Pararenal Aortic Thrombus in Patients Undergoing Aortic Aneurysm Repair With Chimney Technique.

INTRODUCTION: Chimney technique (chimney graft in abdominal aortic aneurysm repair [ChEVAR]) can be used to treat patients with pararenal aortic aneurysm unfit for open surgery and not suitable for custom-made fenestrated endograft. Since almost 1 in 5 patients undergo a reintervention within 3 years, features associated with higher risk of complications need to be investigated to tailor the follow-up schedule to each patient. The aim of our study was to assess the impact of mural thrombus in the pararenal aorta on perioperative and follow-up complications after ChEVAR. METHODS: All consecutive patients undergoing ChEVAR at our center from 2015 to 2022 were included in this retrospective study. Collected variables included number of target vessels, stent graft size, presence, and severity of mural thrombus in pararenal aorta, which was reported with a scoring system from 0 to 10 based on thrombus type, thickness area, and circumferenceAnalyzed outcomes included perioperative and follow-up complications. RESULTS: Thirty-one patients underwent ChEVAR during the study period. In 4 patients the indication for ChEVAR was type 1A endoleak after a previous endovascular aneurysm repair (EVAR). The number of target vessels was 1 in 17 patients (55%), 2 in 12 (39%), 3 in 1 (3%), and 4 in 1 (%). The mean mural thrombus score was 5.9. Complications were the following: type 1A endoleak in 4 cases (13%), chimney stent complications in 7 cases (23%) (including partial or total thrombosis, intrastent stenosis, displacement), renal function worsening during follow-up in 8 cases (26%). Overall survival was 90% at 2 years. Patients with severe mural thrombus showed lower freedom from ChEVAR-related complications (28% vs 59% at 2 years, p=0.023). CONCLUSIONS: The presence of severe pararenal aortic mural thrombus was associated with lower freedom from ChEVAR-related complications in patients undergoing ChEVAR for pararenal aortic aneurysm repair. Further research with a larger number of patients is required to confirm these results. CLINICAL IMPACT: The analysis of severity of mural thrombus in pararenal aorta, which was reported with a scoring system from 0 to 10 based on thrombus type, thickness area and circumference, can be useful and can be represent an important predictor element for complications in patient submitted to Chimney tecnique; in fact the presence of severe pararenal aortic mural thrombus was associated with lower freedom from ChEVAR-related complications in patients undergoing ChEVAR for pararenal aortic aneurysm repair. Then, in patient with pararenal aortic aneurysm, a preoperative evaluation could be focused on severity of mural thrombus to minimize the complications in ChEVAR tecnique or to change the surgical strategy.

Popliteal-to-Distal Extreme Bypass in Endovascular Era.

BACKGROUND: Chronic limb-threatening ischemia (CLTI) is characterized by rest pain and tissue loss, with an annual mortality rate of 20% and amputation rate of 40%, if not treated. Open bypass surgery is recommended in CLTI, depending on the availability of good quality venous material, outflow artery patency, and surgical expertise. The aim of the study is to analyze primary patency, limb salvage, and survival rate in patients undergoing popliteal-to-distal bypass. METHODS: All consecutive patients who underwent popliteal-to-distal bypass surgery between January 2016 and December 2021 were enrolled in the study. Primary outcomes were primary patency, limb salvage, and overall survival. Secondary outcomes included amputation-free survival and secondary patency. RESULTS: Forty-nine patients were included during the study. Technical success was achieved in 100% of cases. Target outflow artery was in 27% (n. 13) of cases the anterior tibial artery, in 27% (n. 13) the dorsalis pedis, in 2% (n. 1) the peroneal artery, in 30% (n. 15) the retromalleolar tibial artery, in 10% (n. 5) the medial plantar artery, and in 4% (n. 2) the tarsal artery. Two-year primary patency was 85% ± 5. Secondary patency rates were 86% ± 3 at 2 years. The overall survival was 81% ± 6 at 2 years, the amputation-free survival was 70% ± 9, and the limb salvage rate was 81% ± 6. CONCLUSIONS: Popliteal-to-distal bypass requires high technical expertise to be performed. When a good autologous vein and adequate outflow artery are present, they can be feasible with good patency rates and overall survival.

Factors associated with successful median arcuate ligament release in an international, multi-institutional cohort.

