair of a Dissecting Thoracoabdominal Aneurysm.

Endovascular repair of dissecting thoracoabdominal aneurysms (TAAA) is challenging and often requires multiple procedures. A 61-year-old man with a dissecting type-II TAAA treated first by placement of a thoracic endograft, and subsequently implantation of a fenestrated endograft. Six months postoperatively, a 10-mm increase of the aorta was observed. A reentry tear in left external iliac artery (EIA) was perfusing the false lumen in a retrograde fashion connecting with the endoleak caused by the inferior mesenteric artery and lumbar arteries. False lumen embolization of the left EIA and outflow vessels was performed. Thrombosis and rapid decrease of false lumen diameter was then observed. This case illustrates the complexity of endovascular management of extensive chronic aortic dissections.

Total Endovascular Aortic Repair in a Patient with Marfan Syndrome.

BACKGROUND: The aim of this study is to describe a total endovascular aortic repair with branched and fenestrated endografts in a young patient with Marfan syndrome and a chronic aortic dissection. Open surgery is the gold standard to treat aortic dissections in patients with aortic disease and Marfan syndrome. METHODS: In 2000, a 38-year-old man with Marfan syndrome underwent open ascending aorta repair for an acute type A aortic dissection. One year later, a redo sternotomy was performed for aortic valve replacement. In 2013, the patient presented with endocarditis and pulmonary infection, which necessitated tracheostomy and temporary dialysis. In 2014, the first stage of the endovascular repair was performed using an inner branched endograft to exclude a 77-mm distal arch and descending thoracic aortic aneurysm. In 2015, a 63-mm thoracoabdominal aortic aneurysm was excluded by implantation of a 4-fenestrated endograft. Follow-up after both endovascular repairs was uneventful. RESULTS: Total aortic endovascular repair was successfully performed to treat a patient with arch and thoraco-abdominal aortic aneurysm associated with chronic aortic dissection and Marfan syndrome. The postoperative images confirmed patency of the endograft and its branches, and complete exclusion of the aortic false lumen. CONCLUSIONS: Endovascular repair is a treatment option in patients with connective tissue disease who are not candidates for open surgery. Long-term follow-up is required to confirm these favorable early outcomes.

Endovascular Repair of Thoracoabdominal and Arch Aneurysms in Patients with Connective Tissue Disease Using Branched and Fenestrated Devices.

BACKGROUND: Prophylactic open surgery is the standard practice in patients with connective tissue and thoracoabdominal aortic aneurysm (TAAA) and aortic arch disease. Branched and fenestrated devices offer a less invasive alternative but there are concerns regarding the durability of the repair and the effect of the stent graft on the fragile aortic wall. The aim of this study is to evaluate mid-term outcomes of fenestrated and/or branched endografting in patients with connective tissue disease. METHODS: All patients with connective tissue disease who underwent TAAA or arch aneurysm repair using a fenestrated and/or branched endograft in a single, high-volume center between 2004 and 2015 were included. Ruptured aneurysms and acute aortic dissections were excluded from this study, but not chronic aortic dissections. RESULTS: In total, 427 (403 pararenal and TAAAs, and 24 arch aneurysms) endovascular interventions were performed during the study period. Of these, 17 patients (4%) (16 TAAAs, 1 arch) had connective tissue disease. All patients were classified as unfit for open repair. The mean age was 51 ± 8 years. Thirteen patients with TAAA were treated with a fenestrated, 1 with a branched, and 2 with a combined fenestrated/branch device. A double inner branch device was used to treat the arch aneurysm. The technical success rate was 100% with no incidence of early mortality, spinal cord ischemia, stroke, or further dissection. Postoperative deterioration in renal function was seen in 3 patients (18.8%) and no hemodialysis was required. The mean follow-up was 3.4 years (0.3-7.4). Aneurysm sac shrinkage was seen in 35% of patients (6/17) and the sac diameter remained stable in 65% of patients (11/17). No sac or sealing zone enlargement was observed in any of the patients and there were no conversions to open repair. Reintervention was required in 1 patient at 2 years for bilateral renal artery occlusion (successful fibrinolysis). One type II endoleak (lumbar) is under surveillance and 1 type III (left renal stent) sealed spontaneously. One patient died at 2 years after the procedure from nonaortic causes (endocarditis). CONCLUSIONS: The favorable mid-term outcomes in this series that demonstrate fenestrated and/or branched endografting should be considered in patients with connective tissue and TAAA and aortic arch disease, which are considered unfit for open surgery. All patients require close lifetime surveillance at a center specializing in aortic surgery, with sufficient experience in both open and endovascular aortic surgery, so that if endovascular treatment failure occurs it can be recognized early and further treatment offered.

