Preferred Access Research Articles

Appearance of claudin-5+ leukocyte subtypes in the blood and CNS during progression of EAE

BackgroundTight junctions (TJs) are membrane specializations characteristic of barrier-forming membranes, which function to seal the aqueous pathway between endothelial cells or epithelial cells and, thereby, obstruct intercellular solute and cellular movement. However, previous work from our laboratory found that claudin-5 (CLN-5), a TJ protein prominent at the blood–brain barrier (BBB), was also detected, ectopically, on leukocytes (CLN-5+) in the blood and central nervous system (CNS) of mice with experimental autoimmune encephalomyelitis (EAE), a neuroinflammatory, demyelinating disease that is a model for multiple sclerosis. CLN-5 was further shown to be transferred from endothelial cells to circulating leukocytes during disease, prompting consideration this action is coupled to leukocyte transendothelial migration (TEM) into the CNS by fostering transient interactions between corresponding leukocyte and endothelial junctional proteins at the BBB.MethodsTo begin clarifying the significance of CLN-5+ leukocytes, flow cytometry was used to determine their appearance in the blood and CNS during EAE.ResultsFlow cytometric analysis revealed CLN-5+ populations among CD4 and CD8 T cells, B cells, monocytes and neutrophils, and these appeared with varying kinetics and to different extents in both blood and CNS. CLN-5 levels on circulating T cells further correlated highly with activation state. And, the percentage of CLN-5+ cells among each of the subtypes analyzed was considerably higher in CNS tissue than in blood, consistent with the interpretation that CLN-5+ leukocytes gain preferred access to the CNS.ConclusionSeveral leukocyte subtypes variably acquire CLN-5 in blood before they enter the CNS, an event that may represent a novel mechanism to guide leukocytes to sites for paracellular diapedesis across the BBB.

Nitric oxide releasing nanomatrix gel treatment inhibits venous intimal hyperplasia and improves vascular remodeling in a rodent arteriovenous fistula

Vascular access is the lifeline for hemodialysis patients and the single most important component of the hemodialysis procedure. Arteriovenous fistula (AVF) is the preferred vascular access for hemodialysis patients, but nearly 60% of AVFs created fail to successfully mature due to early intimal hyperplasia development and poor outward remodeling. There are currently no therapies available to prevent AVF maturation failure. First, we showed the important regulatory role of nitric oxide (NO) on AVF development by demonstrating that intimal hyperplasia development was reduced in an overexpressed endothelial nitric oxide synthase (NOS3) mouse AVF model. This supported the rationale for the potential application of NO to the AVF. Thus, we developed a self-assembled NO releasing nanomatrix gel and applied it perivascularly at the arteriovenous anastomosis immediately following rat AVF creation to investigate its therapeutic effect on AVF development. We demonstrated that the NO releasing nanomatrix gel inhibited intimal hyperplasia formation (more than 70% reduction), as well as improved vascular outward remodeling (increased vein diameter) and hemodynamic adaptation (lower wall shear stress approaching the preoperative level and less vorticity). Therefore, direct application of the NO releasing nanomatrix gel to the AVF anastomosis immediately following AVF creation may enhance AVF development, thereby providing long-term and durable vascular access for hemodialysis.

Conversion to permanent vascular access is associated with improved markers of hemodialysis efficacy in children: Pediatric nephrology research consortium study

Arteriovenous fistulae (AVF) and grafts (AVG) are preferred permanent vascular access (PVA) for chronic hemodialysis (HD) patients. Our objective was to examine the change in markers of HD efficacy after successful establishment of a PVA among children who started HD with a tunneled cuffed catheter (TCC). Retrospective chart reviews were completed on patients from 20 pediatric dialysis centers. All patients used TCC prior to AVF/AVG, and each patient acted as his/her own control. Data on markers of HD efficacy (single-pool Kt/V, urea reduction ratio (URR), serum albumin and hematocrit (Hct)) were collected at the creation of AVF/AVG and for 2 years thereafter. Statistical methods included hypothesis testing and statistical modeling after adjusting for relevant demographic variables. First PVA was created in 98 individual children: 87 (89%) were AVF and 11 (11%) were AVG. The mean TCC vintage prior to AVF/AVG was 10.4±17.3 months. At 1-year follow-up, Kt/V improved by 0.15±0.06 (p=0.02) and URR improved by 4.54±1.17% (p<0.0001). Furthermore, PVA was associated with improved serum albumin by 0.31±0.07 g/dL (p<0.0001) and Hct by 2.80±0.65% (p<0.0001) at 1 year. These HD efficacy markers remained statistically significant at 2nd-year follow-up. These observations were further supported by the adjusted models. Conversion to AVF was associated with statistically significant improvement in all four markers of HD efficacy at 1-year follow-up. This trend was not demonstrated for subjects who were converted to AVG. Switching to PVA was associated with improved markers of HD efficacy, single-pool Kt/V, URR, serum albumin, and Hct. This improvement was mostly demonstrated at 1 year and maintained for the 2nd year. The potential differential impact of the type of PVA on the trajectory of markers of HD efficacy should be further investigated.