OBJECTIVE: Prior research on median arcuate ligament syndrome has been limited to institutional case series, making the optimal approach to median arcuate ligament release (MALR) and resulting outcomes unclear. In the present study, we compared the outcomes of different approaches to MALR and determined the predictors of long-term treatment failure. METHODS: The Vascular Low Frequency Disease Consortium is an international, multi-institutional research consortium. Data on open, laparoscopic, and robotic MALR performed from 2000 to 2020 were gathered. The primary outcome was treatment failure, defined as no improvement in median arcuate ligament syndrome symptoms after MALR or symptom recurrence between MALR and the last clinical follow-up. RESULTS: For 516 patients treated at 24 institutions, open, laparoscopic, and robotic MALR had been performed in 227 (44.0%), 235 (45.5%), and 54 (10.5%) patients, respectively. Perioperative complications (ileus, cardiac, and wound complications; readmissions; unplanned procedures) occurred in 19.2% (open, 30.0%; laparoscopic, 8.9%; robotic, 18.5%; P < .001). The median follow-up was 1.59 years (interquartile range, 0.38-4.35 years). For the 488 patients with follow-up data available, 287 (58.8%) had had full relief, 119 (24.4%) had had partial relief, and 82 (16.8%) had derived no benefit from MALR. The 1- and 3-year freedom from treatment failure for the overall cohort was 63.8% (95% confidence interval [CI], 59.0%-68.3%) and 51.9% (95% CI, 46.1%-57.3%), respectively. The factors associated with an increased hazard of treatment failure on multivariable analysis included robotic MALR (hazard ratio [HR], 1.73; 95% CI, 1.16-2.59; P = .007), a history of gastroparesis (HR, 1.83; 95% CI, 1.09-3.09; P = .023), abdominal cancer (HR, 10.3; 95% CI, 3.06-34.6; P < .001), dysphagia and/or odynophagia (HR, 2.44; 95% CI, 1.27-4.69; P = .008), no relief from a celiac plexus block (HR, 2.18; 95% CI, 1.00-4.72; P = .049), and an increasing number of preoperative pain locations (HR, 1.12 per location; 95% CI, 1.00-1.25; P = .042). The factors associated with a lower hazard included increasing age (HR, 0.99 per increasing year; 95% CI, 0.98-1.0; P = .012) and an increasing number of preoperative diagnostic gastrointestinal studies (HR, 0.84 per study; 95% CI, 0.74-0.96; P = .012) Open and laparoscopic MALR resulted in similar long-term freedom from treatment failure. No radiographic parameters were associated with differences in treatment failure. CONCLUSIONS: No difference was found in long-term failure after open vs laparoscopic MALR; however, open release was associated with higher perioperative morbidity. These results support the use of a preoperative celiac plexus block to aid in patient selection. Operative candidates for MALR should be counseled regarding the factors associated with treatment failure and the relatively high overall rate of treatment failure.

Contemporary outcomes after treatment of aberrant subclavian artery and Kommerell's diverticulum.

OBJECTIVE: Aberrant subclavian artery (ASA) and Kommerell's diverticulum (KD) are rare vascular anomalies that may be associated with lifestyle-limiting and life-threatening complications. The aim of this study is to report contemporary outcomes after invasive treatment of ASA/KD using a large international dataset. METHODS: Patients who underwent treatment for ASA/KD (2000-2020) were identified through the Vascular Low Frequency Disease Consortium, a multi-institutional collaboration to investigate uncommon vascular disorders. We report the early and mid-term clinical outcomes including stroke and mortality, technical success, and other operative outcomes including reintervention rates, patency, and endoleak. RESULTS: Overall, 285 patients were identified during the study period. The mean patient age was 57 years; 47% were female and 68% presented with symptoms. A right-sided arch was present in 23%. The mean KD diameter was 47.4 mm (range, 13.0-108.0 mm). The most common indication for treatment was symptoms (59%), followed by aneurysm size (38%). The most common symptom reported was dysphagia (44%). A ruptured KD was treated in 4.2% of cases, with a mean diameter of 43.9 mm (range, 18.0-100.0 mm). An open procedure was performed in 101 cases (36%); the most common approach was ASA ligation with subclavian transposition. An endovascular or hybrid approach was performed in 184 patients (64%); the most common approach was thoracic endograft and carotid-subclavian bypass. A staged operative strategy was employed more often than single setting repair (55% vs 45%). Compared with endovascular or hybrid approach, those in the open procedure group were more likely to be younger (49 years vs 61 years; P < .0001), female (64% vs 36%; P < .0001), and symptomatic (85% vs 59%; P < .0001). Complete or partial symptomatic relief at 1 year after intervention was 82.6%. There was no association between modality of treatment and symptom relief (open 87.2% vs endovascular or hybrid approach 78.9%; P = .13). After the intervention, 11 subclavian occlusions (4.5%) occurred; 3 were successfully thrombectomized resulting in a primary and secondary patency of 95% and 96%, respectively, at a median follow-up of 39 months. Among the 33 reinterventions (12%), the majority were performed for endoleak (36%), and more reinterventions occurred in the endovascular or hybrid approach than open procedure group (15% vs 6%; P = .02). The overall survival rate was 87.3% at a median follow-up of 41 months. The 30-day stroke and death rates were 4.2% and 4.9%, respectively. Urgent or emergent presentation was independently associated with increased risk of 30-day mortality (odds ratio [OR], 19.8; 95% confidence interval [CI], 3.3-116.6), overall mortality (OR, 3.6; 95% CI, 1.2-11.2) and intraoperative complications (OR, 8.3; 95% CI, 2.8-25.1). Females had a higher risk of reintervention (OR, 2.6; 95% CI, 1.0-6.5). At an aneurysm size of 44.4 mm, receiver operator characteristic curve analysis suggested that 60% of patients would have symptoms. CONCLUSIONS: Treatment of ASA/KD can be performed safely with low rates of mortality, stroke and reintervention and high rates of symptomatic relief, regardless of the repair strategy. Symptomatic and urgent operations were associated with worse outcomes in general, and female gender was associated with a higher likelihood of reintervention. Given the worse overall outcomes when symptomatic and the inherent risk of rupture, consideration of repair at 40 mm is reasonable in most patients. ASA/KD can be repaired in asymptomatic patients with excellent outcomes and young healthy patients may be considered better candidates for open approaches versus endovascular or hybrid modalities, given the lower likelihood of reintervention and lower early mortality rate.