Results of celiac trunk stenting during fenestrated or branched aortic endografting.

BACKGROUND: Endovascular repair of aortic aneurysms involving the visceral segment of the aorta often requires placement of a covered bridging stent in the celiac axis (CA). The median arcuate ligament (MAL) is a fibrous arch that unites the diaphragmatic crura on either side of the aortic hiatus. The ligament may compress and distort the celiac artery and result in difficult cannulation, or stenosis and occlusion of the vessel. This study evaluated the influence of the MAL compression on the technical success and the patency of the celiac artery after branched and fenestrated endovascular aortic repair. METHODS: We retrospectively analyzed a cohort of consecutive patients treated electively for complex aneurysms with branched and fenestrated endovascular aortic repair between January 2007 and April 2014. All data were collected prospectively. Analysis of preoperative computed tomography angiography on a three-dimensional workstation determined the presence of MAL compression. Patency of the CA bridging stent was assessed during follow-up by computed tomography angiography and duplex ultrasound evaluation. Statistical analysis was performed to compare the outcomes of patients with MAL (MAL+) and without MAL (MAL-) compression. RESULTS: Of 315 patients treated for aortic disease involving the visceral segment during the study period, 113 had endografts designed with a branch (n = 57) or fenestration (n = 56) for the CA. In 45 patients (39.8%), asymptomatic compression of the CA by the MAL was depicted (MAL+). Complex endovascular techniques were required in this group to access the CA in 16 (14.2%) patients (vs none in the MAL- group; P = .003), which lead to a failed bridging stent implantation in seven patients (6.2%). Increased operative time and dose area product were observed in the MAL+ group, but this did not reach statistical significance. In the MAL+ group, no thrombosis of the CA bridging stents were observed during follow-up; an external compression of the CA bridging stent was depicted in six patients but without hemodynamic effect on duplex ultrasound imaging. In the MAL- group, one CA bridging stent occlusion occurred owing to an embolus from a cardiac source. CONCLUSIONS: MAL compression is associated with good celiac trunk bridging stent patency during follow-up, but with a higher rate of technical difficulties and failed bridging stent implantation during the procedure.

Translumbar Puncture for Retrograde Catheterization of a Kinked Left Renal Stent After Fenestrated Endograft Repair.

PURPOSE: To describe a case of percutaneous retrograde left renal artery cannulation and restenting for severe distortion of a bridging stent diagnosed at the time of fenestrated endovascular aneurysm repair (FEVAR). CASE REPORT: A 79-year-old man underwent 4-vessel FEVAR, during which completion angiography showed a good postoperative result, but cone beam computed tomography (CBCT) demonstrated severe distortion of the proximal part of the left renal stent. An antegrade or hybrid approach to recannulate the vessel was not possible due to the stent architecture and patient comorbidities. Contrast-enhanced CBCT was used to define the needle trajectory for a percutaneous translumbar approach. Fusion imaging software registered the planned needle track to the live fluoroscopy image. Respiratory motion compensation was used. Retrograde cannulation of the left renal artery was achieved; via a through-and-through wire with the left femoral artery, the left renal artery stent was relined using a covered stent. No deterioration of renal function was observed following the procedure. Contrast-enhanced duplex ultrasound demonstrated good flow in all target vessels without endoleak. CONCLUSION: Translumbar puncture and retrograde catheterization of a severely distorted left renal artery stent is possible during FEVAR using advanced imaging applications and can prevent target vessel loss.

Renal outcomes analysis after endovascular and open aortic aneurysm repair.

