Predialysis nephrology care amongst Palestinian hemodialysis patients and its impact on initial vascular access type.

Referral time for end-stage renal disease (ESRD) patients to nephrologists and initial vascular access method are considered significant factors that impact health outcomes at the time of hemodialysis (HD) initiation. Native arteriovenous fistula (AVF) is strongly recommended as initial access. However, little is known about the referral rate among ESRD receiving HD in Palestine and its correlation with AVF creation. In Ramallah Hemodialysis Center, we investigated the pre-dialysis nephrology care and AVF usage in 156 patients. Type of access at HD initiation was temporary central venous catheter (CVC) in 114 (73%), tunneled hemodialysis catheter (TDC) in 21 (13%) and AVF in 21 (13%). Out of all participants, 120 (77%) were seen by nephrologist prior to dialysis. Of the participants who initiated dialysis with a CVC, 36 (31%) had not received prior nephrology care. All participants who initiated dialysis with functional AVF had received prior nephrology care. Patients who were not seen by a nephrologist prior to HD initiation had no chance at starting HD with AVF, whereas 17% of those who had nephrology care >12 months started with AVF. In conclusion, a relatively large percentage of Palestinian HD patients who were maintained on HD did not have any predialysis nephrology care. In addition, patients who received predialysis nephrology care were significantly more likely to start their HD through AVF whereas all those without predialysis nephrology care started through CVC. More in-depth national studies focusing on improving nephrology referral in ESRD patients are needed to increase AVF utilization.

Outcomes of initial hemodialysis vascular access in patients initiating dialysis with a tunneled catheter.

BACKGROUND: Our aim was to determine factors that influence time to removal of tunneled hemodialysis catheter (THC), probability of repeat vascular access creation, and time to repeat vascular access. METHODS: The Optum Clinformatics Data Mart claims database was queried from 2011 to 2017 for patients who initiated hemodialysis with a THC. Time from initial arteriovenous fistula (AVF)/graft (AVG) to THC removal and time to repeat AVF/AVG were analyzed using Cox proportional hazards. The likelihood of repeat AVF/AVG was analyzed using logistic regression. RESULTS: A total of 8941 vascular access met the inclusion criteria: 6913 (77%) AVF and 2028 (23%) AVG. Median follow-up was 595 days among AVF patients (range, 1-2543 days) and 579 days among AVG patients (range, 1-2529 days). Patients undergoing AVF were younger, more likely to be male, of white race, and obese. Patients undergoing AVF were also slightly less likely to have diabetes, cardiac arrhythmia, congestive heart failure, and peripheral vascular disease than patients undergoing AVG. At 90 days and at 180 days after index access creation, significantly more patients who underwent index AVG had their THC removed compared with patients who underwent index AVF. By day 365, 78% of patients in both AVF and AVG had their THC removed. A total of 2550 (28.5%) patients underwent a repeat vascular access creation during the follow-up period: 30% of index AVF and 24% of index AVG. At 90 days, 180 days, and 365 days, significantly more patients in the index AVF group underwent a repeat vascular access creation than those in the index AVG group. Multivariate analysis demonstrated a significant interaction between vascular access type and age ≥70 years (P < .001) for time to THC removal, likelihood of repeat vascular access, and time to repeat vascular access. In the age <70 group, patients who underwent AVG were 60% more likely to have a shorter time to THC, had a 50.4% lower odds of repeat vascular access, and were 47% more likely to have a longer time to repeat vascular access compared with patients who underwent index AVF. In the age ≥70 group, patients who underwent AVG were 98% more likely to have a shorter time to THC removal, had 69.7% lower odds of repeat vascular access, and were 66% more likely to have a longer time to repeat vascular access. CONCLUSIONS: Creation of AVG vs AVF significantly decreases the time to THC removal in dialysis-dependent patients, with a larger difference in patients aged ≥70 vs <70. Initial AVG was associated with lower odds of repeat vascular access and longer time to repeat vascular access. These results suggest that the dictum of "fistula first" is not appropriate for all patient populations and supports judicious use of AVG in achieving the more recent shift toward "catheter last."

Anatomy Revisited: Hemodialysis Catheter Malposition into the Chest.

In most situations, central catheters are implanted in the right jugular vein as initial access for hemodialysis. However, after repeated punctures, the proximal vessels become stenosed and thrombosed and misplacement is likely to occur. Correct catheter position in the vein can be easily ascertained with X-ray or cross-sectional CT imaging. In this report, we describe the case of a 77-year-old patient on chronic hemodialysis via catheter due to arteriovenous fistula dysfunction. We placed a cuffed-tunneled hemodialysis catheter in the left internal jugular vein. Malpositioning of the catheter led to perforation of the great veins and migration of the catheter tip into the chest. It is important to be aware of the risk of potential incorrect positioning of dialysis catheters. Due to the stenosis and fragility of the vessel wall, perforation may occur. In cases of doubt, correct placement of large-bore catheters via the internal jugular vein should be verified by means of appropriate imaging before hemodialysis is performed.