International Multi-Institutional Experience with Presentation and Management of Aortic Arch Laterality in Aberrant Subclavian Artery and Kommerell's Diverticulum.

BACKGROUND: Aberrant subclavian artery (ASA) with or without Kommerell's diverticulum (KD) is a rare anatomic aortic arch anomaly that can cause dysphagia and/or life-threatening rupture. The objective of this study is to compare outcomes of ASA/KD repair in patients with a left versus right aortic arch. METHODS: Using the Vascular Low Frequency Disease Consortium methodology, a retrospective review was performed of patients ≥18 years old with surgical treatment of ASA/KD from 2000 to 2020 at 20 institutions. RESULTS: 288 patients with ASA with or without KD were identified; 222 left-sided aortic arch (LAA), and 66 right-sided aortic arch (RAA). Mean age at repair was younger in LAA 54 vs. 58 years (P = 0.06). Patients in RAA were more likely to undergo repair due to symptoms (72.7% vs. 55.9%, P = 0.01), and more likely to present with dysphagia (57.6% vs. 39.1%, P < 0.01). The hybrid open/endovascular approach was the most common repair type in both groups. Rates of intraoperative complications, death within 30 days, return to the operating room, symptom relief and endoleaks were not significantly different. For patients with symptom status follow-up data, in LAA, 61.7% had complete relief, 34.0% had partial relief and 4.3% had no change. In RAA, 60.7% had complete relief, 34.4% had partial relief and 4.9% had no change. CONCLUSIONS: In patients with ASA/KD, RAA patients were less common than LAA, presented more frequently with dysphagia, had symptoms as an indication for intervention, and underwent treatment at a younger age. Open, endovascular and hybrid repair approaches appear equally effective, regardless of arch laterality.

Endovascular Reconstruction for Total Aorto-Iliac Occlusion.

OBJECTIVES: To analyze outcomes following endovascular treatment of total occlusion of the infrarenal aorta and aorto-iliac bifurcation in a multicenter Italian registry. METHODS: It is a multicenter, retrospective, observational cohort study. From January 2015 to December 2018, 1306 endovascular interventions for aorto-iliac occlusive disease were recorded in the vascular registry. For this analysis, only patients treated for total occlusion of the infrarenal aorta and aorto-iliac bifurcation were included. Early (<30 days) primary outcomes of interest were technical success and mortality. Late major outcomes were primary and secondary patency and freedom from conversion to open aortic surgery. RESULTS: A total of 54 (4.1%) patients met the inclusion criteria. Total percutaneous revascularization was possible in 41 (75.9%) patients and hybrid (endo plus open) intervention in 13 (24.1%) patients. The kissing-stent-graft technique was used in 45 (83.3%) cases, covered endovascular reconstruction of the aortic bifurcation (CERAB) in 5 (9.2%), and a unibody endograft deployed in 4 (7.4%). Technical success was 98.1% (n = 53). There were no episodes of intraoperative or perioperative vessel rupture. Conversion to open surgery was not necessary, and there were no in-hospital deaths. The median patient follow-up time was 16 months (interquartrile range [IQR], 6-27). The estimated primary patency rate was 95.8% ± 0.03 (95% confidence interval [CI]: 85.5-98.9) at 1 year, 91.4% ± 0.05 (95% CI: 76.2-97.2) at 2 years, and 85 ± 0.08 (95% CI: 64.5-94.6) at 3 years. Cox regression analysis demonstrated that sex (hazard ratio [HR]: 0.96; 95% CI: 0.15-6.23, p = 0.963), extent of the occlusion (HR: 0.28; 95% CI: 0.05-1.46, p = 0.130), calcium score (HR: 1.88; 95% CI: 0.31-11.27, p = 0.490), or type of endovascular reconstruction (HR: 0.80; 95% CI: 0.13-5.15, p = 0.804) did not affect primary patency. Secondary patency was 95.5% ± 0.04 (95% CI: 78.4-99.2) at 3 years. No patients required late conversion to open surgical bypass. CONCLUSIONS: Endovascular reconstruction for total occlusion of the infrarenal aorta and aorto-iliac bifurcation was successful using a combination of percutaneous and hybrid revascularization techniques. Estimated patency rates at 3 years of follow-up are promising and are unaffected by the extent of occlusion or type of revascularization.

Early and Midterm Results after Endovascular Repair of Non-infected Saccular Lesions of the Infrarenal Aorta.