OBJECTIVE: The purpose of this study was to compare renal outcomes (glomerular filtration rate [GFR] and renal volume) after endovascular aneurysm repair (EVAR) and open repair (OR) of abdominal aortic aneurysm (AAA). METHODS: All AAA repairs performed between November 2009 and July 2011 were included in this retrospective study. Patients requiring suprarenal clamping and renal bypass or reimplantation and patients requiring fenestrated endografting were excluded from the OR and EVAR groups, respectively. All EVARs were performed with transrenal proximal fixation. Renal volume (calculated with a three-dimensional workstation) and GFR (estimated with the Modification of Diet in Renal Disease formula) were evaluated before the procedure, at 12 months after the procedure, and yearly thereafter. RESULTS: The study included 90 patients (41 ORs and 49 EVARs). Both groups were comparable except for age at intervention, body mass index, smoking, peripheral arterial disease, arrhythmia, and vitamin K antagonist treatment. Median follow-up was 2.8 years for OR (2.5-2.9 years) and 3.2 years for EVAR (3.0-3.4 years). In both groups, we found a significant decrease when comparing postoperative estimated GFR with 1-year (14.4% decrease [3.8%-23.8%]; P = .002) and 3-year (12.8% decrease [3.8%-20.9%]; P = .0007) levels. In both groups, total renal volumes significantly diminished. Median preoperative total renal volume (372 cm(3) [311-349]) significantly decreased (6.7% [2.8%-10.5%]; P = .008) between 1 year and 2 years of follow-up. CONCLUSIONS: Renal function impairment is similar after open and endovascular AAA repair. It is associated with a decrease in total renal volume, which seems to be an early and constant marker of postoperative renal impairment.

Evaluation of the Zenith low-profile abdominal aortic aneurysm stent graft.

BACKGROUND: Low-profile (LP) stent grafts are now commercially available in Europe for endovascular aortic aneurysm repair (EVAR). In this study the midterm outcomes and characteristics of patients treated with this last generation of stent grafts were compared with a cohort of patients treated with "standard-profile" (SP) stent grafts. METHODS: The current study enrolled all patients treated for elective EVAR by the SP Zenith Flex stent graft (Cook Medical, Bloomington, Ind) between March 2010 and November 2011 and patients treated for elective EVAR by the Zenith LP stent graft (Cook Medical) between November 2011 and March 2013. All patients had a follow-up >18 months. Preoperative computed tomography angiograms were analyzed on a dedicated three-dimensional workstation. All data were prospectively collected in an electronic database and retrospectively analyzed. A comparative study was conducted. RESULTS: The present study included 208 patients (107 SP and 101 LP). Patients' physiologic characteristics were similar in both groups. The iliac anatomy was considered "more challenging" in LP patients: respectively, 7% and 22% (P = .002) of SP and LP patients had bilateral external iliac diameter <7 mm; and 16% and 34% (P = .005) had a combination of an external iliac diameter <7 mm and an iliac tortuosity ratio index >1.5. No 30-day deaths were documented. The 24-month freedom from reintervention and overall survival rates after SP and LP were, respectively, 88% and 91% (P = .450) and 92% and 96% (P = .153). The 24-month rates for freedom from sac expansion and from limb occlusion were 96.4% and 98.7% (P = .320) and 92% and 95% (P = .293), respectively. One patient in each group presented with a type I endoleak during follow-up, and two LP patients presented with a type III endoleak (P = .235). CONCLUSIONS: This study demonstrates that the last-generation LP stent grafts have favorable midterm outcomes similar to SP stent grafts despite being used to treat more patients with unfavorable iliac anatomy.

Fenestrated endografting after bare metal dissection stent implantation.

PURPOSE: To present a case that demonstrates the ability to deploy a 4-fenestrated endograft in an aorta previously treated with an endovascular graft and additional distal bare stents for acute type B dissection. CASE REPORT: Five years ago, a 61-year-old man had a Zenith TX2 endovascular graft and 2 distal bare metal stents deployed for acute type B dissection. In follow-up, a distal extension endograft was deployed below the bare stent for false lumen reperfusion and aortic growth. The ascending aorta and the arch were replaced surgically at 3 years, with the distal end of the graft sewn to the existing endograft. At the current admission, a Crawford type III thoracoabdominal aortic aneurysm was found and excluded with a 4-fenestration endograft. Using 3-dimensional fusion imaging, there was no major conflict with the struts of the bare dissection stent during catheterization and bridging stent placement. A distal bifurcated endograft was also implanted. The total procedure time was 240 minutes, the radiation dose was 8066 cGy·cm(2), and the contrast volume was 100 mL. The patient was discharged on the sixth postoperative day and continues to do well at 9 months. CONCLUSION: Prior dissection stent deployment within the thoracoabdominal segment does not preclude further fenestrated endograft placement. Intraoperative fusion imaging can be very helpful to the successful completion of these complex procedures.