The predictive value of systemic inflammatory markers in 902 patients with tunneled hemodialysis catheter.

AIM: This study aimed to assess the predictive role of neutrophil-to-lymphocyte ratio, platelet-to-lymphocyte ratio, lymphocyte-to-monocyte ratio, and mean platelet volume, on catheter survival in chronic hemodialysis patients, analyzing both infectious and non-infectious complications. METHODS: A retrospective analysis encompassed 1279 tunneled catheter insertion procedures involving 902 patients between March 2014 and October 2018. Patients were categorized into two main groups: (i) initial placement and (ii) exchange. The exchange group was further stratified into four subgroups: infection, dysfunction, displacement, and transitioning temporary hemodialysis catheters to long-term ones. Hematologic ratios were calculated from baseline hemogram data, including neutrophil, lymphocyte, monocyte, and platelet counts, while mean platelet volume was derived from the same hemogram. RESULTS: The patients in the exchange group displayed significantly higher lymphocyte and monocyte values (p < 0.001), while lower values were noted for neutrophil-lymphocyte ratio and platelet-lymphocyte ratio (p < 0.001). The transition group displayed higher monocyte values and lower mean platelet volume and lymphocyte-monocyte ratio values (p < 0.05). In the infection-related exchange subgroup, higher neutrophil count, mean platelet volume, neutrophil-lymphocyte ratio, and platelet-lymphocyte ratio values were observed compared to other groups (p < 0.05). Cases related to catheter dysfunction exhibited increased lymphocyte-monocyte ratio but lower neutrophil, monocyte, neutrophil-lymphocyte ratio, and platelet-lymphocyte ratio values (p < 0.05). CONCLUSION: This study highlights the interest of specific inflammatory markers, particularly monocytes, neutrophil-lymphocyte ratio, and platelet-lymphocyte ratio, in the management of tunneled catheters, notably in patients undergoing exchanges. However, cut-off values, essential for constructing management algorithms, are currently lacking, and prospective multicenter studies are needed for further elucidation.

Catheter related atrial thrombus caused by Abiotrophia defectiva: A case series and review of literature.

Catheter related atrial thrombus (CRAT) is a devastating complication associated with tunneled hemodialysis catheter. Abiotrophia defectiva is a rare fastidious pathogen implicated predominantly in culture negative infective endocarditis. Here we report three cases of CRAT in maintenance hemodialysis patients with variable clinical presentation caused by Abiotrophia defectiva. Video assisted thoracoscopic retrieval of atrial thrombus is a novel technique which is scarcely reported in medical literature for surgical management of large atrial thrombus. Our cases were managed by timely administration of antibiotics and anticoagulants followed by surgical retrieval of atrial thrombus with removal of tunneled dialysis catheter. This case series illustrates the importance of prompt diagnosis, appropriate anticoagulation with antibiotics, and mini-invasive surgical removal of atrial thrombus for the management of CRAT.

One patient, two malpositioned hemodialysis catheters, (hepatic vein and ascending lumbar vein), no fluoroscopy.

Cuffed-tunneled hemodialysis catheter (CTHC) application via the femoral vein is a safe and effective alternative when peripheral vascular routes are exhausted for hemodialysis in patients with end-stage renal disease. Also, imaging methods have become more important for the diagnosis or prevention of the possible complications that may develop during or after catheter placements. Here, we present a case of hemodialysis catheter dysfunction due to the insertion of a CTHC tip into the hepatic vein, and into the left ascending lumbar vein at the next attempt. We think that the use of fluoroscopy, whether in the first catheter intervention or catheter change, is extremely important in preventing possible complications that may develop, or detecting them as soon as possible.

CMS ESRD quality incentive program has not improved patient dialysis vascular access.