OBJECTIVE: The aim was to report short and midterm outcomes of a cohort of consecutive patients treated by endovascular aortic repair (EVAR) for saccular lesion of the abdominal aorta (sl-AA). METHODS: This was a multicentre, retrospective, financially unsupported physician initiated, observational cohort study that involved tertiary referral from Italian hospitals. For this study, between January 2010 and December 2020, only those patients treated by EVAR for non-infected sl-AA, namely blister/ulcer like projection and/or penetrating aortic ulcer, were analysed. Primary outcomes of interest were overall survival and freedom from aorta related mortality (ARM). RESULTS: The final cohort included 120 of 3 982 eligible aortic lesions. There were 103 (85.8%) males and 17 (14.2%) females. The median age was 76 years (interquartile range [IQR] 69, 80). Rupture on admission was observed in 10 (8.3%) cases. Early (≤ 30 days) death occurred in two (1.7%) patients. There were five (4.2%) complications requiring surgical re-intervention (iliac limb occlusion n = 4; groin haematoma, n = 1). The median duration of follow up was 20 months (IQR 4, 59.5): the estimated overall survival was 85.5% (standard error [SE] 0.035; 95% confidence interval [CI] 77.3 - 91.1) at 12 months, 78.7% (SE 0.044; 95% CI 69.0 - 86.0) at 36 months, and 74% (SE 0.050; 95% CI 63.2 - 82.5) at 60 months. Only one (0.8%) patient required aortic re-intervention during follow up because of a late endograft infection. The estimated freedom from ARM was 96% (SE 0.050; 95% CI 90.3 - 98.2) at 36 and 60 months. Cox's regression analysis identified that death was associated with age > 70 years (hazard ratio [HR] 1.10; 95% CI 1.04 - 1.17, p = .001), and coronary artery disease (HR 1.14; 95% CI 1.04 - 1.26, p = .006). CONCLUSION: EVAR for sl-AA proved to be safe and effective. The mortality rate was low for a group of patients known to be at high risk from open repair, and EVAR remained stable with no ARM during midterm follow up, and an acceptably low 0.8% endograft related re-intervention rate.

Unusual attempted suicide or covered attempted homicide? A neck stabbing case report and review of literature.

A medico-legal consult is frequently required in a clinical context in order to assess the eventual compatibility of specific wounds with a self- or hetero-infliction. Accordingly, the case of a 52-year-old man with a single, penetrating stab wound of the neck, reported as self-inflicted, is here presented. The forensic aspects, taken into account in order to determine the self- or hetero-infliction nature of the wound, are further discussed and compared to cases described in the literature.

Inframalleolar bypass for chronic limb-threatening ischemia.

The aims of this study were to analyze the results of inframalleolar bypass for chronic limb-threatening ischemia (CLTI) and to identify outcome-predicting factors. All consecutive patients undergoing inframalleolar bypass for CLTI between 2015 and 2018 were included in this retrospective, single-center study. Outflow artery was the most proximal patent vessel segment in continuity with inframalleolar arteries. Bypasses originating from the popliteal artery were defined as 'short bypasses'. Sixty patients underwent inframalleolar bypass, with four patients undergoing bilateral procedures, making a total of 64 limbs included. The mean age was 73 ± 14 and 52 (81%) were male. The great saphenous vein was the preferred conduit (n = 58, 91%), in a devalvulated fashion (n = 56, 88%). Superficial femoral artery was the most common inflow artery for 'long' grafts (n = 22, 34%), while popliteal artery was the inflow artery for all 'short' grafts (n = 25, 39%). Dorsalis pedis artery was chosen as an outflow artery in 41 patients (63%). Median follow-up was 21 months. Two-year primary and secondary patency, limb salvage, amputation-free survival, and overall survival rates were 67 ± 6%, 88 ± 4%, 84 ± 4%, 72 ± 6%, and 85 ± 4%, respectively. At multivariate analysis, dialysis was an independent predictor for poor primary patency (HR, 4.6; 95% CI, 1.62-13.05; p = 0.004), whereas a short bypass was independently associated with an increased primary patency (HR, 0.3; 95% CI, 0.10-0.89; p = 0.03). In conclusion, bypass grafting to the inframalleolar arteries resulted in good patency rates, limb salvage and overall survival. Dialysis patients had lower primary patency but still had good limb salvage and survival. Short bypass was a predictor of improved primary patency.

Managing central venous access during a health care crisis.

OBJECTIVE: During the COVID-19 pandemic, central venous access line teams were implemented at many hospitals throughout the world to provide access for critically ill patients. The objective of this study was to describe the structure, practice patterns, and outcomes of these vascular access teams during the COVID-19 pandemic. METHODS: We conducted a cross-sectional, self-reported study of central venous access line teams in hospitals afflicted with the COVID-19 pandemic. To participate in the study, hospitals were required to meet one of the following criteria: development of a formal plan for a central venous access line team during the pandemic; implementation of a central venous access line team during the pandemic; placement of central venous access by a designated practice group during the pandemic as part of routine clinical practice; or management of an iatrogenic complication related to central venous access in a patient with COVID-19. RESULTS: Participants from 60 hospitals in 13 countries contributed data to the study. Central venous line teams were most commonly composed of vascular surgery and general surgery attending physicians and trainees. Twenty sites had 2657 lines placed by their central venous access line team or designated practice group. During that time, there were 11 (0.4%) iatrogenic complications associated with central venous access procedures performed by the line team or group at those 20 sites. Triple lumen catheters, Cordis (Santa Clara, Calif) catheters, and nontunneled hemodialysis catheters were the most common types of central venous lines placed by the teams. Eight (14%) sites reported experience in placing central venous lines in prone, ventilated patients with COVID-19. A dedicated line cart was used by 35 (59%) of the hospitals. Less than 50% (24 [41%]) of the participating sites reported managing thrombosed central lines in COVID-19 patients. Twenty-three of the sites managed 48 iatrogenic complications in patients with COVID-19 (including complications caused by providers outside of the line team or designated practice group). CONCLUSIONS: Implementation of a dedicated central venous access line team during a pandemic or other health care crisis is a way by which physicians trained in central venous access can contribute their expertise to a stressed health care system. A line team composed of physicians with vascular skill sets provides relief to resource-constrained intensive care unit, ward, and emergency medicine teams with a low rate of iatrogenic complications relative to historical reports. We recommend that a plan for central venous access line team implementation be in place for future health care crises.