Exploring education preferences of Australian women regarding long-term health after hypertensive disorders of pregnancy: a qualitative perspective

BackgroundHypertensive disorders of pregnancy (HDP) affect 5–10% of pregnant women. Long-term health issues for these women include 2–3 times the risk of heart attacks, stroke and diabetes, starting within 10 years after pregnancy, making long-term health after HDP of major public health importance. Recent studies suggest this knowledge is not being transferred sufficiently to women and how best to transmit this information is not known. This study explored women’s preferred content, format and access to education regarding long-term health after HDP.MethodsThis was a qualitative study and framework analysis was undertaken. Women with a history of HDP who had participated in a survey on long-term health after HDP were invited to participate in this study. During telephone interviews women were asked about preferences and priorities concerning knowledge acquisition around long-term health after HDP.ResultsThirteen women were interviewed. They indicated that they wanted more detailed information about long-term and modifiable risk factors. Their preference was to receive risk counselling from their healthcare provider (HCP) early after giving birth along with evidence-based, print or web-based information to take home. All women suggested more structured postnatal follow-up, with automated reminders for key appointments. Automated reminders should detail rationale for follow-up, recommended tests and discussion topics to be addressed at the appointment.ConclusionOur findings show that most participants wanted information soon after birth with all women wanting information within 12 months post birth, complemented with detailed take-home evidence. Participants indicated preference for structured follow-up via their HCP with automated alerts about the appointment and recommended tests. This evidence can be used to guide the development of education programs for women on health after HDP which may enhance knowledge, preventive health management and more generally improve women’s health trajectories.

Development of open-source software for free-hand 3D vascular ultrasound: Dialysis fistula application.

The arteriovenous fistula (AVF) is the preferred vascular access for End Stage Renal Disease, having superior patency and lower infection risks than prosthetic graft and catheter access. When AVF dysfunction or delayed maturation does occur, the gold standard for diagnosis is the fistula angiogram (a.k.a. fistulogram). 3D ultrasound is available for obstetrical and other specialized uses, but it is cost prohibitive and has a field of view that is too small to cover the region of interest for the dialysis fistula application. We sought to develop a point of care 3D solution using freehand 2D ultrasound data acquisition. We developed open-source software for 3D image reconstruction and projection of an angiogram-like image of the vascular access using a 2D freehand ultrasound scanner. We evaluated this software by comparing the ultrasound "sono-angiogram" images to fistulogram images in five subjects, using visual inspection and by applying the Percent of Exact Match (PEM) as a statistic test. The sono-angiograms showed identifiable characteristics that matched the fistulogram results in all five subjects. The PEM ranged between 42.8% and 77.0%, with Doppler and grayscale ultrasound data, showing complementary advantages and disadvantages when used for sono-angiogram image construction. Motion from freehand ultrasound acquisition was a significant source of mismatch. 3D image generation is a potential advantage with ultrasound data. While further work is needed to improve the accuracy with free hand scanning, fistulogram-like "sono-angiograms" can be generated using point of care 2D ultrasound. Methods such as these may be able to assist in point-of-care diagnosis in the future. The software is open-source, and importantly, the ultrasound data used are non-proprietary and available from any standard ultrasound machine. The simplicity and accessibility of this approach warrant further study.