A Staged Hybrid Procedure to Manage Complex Cerebral Hypoperfusion in Aortic Arch Aneurysm.

We report the management of a patient who had an open-surgical repair following traumatic avulsion of the supra-aortic trunks (SAT) 30 years prior to presentation with a large arch aneurysm and poor cerebral collaterals. "Simple" thoracic endovascular aneurysm repair (TEVAR) was not an option because it would have excluded the collateral circulation to the carotid and vertebral arteries. We devised a two-stage hybrid procedure to repair this challenging aneurysm.

Learning curve in fenestrated and branched grafting.

In surgical practice new technologies and techniques require a period of adjustment before the main operator becomes familiar with the new procedure, improving the results and the performances. This period, called learning curve, could be applied into the endovascular aortic treatment. The CUSUM technique had been used to define the learning curve in new procedures and through the literature some studies applied it to demonstrate the improving outcomes in complex endovascular aneurysm repair during increasing experience time. However, in the complex endovascular field this period included also other factors besides the proficiency in the deployment, as the improvement in patient selection and device design, making difficult to determine the level of experience needed to become an expert.

[Arterial revascularization techniques] / Techniques de revascularisation des artériopathies

Arterial revascularization techniques. Patients with critical limb ischemia are at risk of major amputation. The latest developments in endovascular technology and techniques provide a less invasive and valuable alternative to conventional open surgery. Major improvements in angioplasty balloons and stents have been achieved in recent years. New devices such as atherectomy catheters and dedicated guidewires have been developed and are available to treat chronic-total-occlusions (CTO) of the peripheral arteries. In parallel, new techniques have been developed to achieve more complex endovascular revascularisation; these include intraluminal recanalisation, and the SAFARI technique, which is the combination of antero and retrograde approaches to treat the femoral, popliteal and pedal arteries. Currently, only limited data are available to support these last advances in the literature. The continued uptake of these new techniques in the future will be associated with shorter hospital stay and faster recovery.

Techniques de revascularisation des artériopathies. Dans le cadre de l'ischémie critique chronique, la menace pour le patient de perdre le membre hypoperfusé engage le chirurgien à proposer un geste de revascularisation rapide. Celui-ci peut être réalisé par chirurgie ouverte, ou par des techniques de revascularisation endovasculaires moins invasives. L'engouement récent pour les traitements endovasculaires en pathologie artérielle périphérique est contemporain du développement d'outils spécifiquement dédiés à ce type de procédures. Des améliorations sur les ballons et les stents ont été proposées ; de nouveaux dispositifs, comme les cathéters d'athérectomie ont été développés. Des améliorations sur les introducteurs, guides et cathéters ont été effectuées pour répondre à l'évolution des stratégies de revascularisation : des techniques comme SAFARI, avec ponction rétrograde des artères jambières pour le traitement de l'artère fémorale superficielle ou des artères jambières, sont désormais courantes. Il est néanmoins difficile d'évaluer les résultats de la modification de nos pratiques grâce à l'utilisation de ces nouvelles techniques. La grande hétérogénéité de patients traités et de morphologies des lésions artérielles rend complexe l'interprétation des résultats publiés.

Treatment options for postdissection aortic aneurysms.

Aortic dissection is one of the most devastating catastrophes that can affect the aorta. Surgical treatment is proposed only when complications such as rupture or malperfusion occur. No clear consensus has been reached regarding the best therapy to prevent aortic rupture after the acute phase. We have performed a thorough review of the most recent literature on the strategies to treat patients in the chronic phase of aortic dissection.

Image fusion performed with noncontrast computed tomography scans during endovascular aneurysm repair.

We report two endovascular aneurysm repair procedures achieved under image fusion guidance accomplished with noncontrast injected preoperative computed tomography scans. Such use of this advanced imaging application reduces contrast media injection volume (respectively, 27 and 24 mL throughout the patients' hospital course). No changes in creatinine clearance occurred after the procedures. Contrast-enhanced ultrasound imaging confirmed technical success in both cases.