Intra-Arterial Administration of Iloprost in Patients Undergoing Endovascular or Hybrid Revascularization Procedures for Peripheral Arterial Disease.

BACKGROUND: The aim of this study was to find out if intra-arterial intraoperative iloprost administration, in selected patients undergoing endovascular revascularization procedures, could lead to better results compared with a control group of patients with similar clinical background and risk factors. METHODS: We prospectively collected data of consecutive patients undergoing endovascular or hybrid revascularization in the period from June 2017 to August 2019, which were then retrospectively analyzed. Those patients were divided into 2 groups: iloprost and control groups. Inclusion criteria were as follows: the presence of an arteriography that included the foot; Rutherford class 4-6; and Rutherford class 3 with at least 2 cardiovascular risk factors or previous revascularization procedures on the same limb. The intraoperative intra-arterial administration of iloprost was the inclusion criterion for the iloprost group. Patients with a compromised cardiological condition were excluded, as this was a contraindication for iloprost administration. Patients from the 2 groups were matched using the propensity score matching (PSM) methodology of Rosenbaum and Rubin. The primary outcome was freedom from target lesion revascularization (TLR). The secondary outcomes were limb salvage and overall survival. RESULTS: During the mentioned period, we treated 190 consecutive limbs. The mean follow-up was 11.73 months (median, 10; interquartile range, 5-19). After PSM, the freedom from TLR was significantly better in the iloprost group (78 ± 7%, 74 ± 8%, and 63 ± 9% vs. 67 ± 8%, 50 ± 9%, and 38 ± 10% at 3, 6, and 12 months, respectively; P = 0.043). No significant difference was found in terms of limb salvage (92 ± 5%, 88 ± 6%, and 88 ± 6% vs. 92 ± 4%, 85 ± 6%, and 81 ± 7% at 3, 6, and 12 months, respectively; P = 0.52) and survival (95 ± 3%, 95 ± 3%, and 95 ± 3% vs. 95 ± 4%, 92 ± 5%, and 71 ± 9% at 3, 6, and 12 months, respectively; P = 0.14) between the 2 groups. CONCLUSIONS: These results seem to encourage considering intraoperative use of this adjunct, at least in endovascular revascularization procedures, to improve distal outflow.

Simultaneous Superficial Femoral Artery Angioplasty/Stent Plus Popliteal Distal Bypass for Limb Salvage.

BACKGROUND: Treatment of severe critical limb ischemia (CLI) due to superficial femoral artery (SFA) and below-the-knee (BTK) vessels' involvement could be compromised by the lack of a great saphenous vein (GSV) suitable in its entire length. The purpose of this study is to assess the efficacy of a hybrid endovascular and open lower limbs arterial reconstruction in these patients with multilevel, advanced CLI. METHODS: From 2005 to 2019, we performed hybrid endovascular and surgical treatment for limb salvage in SFA-BTK CLI. This consisted of percutaneous transluminal angioplasty (PTA) with or without stenting of the SFA, along with distal origin vein graft bypass. Inclusion criteria were Rutherford category 5 or 6, lack of a suitable GSV, patency of the popliteal artery, steno-obstructive lesions of the SFA, lesions of the 3 crural vessels >5 cm in length each. The follow-up was performed with duplex scan surveillance of both the bypass graft and PTA sites. RESULTS: The hybrid treatment could be performed in 34 patients. Fifty-six percent of the SFA steno-obstructive lesions were treated with simple PTA, except for the application of a bare metal stent in one patient (3%), while in all the SFA occlusions PTA was completed with covered stents (41%). Thirty-four popliteal-to-distal vein bypass grafts bypass grafts have been performed. There were no perioperative PTA or bypass graft failures. Clinical improvement was achieved in 26 (76%) patients. Overall, primary and secondary patency, limb salvage, and survival rates were 65%, 68%, 75%, and 75% at 5 years, respectively. CONCLUSIONS: A hybrid strategy in multilevel SFA-BTK CLI is a well-established approach. Additional studies are warranted to validate these results.

Hybrid arteriovenous graft for hemodialysis vascular access in a multicenter registry.