Carotid artery revascularization using the Walrus balloon guide catheter: safety and feasibility from a US multicenter experience

IntroductionThe Walrus balloon guide catheter (BGC) is a new generation of BGC, designed to eliminate conventional limitations during mechanical thrombectomy.ObjectiveTo report a multi-institutional experience using this BGC for proximal flow...

PD-L1 (Programmed Death Ligand 1) Regulates T-Cell Differentiation to Control Adaptive Venous Remodeling.

Patients with end-stage renal disease depend on hemodialysis for survival. Although arteriovenous fistulae (AVF) are the preferred vascular access for hemodialysis, the primary success rate of AVF is only 30% to 50% within 6 months, showing an urgent need for improvement. PD-L1 (programmed death ligand 1) is a ligand that regulates T-cell activity. Since T cells have an important role during AVF maturation, we hypothesized that PD-L1 regulates T cells to control venous remodeling that occurs during AVF maturation. Approach and results: In the mouse aortocaval fistula model, anti-PD-L1 antibody (200 mg, 3×/wk intraperitoneal) was given to inhibit PD-L1 activity during AVF maturation. Inhibition of PD-L1 increased T-helper type 1 cells and T-helper type 2 cells but reduced regulatory T cells to increase M1-type macrophages and reduce M2-type macrophages; these changes were associated with reduced vascular wall thickening and reduced AVF patency. Inhibition of PD-L1 also inhibited smooth muscle cell proliferation and increased endothelial dysfunction. The effects of anti-PD-L1 antibody on adaptive venous remodeling were diminished in nude mice; however, they were restored after T-cell transfer into nude mice, indicating the effects of anti-PD-L1 antibody on venous remodeling were dependent on T cells. Regulation of PD-L1 activity may be a potential therapeutic target for clinical translation to improve AVF maturation.

Never again. Once used for cardiac catherization the radial artery cannot be used for CABG.

The use of the radial artery (RA) as a conduit in coronary artery bypass grafting (CABG) has been steadily increasing since the early 1990s and based on the most recent data may well become the standard of care for patients with multivessel coronary artery disease requiring multiple arterial grafts. The transradial access (TRA) approach for cardiac catherization has also increased steadily in use by interventional cardiologists owing to its reduction in bleeding and vascular complications when compared with the femoral approach and is now considered the preferred arterial access. However, prior use of TRA for cardiac catherization is a contraindication for the use of the RA for CABG because of high rates of structural damage to the vascular wall and potential for graft failure. In this issue of the Journal of Cardiac Surgery Clarke et al. examine the RA of two patients who had TRA for coronary angiography 8 and 12 years prior and note that both patients had chronic injury with dissection and obstruction of the lumen secondary to fibrosis suggesting that TRA causes long-term and irreversible damage rendering them unsuitable as conduits for CABG.

Adoption of electronic books in a higher education setting: an exploratory case study based on Diffusion of Innovation and Garner’s Hype Cycle paradigms

The purpose of this research was to examine the status of library users' adoption of e-books in line with Rogers's Diffusion of Innovation (DOI) theory and Gartner’s Hype Cycle (GHC) Model in the context of Fiji National University (FNU). The FNU Library introduced e-books to its user community in 2014. Purposively chosen 40 undergraduate students from the College of Business, Hospitality and Tourism Studies were selected as the sample to conduct in-depth interviews. The study revealed that the participants' e-book adoption habits were primarily divided among early adopters, early majority, and late majority. The results disclosed many factors that influence the adoption of e-books, such as familiarity with the technology, personal taste, exposure to trial access, use of preferred access devices and enthusiasm for reading. Findings indicate that e-books adoption of university undergraduates in line with the DOI and GHC paradigms has substantiated how the underpinning theories could help interpret the adoption of e-books in teaching and learning environment. Thus, this research will help librarians and educators develop a robust mechanism for better understanding the inherent status-quo of e-book usage in higher education institutions. These research findings will also help develop strategies that can significantly enhance universities' traditional teaching and learning performance with emerging technologies.