OBJECTIVE: The aim of our study was to identify patients' characteristics that predicted a higher chance of arteriovenous graft patency in patients undergoing Gore Hybrid Vascular Graft (GHVG; W. L. Gore & Associates, Flagstaff, Ariz) implantation for hemodialysis access. The GHVG is a polytetrafluroethylene (PTFE) prosthesis with a nitinol-reinforced section (NRS) at the venous end. METHODS: All consecutive patients undergoing GHVG implantation for hemodialysis access at 10 tertiary referral centers between December 2013 and January 2018 were included in the study and compared with a control group of patients undergoing standard PTFE graft implantation. Selection of patients for hybrid graft implantation was based on the impossibility of autogenous vascular access creation. RESULTS: There were 145 patients included in the GHVG group and 218 in the PTFE group. In the GHVG and the PTFE groups, the mean age was 67 ± 13 years and 65 ± 13 years, and male patients totaled 52% and 46%, respectively. The technical success was 99%. The mean duration of the intervention was 100 minutes (median, 95 minutes; interquartile range, 80-120 minutes). The brachial-axillary configuration was used in the majority of cases (n = 78 [54%]). The 5-cm NRS length was prevalent (n = 108 [75%]). The median NRS oversize was 14% (interquartile range, 0%-21%). Mean follow-up was 13 months (range, 0-55 months). Seventy-one patients (49%) underwent at least one reintervention. Primary, assisted primary, and secondary patency estimates at 12 months were 44% ± 5%, 47% ± 5%, and 65% ± 4% for the GHVG group and 41% ± 4%, 53% ± 4%, and 75% ± 3% for the control group, respectively (P = NS). One-year survival was 90% ± 3%. On multivariable Cox regression analysis, hypotension (P < .001; hazard ratio [HR], 5.8; confidence interval [CI], 2.6-13) and diabetes (P = .024; HR, 1.9; CI, 1.1-3.2) were significant predictors of GHVG loss. A larger graft size was protective against GHVG loss (P = .042; HR, 0.73; CI, 0.54-0.99). The 10-cm-long graft showed a tendency toward improved patency but did not reach statistical significance (P = .074; HR, 0.48; CI, 0.21-1.07). CONCLUSIONS: Diabetes and hypotension were predictors of loss of hybrid arteriovenous access. Smaller diameters of NRS were more prone to thrombosis, whereas the 10-cm length seemed to perform better than the 5-cm one.

Long-term Results of Endovascular Treatment of TASC C and D Aortoiliac Occlusive Disease with Expanded Polytetrafluoroethylene Stent Graft.

BACKGROUND: The aim of this study is to retrospectively analyze the early and long-term outcomes of endovascular treatment of Trans-Atlantic Inter-Society Consensus II class C and D (TASC II) aortoiliac occlusive disease with an expanded polytetrafluoroethylene-covered stent graft. METHODS: Between January 2006 and November 2017, 61 patients (53 males, 8 females), with symptomatic aortoiliac stenotic and/or occlusive disease, were treated with VIABAHN (W.L. Gore and Associates, Flagstaff, Ariz) at 2 University medical centers. The morphology of the lesions was evaluated and classified by contrast-enhanced computed tomography angiography. Demographic data, operation details, and postoperative outcomes were collected. Follow-up data were analyzed by a life-table analysis (Kaplan-Meier test). RESULTS: Mean age of the patients was 64.89 ± 10.77 years (range 44-89). Thirty-seven patients (60.7%) presented with severe claudication (Rutherford 3), whereas 21 (34.4%) were in Rutherford class 4 and the remaining 3 patients (4.9%) suffered from necrotic lesions (Rutherford 5/6). Fifty-six patients were smokers (91.8%), 38 (62.3%) had hypertension, 23 (37.7%) had coronary artery disease, 30 (40.2%) had dyslipidemia, 18 (29.5%) had chronic obstructive pulmonary disease, 6 (9.5%) had renal insufficiency (serum creatinine>2.0 mg/dL) and 24 (39.3%) had diabetes. Technical success was achieved in 59/61 patients (96.7%) with 16 patients (26.2%) requiring combined percutaneous brachial access to obtain iliac recanalization. Perioperative mortality was 1.6%, whereas postoperative major complications occurred in 2 patients (3.6%). The mean number of VIABAHN placed was 1.77/patient. Mean follow-up was 31.5 months (range 1-108) and primary patency at 36 months was 94.9%. Two major amputations of the lower limbs occurred during the follow-up. CONCLUSIONS: Open surgery with the aortobifemoral bypass has been the gold standard treatment for complex aortoiliac occlusive disease although complications and mortality still remain significant issues. Our results suggest that endovascular therapy of TASC C and D iliac lesions using the VIABAHN stent graft is feasible, effective, and has good, long-term patency.

Noninvasive continuous arterial pressure monitoring with Clearsight during awake carotid endarterectomy: A prospective observational study.

BACKGROUND: Continuous noninvasive blood pressure (CNBP) measurement using the volume-clamp method is a less invasive alternative compared with invasive intra-arterial monitoring for awake patients during carotid endarterectomy (CEA) under regional anaesthesia. OBJECTIVE: We investigated the agreement of blood pressure (BP) recorded with invasive and CNBP methods during awake CEA. DESIGN: A prospective observational study for assessing agreement with Bland-Altman plots, agreement-tolerability indices (ATI), concordance and interchangeability. SETTING: Azienda Ospedaliera Universitaria G. Martino, Messina, a University tertiary referral centre in Italy. PATIENTS: In 30 consecutive patients, we recorded continuously ipsilateral invasive and noninvasive BPs, from 3 min before carotid cross-clamping to 5 min after unclamping. MAIN OUTCOME MEASURES: Primary outcome was bias, 95% limits of agreement, ATI, concordance and interchangeability for mean arterial pressure (MAP). Secondary outcomes were agreements for systolic arterial pressure and diastolic arterial pressure. Tracking of changes was assessed with four-quadrant polar plots and the trend interchangeability method. Optimal bias was defined as 5 mmHg or less. RESULTS: A total of 2672 invasive and CNBP paired measurements (93% of overall data) were analysed, with a median of 92 readings per patient [IQR 76 to 100]. Mean (SD) bias for MAP, systolic arterial pressure and DAP were -6.8 (6.7), -3.0 (9.7) and -9.0 (5.4) mmHg, respectively. The ATIs were 0.88, 0.95 and 0.71, respectively, where ATI of 1.0 or less and at least 2.0 defined acceptable, marginal and unacceptable agreements. The four-quadrant plot analysis for beat-to-beat differences showed concordance rates of 97.3%, 99.98% and 96.4%, respectively. Polar plot analysis showed 95% limits of agreement of -3 to 3, -2 to 2 and -2 to 2 mmHg respectively. Trend interchangeability method showed an interchangeability rate of 95% for MAP. CONCLUSION: During CEA performed under regional anaesthesia, CNBP offers a less invasive approach for BP monitoring. We found acceptable agreement for MAP defined by an ATI of 0.88 and an excellent 95% global interchangeability rate. A suboptimal bias of 7 mmHg was found with CNBP for MAP.

Current evidence in predictors of aortic growth and events in acute type B aortic dissection.

OBJECTIVES: Acute type B aortic dissection can have a stable course or evolve into aneurysm and subsequent adverse events. The aim of this systematic review was to analyze the morphologic predictors of an adverse course to establish their validity based on consistency of results. METHODS: Fifty-one studies were included in this review, reporting on aortic size, false lumen (FL) size, primary entry tear (ET) size and location, status of FL thrombosis, number of ETs, branch vessels involvement, and FL longitudinal extent. RESULTS: Some predictors showed good consistency, whereas others did not. Aortic size was the most investigated predictor. A larger diameter at presentation predicted worse outcomes, with few exceptions. Both FL size and size relative to true lumen size also predicted an adverse course, although a standardized measurement method was not used. Regarding primary ET size and location, evidence was sparse and somewhat conflicting. Although FL complete thrombosis was consistently associated with a more benign course, the role of partial thrombosis remained unclear and the concept of FL saccular formation might account for the inconsistency, but further evidence is needed. A higher number of re-entry tears was considered to be protective against false channel expansion, but results need to be confirmed. The predictive role of branch vessels involvement and FL longitudinal extent remain controversial. CONCLUSIONS: Among several predictors of aortic growth and events in acute type B aortic dissection, controversial and even conflicting results have been described. Consistent evidence has been demonstrated only for two predictors: aortic size at presentation is associated with adverse events and total FL thrombosis has a protective role.

Initial clinical experience with a polytetrafluoroethylene vascular dialysis graft reinforced with nitinol at the venous end.

OBJECTIVE: The purpose of this study was to examine the outcomes of a vascular hybrid polytetrafluoroethylene (PTFE) graft, provided with a nitinol-reinforced section (NRS) on one end, in hemodialysis vascular access placement. METHODS: A retrospective study was conducted including all the consecutive patients who underwent Gore Hybrid Vascular Graft (GHVG; W. L. Gore & Associates, Flagstaff, Ariz) implantation for hemodialysis access placement between October 2013 and November 2015. A propensity-matched control group was obtained from consecutive patients who underwent standard PTFE arteriovenous graft implantation between January 2010 and July 2013. The selection criteria were inadequate venous material for autogenous arteriovenous fistula placement, patent deep venous circulation, and vein diameter of 4 to 8.5 mm. The implantation technique involves the insertion of the NRS some centimeters into the target vein. Fluoroscopic guidance helps deploy the device in the desired landing zone (ie, position of the proximal end of the NRS), based on anatomic landmarks. Survival, functional patency rates, and complications were compared with a propensity-matched historical control group. Vein diameter, previous vascular access placement, and diabetes were tested as predictors of reintervention with a logistic regression analysis. RESULTS: There were 32 patients (14 men; mean age, 69 ± 14 years) who received the GHVG graft. The historical control group included 43 patients. Technical success was 100%. The graft configuration was brachial-axillary (n = 22 [69%]), brachial-basilic loop (n = 5 [16%]), brachial-antecubital loop (n = 3 [9%]), axilloaxillary loop (n = 1 [3%]), and femoral-femoral loop (n = 1 [3%]). Mean NRS oversize was 20% ± 7% (range, 3%-34%; median, 19%). Perioperative complications requiring revision included acute limb ischemia treated with thrombectomy (n = 1 [3%]) and graft infection requiring explantation (n = 2 [6%]). Two patients (6%) died in the hospital of unrelated causes. The mean follow-up was 15 ± 11 months (range, 0-33 months; median, 15.5). The propensity-matched groups included 25 patients each. Survival estimates at 24 months for the GHVG and standard PTFE groups were 91% ± 6% and 82% ± 9% (P > .05), respectively. The 12-month patency estimates were as follows: functional primary patency, 66% ± 10% vs 51% ± 10% (P > .05); functional assisted primary patency, 75% ± 9% vs 51% ± 10% (P > .05); and functional secondary patency, 79% ± 9% vs 67% ± 10% (P > .05). Reduction in vein diameter was associated with reintervention. CONCLUSIONS: The GHVG is a safe and effective alternative to standard PTFE in hemodialysis access surgery. Careful planning for the landing zone is advisable, especially for small outflow veins. Larger studies and randomized trials are needed to define the role for this device. A study including a greater number of centers experienced with this device is currently under way.