Perioperative neurologic outcomes of right versus left upper extremity access for fenestrated-branched endovascular aortic aneurysm repair

ObjectiveUpper extremity (UE) access is frequently used for fenestrated-branched endovascular aortic aneurysm repair (F-BEVAR), particularly for complex repairs. Traditionally, left-side UE access has been used to avoid crossing the arch and the origin of the supra-aortic vessels, which could potentially result in cerebral embolization and an increased risk of perioperative cerebrovascular events. More recently, right UE has been more frequently used as it is more convenient and ergonomic. The purpose of this study was to assess the outcomes and cerebrovascular events after F-BEVAR with the use of right- vs left-side UE access. MethodsDuring an 8-year period, 453 patients (71% male) underwent F-BEVAR at a single institution. UE access was used in more complex repairs. Left UE access was favored in the past, whereas right UE access is currently the preferred UE access side. Brachial artery cutdown was used in all patients for the placement of a 12F sheath. Outcomes were compared between patients undergoing right vs left UE access. End points included cerebrovascular events, perioperative mortality, technical success, and local access-related complications. ResultsUE access was used in 361 (80%) patients. The right side was used in 232 (64%) and the left side in 129 (36%) patients for the treatment of 88 (25%) juxtarenal, 135 (38%) suprarenal, and 137 (38%) thoracoabdominal aortic aneurysms. Most procedures were elective (94%). Technical success was achieved in 354 patients (98%). In-patient or 30-day mortality was 3.3%. Five (1%) perioperative strokes occurred in patients undergoing right UE access, of which three were ischemic and two were hemorrhagic. No transient ischemic attacks occurred perioperatively. Two hemorrhagic strokes were associated with permissive hypertension to prevent spinal cord ischemia. No perioperative strokes occurred in patients undergoing left UE access (P = .16). Overall, perioperative strokes occurred with similar frequency in patients undergoing UE (5, 1%) and femoral access only (1, 1%) (P = .99). Arm access-related complications occurred in 15 (5%) patients, 11 (4.8%) on the right side and 4 (6%) on the left side (P = .74). ConclusionsRight UE access can be used for F-BEVAR with low morbidity and minimal risk of perioperative ischemic stroke or transient ischemic attacks. In general, UE access is not associated with an increased risk of perioperative stroke compared with femoral access only. Tight blood pressure control is, however, critical to avoid intracranial bleeding related to uncontrolled hypertension.

Current Practice of Percutaneous Coronary Intervention in Patients With Coagulation Disorders.

Acute coronary artery disease represents the leading cause of death worldwide. Some studies have shown that coagulation disorders can play a protective role against ischemic heart disease, presumably due to hypocoagulable state and decrease thrombin formation. However, autopsy reports showed atherosclerotic lesions in some patients with hemophilia. Since the introduction of clotting factors and replacement therapies, the life expectancy of patients with coagulation disorders has increased significantly. As a result, the incidence of cardiovascular diseases became higher making their treatment more challenging. Door to balloon strategy applies in ST-elevation myocardial infarction (STEMI), and percutaneous coronary intervention should not be delayed. While in non-STEMI (NSTEMI) and unstable angina, a hematology consult is essential. Prophylactic coagulation factor replacement is crucial in these patients in order to avoid bleeding complications, but on the other hand, these factors were also associated with thrombotic complications. Historically, bare-metal stents were preferred over drug-eluting stents in view of the shorter duration of dual antiplatelets therapy (DAPT). Currently, some trials have demonstrated the safety of new-generation drug-eluting stents in patients with elevated bleeding risk, where DAPT use is limited to four weeks. The radial artery is the preferred access and was found to have less bleeding complications when compared to the femoral access. Anticoagulation with heparin is the safest in view of antidote availability and shorter half-life. Bivalirudin has also been used in some case reports, while GP2b3a inhibitors are usually avoided except in a high thrombus burden. Close peri procedural follow-up is important with patient education about symptoms of bleed. Carefully and individually tailored antithrombotic and factor replacement therapy is required to overcome these clinically challenging situations. Early screening for cardiovascular risk factors and considering early intervention and management might help to improve the general health status of this population and reduce morbidity.

Impact of preoperative exercise in not initially candidates to native arteriovenous fistulas.

Native autologous arteriovenous fistula (AVFn) is the preferred vascular access for hemodialysis due to its long term patency and low complication rate. A challenging limitation is the anatomical inability to perform AVFn and failure of maturation. Preoperative isometric exercise (PIE) can increase vascular calibers and improve the rate of distal AVF. However, it is unknown whether PIE might enhance the performance of AVFn in patients who are not initially candidates. A retrospective observational study was conducted over a population of 45 patients evaluated in vascular access clinic, 23 were not initially candidates for radiocephalic (NRC-AVF) and 22 were not candidates for autologous fistula at all (NA-AVF). They were assigned to perform PIE with handgrip device and revaluated. After 4-8 weeks of PIE, a AVFn was performed in 16 patients from NA-AVF group and a radiocephalic AVFn was performed in 21 patients from NRC-AVF group. Both groups experienced a significant and similar increase in venous caliber 0.91 ± 0.43 mm in NA-AVF versus 0.76 ± 0.47 mm in NRC-AVF (p = 0.336) and arterial caliber 0.18 ± 0.24 mm versus 0.18 ± 0.21 mm (p = 0.928), respectively. Nevertheless, primary failure rate was significantly higher in NA-AVF (n = 8, 50%) than in NRC-AVF group (n = 3, 14.3%) (p = 0.030). After 6 months, the fistula usability for dialysis was only 50% in NA-AVF, while 86.7% were dialyzed by fistula in NRC-AVF group (p = 0.038). PIE allowed the allocation of an AVFn in patients not initially candidates, but entailed a high rate of maturation failure. Patients not candidates to radiocephalic AVF benefited from PIE and preserved a long term usability of AVF for dialysis.

Availability and Accessibility of Primary Care for the Remote, Rural, and Poor Population of Indonesia.

Background: Adopting Universal Health Coverage for implementation of a national health insurance system [Jaminan Kesehatan Nasional (JKN)/Badan Penyelenggara Jaminan Sosial or the Indonesian National Social Health Insurance Scheme (BPJS)] targets the 255 million population of Indonesia. The availability, accessibility, and acceptance of healthcare services are the most important challenges during implementation. Referral behavior and the utilization of primary care structures for underserved (rural/remote regions) populations are key guiding elements. In this study, we provided the first assessment of BPJS implementation and its resulting implications for healthcare delivery based on the entire insurance dataset for the initial period of implementation, specifically focusing on poor and remote populations.Methods: Demographic, economic, and healthcare infrastructure information was obtained from public resources. Data about the JKN membership structure, performance information, and reimbursement were provided by the BPJS national head office. For analysis, an ANOVA was used to compare reimbursement indexes for primary healthcare (PHC) and advanced healthcare (AHC). The usage of primary care resources was analyzed by comparing clustered provinces and utilization indices differentiating poor [Penerima Bantuan Iur (PBI) membership] and non-poor populations (non-PBI). Factorial and canonical discrimination analyses were applied to identify the determinants of PHC structures.Results: Remote regions cover 27.8% of districts/municipalities. The distribution of the poor population and PBI members were highly correlated (r2 > 0.8; p < 0.001). Three clusters of provinces [remote high-poor (N = 13), remote low-poor (N = 15), non-remote (N = 5)] were identified. A discrimination analysis enabled the >82% correct cluster classification of infrastructure and human resources of health (HRH)-related factors. Standardized HRH (nurses and general practitioners [GP]) availability showed significant differences between clusters (p < 0.01), whereas the availability of hospital beds was weakly correlated. The usage of PHC was ~2-fold of AHC, while non-PBI members utilized AHC 4- to 5-fold more frequently than PBI members. Referral indices (r2 = 0.94; p < 0.001) for PBI, non-PBI, and AHC utilization rates (r2 = 0.53; p < 0.001) were highly correlated.Conclusion: Human resources of health availability were intensively related to the extent of the remote population but not the numbers of the poor population. The access points of PHC were mainly used by the poor population and in remote regions, whereas other population groups (non-PBI and non-Remote) preferred direct access to AHC. Guiding referral and the utilization of primary care will be key success factors for the effective and efficient usage of available healthcare infrastructures and the achievement of universal health coverage in Indonesia. The short-term development of JKN was recommended, with a focus on guiding referral behavior, especially in remote regions and for non-PBI members.