A comparison between aortobifemoral bypass and aortoiliac kissing stents in patients with complex aortoiliac obstructive disease.

OBJECTIVE: The aim of this study was to retrospectively compare early and late results of aortobifemoral bypass and endovascular recanalization with the kissing stent technique in the management of TransAtlantic Inter-Society Consensus II (TASC II) C and D lesions in the aortoiliac district in a multicenter study. METHODS: From January 2006 to December 2013, 210 open and endovascular interventions for TASC II class C and D aortoiliac obstructive lesions were performed at three Italian teaching hospitals. In all the cases, the intervention was performed for aortic and bilateral iliac involvement. An aortobifemoral bypass was performed in 82 patients (group 1); in the remaining 128, an endovascular recanalization with the kissing stent technique was carried out (group 2). Early results in the two groups were compared with the χ2 test. Follow-up results were analyzed with Kaplan-Meier curves and compared with log-rank test. Univariate and multivariate (forward Cox regression) analysis to identify potentially significant predictors of primary patency in the whole study group was performed. RESULTS: Patients in group 2 were more frequently female and more frequently had diabetes and arterial hypertension than patients in group 1. The indication for surgical intervention was the presence of critical limb ischemia in 29 cases in group 1 (35%) and in 31 cases in group 2 (24%; P = .07). Technical success in group 2 was 98.5%; two patients required immediate conversion to open surgery for iliac rupture. There was one perioperative death in group 1 (mortality rate, 1%; P = .2 in comparison with group 2). Four perioperative thromboses occurred, two in group 1 and two in group 2 (in one case requiring conversion to open surgical intervention), and no amputations at 30 days were recorded. Cumulative postoperative local and systemic complications occurred in 17 patients in group 1 (20.5%) and in 9 patients in group 2 (7%; P < .001). Mean duration of follow-up was 38 months (range, 1-96 months). Survival rates at 6 years were 65.5% (standard error [SE], 0.08) in group 1 and 83.5% (SE, 0.08) in group 2 (P = .08; log-rank, 2.2). At the same time interval, primary, assisted primary, and secondary patency rates were similar; reintervention rates were 6% in group 1 (SE, 0.05) and 11% in group 2 (SE, 0.04; P = .3; log-rank, 0.8). Univariate and multivariate analysis showed that only the presence of critical limb ischemia was independently associated with poorer primary patency during follow-up (hazard ratio, 2.4; 95% confidence interval, 0.9-6.4; P = .05). CONCLUSIONS: In this multicenter experience, endovascular repair of aortoiliac complex lesions with the kissing stent technique provided similar satisfactory early and late results to those obtained with open surgery.

Palmitoylethanolamide and Polydatin combination reduces inflammation and oxidative stress in vascular injury.

Acute and chronic inflammation responses are important risk factors for vascular remodeling processes such as in atherosclerosis, arteriosclerosis and restenosis. Inflammation and oxidative stress in the intimal region after vascular damage are a key event in the development of neointimal hyperplasia. In this study, we used this model of vascular damage, which involves the complete ligature of the left carotid artery for 14days, to observe the role of N-palmitoylethanolamine in combination with Polydatin at the dose of 30mg/kg, on regulation of inflammatory process, and oxidative stress. Palmitoylethanolamide (PEA), an endogenous fatty acid amide belonging to the N-acylethanolamine family, has anti-inflammatory and neuroprotective effects. However, PEA lacks direct capacity to prevent formation of free radicals. Polydatin (PLD) that is a natural precursor of resveratrol has antioxidant activity. Thus, the combination of PEA and PLD could have beneficial effects on inflammatory process and oxidative stress. This model shows that 14days after carotid artery ligation there is a significant structural change within the vessel, and that there is an important involvement of the inflammatory pathway in the progression of this disease. In this study we demonstrated that PEA/PLD combination treatment reduces vessel damage, adhesion molecules expression such as intercellular adhesion molecules-1(ICAM-1) and vascular cell adhesion molecules-1(V-CAM), proinflammatory cytokines production (Tumor Necrosis Factor alpha (TNF-α) and Interleukin 1 beta (IL-1ß), the inducible nitric oxide synthase (iNOS) and Poly (ADP-ribose) polymerase (PAR), formation, Nuclear factor kappa-B expression and apoptosis (BAX, Fas-Ligand) activation. Our results clearly demonstrated that treatment with PEA/PLD 30mg/Kg is able to reduce vascular damage and attenuates the inflammatory process.