Effect of far infrared therapy on arteriovenous fistula maturation, survival and stenosis in hemodialysis patients, a randomized, controlled clinical trial: the FAITH on fistula trial

BackgroundAn arteriovenous fistula (AVF) is the preferred vascular access for hemodialysis treatment. After creation many of the AVFs will never mature or if functioning will need an intervention within 1 year due to an AVF stenosis. Studies investigating possible therapies that improves the AVF maturation and survival are scarce. Far infrared therapy (FIR) has shown promising results. In minor single centre and industry supported trials FIR has shown improved AVF maturation and survival. There is a need of a randomized multicentre controlled trial to examine the effect of FIR on the AVF maturation and survival and to explore the possible AVF protective mechanism induced by the FIR treatment.MethodsThis investigator initiated, randomized, controlled, open-labeled, multicenter clinical trial will examine the effect of FIR on AVF maturation in patients with a newly created AVF (incident) and AVF patency rate after 1 year of treatment in patients with an existing AVF (prevalent) compared to a control group. The intervention group will receive FIR to the skin above their AVF three times a week for 1 year. The control group will be observed without any treatment. The primary outcome for incident AVFs is the time from surgically creation of the AVF to successful cannulation. The primary outcome for the prevalent AVFs is the difference in number of AVFs without intervention and still functioning in the treatment and control group after 12 months. Furthermore, the acute changes in inflammatory and vasodilating factors during FIR will be explored. Arterial stiffness as a marker of long term AVF patency will also be examined.DiscussionFIR is a promising new treatment modality that may potentially lead to improved AVF maturation and survival. This randomized controlled open-labelled trial will investigate the effect of FIR and its possible mechanisms.Trial registrationClinicaltrialsgov NCT04011072 (7th of July 2019).

The Effect of Brachial Plexus Regional Block on Autologous Arteriovenous Fistula and Arteriovenous Graft Outcomes: A Prospective Study

Primary arteriovenous fistula (AVF) is the preferred vascular access for hemodialysis, due to having the best long-term primary patency rate, fewest interventions, and lowest incidence of long-term adverse events when compared with other types of vascular access. A vein diameter >3 mm is always preferred in AVF creation. The use of ultrasound-guided regional block has been increasingly utilized in hemodialysis access creation procedures. We aim to evaluate how regional anesthesia might alter the surgical decision during a vascular access procedure by switching the surgical plan from arteriovenous graft (AVG) to AVF.

Stretching the boundaries: suitability of an arteriovenous fistula in elderly patients on hemodialysis-a northern India experience.

Considering various factors, such as multiple co-morbidities, unsuitable vessels for access creation, non-maturation, vascular calcifications, the outcome of arteriovenous fistula (AVF) in the elderly population, may not be similar to the younger people. Our study aims to analyze the outcomes of AVF in elderly patients (> 65year). It was a prospective observational study. Patients of more than 65years of age in whom AVF was created from January 2012 to December 2015 were included in the study. These patients were followed up for 4years. The primary endpoint of our study was to assess primary and secondary patency rates. A total of 450AVFs were included in the study. The mean age was 68.5years. The most common site of AVF was radiocephalic (RCAVF) in 70% (n = 315), brachiocephalic (BCAVF) in 24% (n = 108) and basilic vein transposition (BVT) in 6% (n = 27). At 48months, the primary patency rate of RCAVF, BCAVF, and BVT was 55%, 61.6%, and 60.4%, respectively. The commonest cause of access failure was thrombosis followed by non-maturation. AVF remains the preferred vascular access for hemodialysis even in the elderly population. Failure to mature and thrombosis continue to be a concern with AVF. Location of the AV access does not seem to impact the long-term patency.

Transcatheter aortic valve implantation via the left axillary artery route in a patient with a permanent pacemaker: The first transaxillary artery route experience with a Meril's MyvalTM transaortic valve in Turkey.

In light of because of its improved procedural and clinical success, transcatheter aortic valve implantation (TAVI) has become a significant alternative treatment option to surgery in patients with severe aortic valve stenosis. However, TAVI has its own contraindications and limitations, such as access route problems with transfemoral (TF) access being the safest and most widely used route. However, in patients in whom this route is unsuitable, axillary artery is the preferred alternative access route. Although TAVI valves are not licensed for axillary artery access, off-label use of balloon-expandable (Edwards Lifesciences, Irvine, CA, USA) and self-expandable (Evolute/CoreValve systems, Medtronic, Dublin, Ireland, as well as the Lotus valve system Boston Scientific Inc., Marlborough, MA, USA) valves have been reported. The Meril’s Myval™ transaortic valve is a new-generation transaortic balloon-expandable valve, and transaxillary TAVI with this valve has not been reported previously. Here, we report our experience with a Meril’s Myval™ valve in a patient with severe aortic stenosis, peripheral artery disease, and a permanently implanted pacemaker.

Adjuvant heparinization before manipulation of artery reduces early failure in primary arteriovenous fistula for end-stage renal disease patients.

Arteriovenous fistula (AVF) is the most preferred vascular access for hemodialysis patients, and early failure of AVF is one of the most avoidable complications of this procedure. We retrospectively evaluated whether adjuvant systemic heparinization just before arterial manipulation could reduce early failure of primary AVF. Three hundred and fifty-six patients with end-stage renal failure who underwent primary AVF surgery from April 2009 to September 2020 were enrolled in this study. The patients were divided into two groups based on whether they received adjuvant heparinization or not. Patient backgrounds, frequency of early AVF failure, and bleeding events were compared between the two groups. Multivariate Cox regression analysis identified risk factors for early AVF failure. Early failure of AVF was observed in only 2 of 157 patients (1.2%) in the adjuvant group, and the incident was significantly lower than observed in the non-adjuvant group, i.e., 17 of 199 patients (8.5%) (p = 0.002). Bleeding events were not significantly different between the two groups. Seven of 157 patients (4.5%) in the adjuvant group and 7 of 199 patients (3.5%) in the non-adjuvant group experienced bleeding events (p = 0.785). Female sex, use of steroids, hypoalbuminemia, venous stenosis in pre-surgical evaluation, arterial spasm in the perioperative period, new-onset venous stenosis after AVF anastomosis, technical failure of surgery, no early cannulation after surgery, and non-adjuvant heparinization were related to early AVF failure in the multivariate regression analysis. Adjuvant systemic heparinization therapy just before arterial manipulation reduced early failure of primary AVF without increasing bleeding events.

ENDOVASCULAR PROCEDURES FOR LOWER LIMB PERIPHERAL ARTERIAL DISEASE IN AN AMBULATORY UNIT.

To analyse the safety and outcomes of endovascular procedures in an ambulatory practice. Data were collected from a cohort of patients admitted in an ambulatory unit for an endovascular procedure for lower limb (LL) arterial occlusive disease during a one year period. A total of 168 procedures were carried out in 134 patients. Patients' mean age was 67 (39-91) years and 78% were male. Most patients presented with lower limb ulcer or gangrene (43%) or disabling claudication (40%). Most frequent comorbidities included hypertension (75.4%), dyslipidemia (72.4%) and diabetes mellitus (57.5%). The preferred vascular access for the procedures was the common femoral artery (52%), superficial femoral artery (24%) and humeral artery (21%). Global complication rate was 19% but only one major, non-fatal complication was identified. The most common complication was arterial dissection (8.3%), none compromising blood flow. One-year amputation rate was 6.7%, and one-year mortality was 3.0%. Factors significantly associated with procedure complications were female sex, hypertension and dyslipidemia. Ambulatory endovascular procedures for PAD are safe and effective in selected patients. Both the low rate and low severity of complications make them an attractive option in the prospect of diminishing the burden of these patients on the health-care system while improving patient comfort.

Large device to device communication network including airborne drones for emergency scenarios

AbstractIn the case of emergency scenarios communication infrastructure might be destroyed, impairing communication abilities in the disaster area. In such situation device‐to‐device (D2D) communication networking plays an essential role to overcome the communication loss. To provide a reliable communication network, D2D devices are combined with airborne drones. The D2D devices provide a relay service while being able to transmit their own data. The airborne drones offer additional relay functionality and provide considerably reduced latency compared with D2D communication networks without any airborne drones. In this article, we will illustrate a large dynamic communication network (LDCN) and demonstrate its feasibility for even more than 64 000 D2D communication devices in the case of realistic channel conditions including path loss and fading. It will be shown that the illustrated LDCN is truly infrastructure‐less, that is, no infrastructure or backbone or base station functionality need to be reinstalled. Therefore, the airborne drones do not take over any coordination services. The illustrated LDCN has a simple packet switching architecture and since all communication is localized it is robust and fully flexible. In addition, no specific radio interface or preferred multiple access scheme such as code division multiple access or time division multiple access are required.