PURPOSE: Over 468,000 patients in the United States use hemodialysis to manage End Stage Renal Disease (ESRD). The purpose of this study was to determine whether the dialysis access Clinical Performance Measures (CPMs) of Centers for Medicare & Medicaid Services (CMS) ESRD Quality Incentive Program (QIP) have increased arteriovenous fistula (AVF) rates and decreased long-term tunneled hemodialysis catheter (TDC) rates among hemodialysis patients in United States. METHODS: Retrospective observational study: evaluated reported AVF and long-term TDC rates of 4804 dialysis facilities which reported dialysis access data as part of the ESRD QIP from Payment Year (PY) 2014-2020. Facilities were also sorted by specific additional criteria to examine disparities in dialysis access. RESULTS: Mean AVF rates of included facilities increased from 63.7% in PY 2014 to 67.2% in PY 2016 (p < 0.05), did not change in PY 2017 (p > 0.05), and declined significantly in PY 2018-2020 to 64.1% in PY 2020, near AVF rates at the inception of program. Long-term TDC rates decreased from 10.4% in PY 2014 to 9.88% in PY 2015 (p < 0.05), then increased in PY 2015-PY 2020 to rates higher than at the inception of program, at 11.8% in PY 2020 (p < 0.05). Facilities serving majority Black ZIP Code Tabulation Areas (ZCTAs) or ZCTAs with median income <$45,000 achieved significantly lower AVF rates (p < 0.05) with no significant difference in long-term TDC rates (p > 0.05). AVF rates correlated positively and long-term TDC rates correlated negatively with star rating of facilities (p < 0.05). CONCLUSION: As one of the first financial QIPs in healthcare, the ESRD QIP has not achieved the stated goals of the CMS to increase AVF access rates above 68% and reduce long-term TDC clinical rates below 10%. Systemic disparities in race, geographic region, economic status, healthcare access, and education of providers and patients prevent successful attainment of goal metrics.

The rapid atrial swirl sign for ultrasound-guided tip positioning of antegrade-tunneled hemodialysis catheters: A cross-sectional pilot study.

BACKGROUND: We have previously reported that the rapid atrial swirl sign (RASS) is an accurate and safe procedure for ultrasound (US)-guided tip positioning of retrograde-tunneled hemodialysis catheters (HDCs). However, application of RASS for placement of antegrade HDCs has not been investigated yet. Therefore, we here report our first experience of applying RASS for US-guided tip positioning of antegrade-tunneled HDCs. METHODS: We performed a cross-sectional study to assess the feasibility of applying the RASS for US-guided tip positioning of antegrade-tunneled HDCs. We included a total number of 15 antegrade-tunneled HDC insertions in 13 patients requiring placement of a HDC for the temporary or permanent treatment of ESKD in a single-center, cross-sectional pilot study. RESULTS: The overall success rate of applying the RASS for US-guided tip positioning of antegrade-tunneled HDCs was 15/15 (100%) confirmed by portable anterior-posterior chest radiography, with no major adverse events after HDC insertions. In addition, this insertion technique demonstrated optimal HDC flow without any observed malfunction. CONCLUSION: This study investigated the efficacy of the RASS for US-guided tip positioning of antegrade-tunneled HDCs in patients with ESKD. Application of the RASS for US-guided tip positioning is an accurate and safe procedure for proper placement of antegrade-tunneled HDCs.

Genes predisposing tunneled catheter thrombosis in hemodialysis patients.

Background: This study aims to investigate the association of genes predisposing thrombophilia with tunneled catheter thrombosis in hemodialysis patients. Methods: Between October 2018 and December 2020, we compared the frequencies of genetic polymorphisms causing thrombophilia, including prothrombin G20210A, factor V Leiden, methylene tetrahydrofolate reductase (MTHFR) C677T, MTHFR A1298C, plasminogen activator inhibitor (PAI), factor XIII V34L and clinical characteristics of 52 patients with a history of 2 tunneled2 tunneled catheter thrombosis occlusions within a year (Group 1; 24 males, 28 females; mean age: 62±8.9 years; range, 45 to 77 years), 52 patients who underwent their first tunneled catheter thrombosis insertion (Group 2; 29 males, 23 females; mean age: 63±15.2 years; range, 22 to 87 years), and 51 healthy controls (Group 3; 26 males, 25 females; mean age: 34±9.2 years; range, 19 to 54 years). Results: Groups 1 and 2 carried the MTHFR A1298C (p=0.048) and compound heterozygous MTHFR A1298C and C677T (p=0.048) polymorphisms more frequently than Group 3. However, subgroup analysis results were not statistically significant. The other polymorphisms were distributed similarly in all three groups. The MTHFR polymorphisms had a weak effect on tunneled hemodialysis catheter thrombosis in neural network analysis. Conclusion: Our study results indicated that there was a concomitance of MTHFR polymorphisms with hemodialysis-dependent chronic kidney disease. The MTHFR A1298C and compound heterozygous MTHFR polymorphisms may be associated with tunneled hemodialysis catheter thrombosis. Thrombophilia gene screening may be recommended in hemodialysis patients undergoing tunneled hemodialysis catheter thrombosis at least twice in a year.

Acute upper limb ischemia as a complication of tunneled hemodialysis catheter placement via the right internal jugular vein.

Arterial injury during internal jugular vein cannulation can cause devastating complications such as stroke, hematoma, hemothorax, pseudoaneurysm, AV fistula, or even death. Acute upper limb ischemia caused by inadvertent arterial puncture during internal jugular vein cannulation has been rarely reported. The present report describes the case of a patient who experienced right upper limb ischemia caused by subclavian artery thrombosis developed during attempted placement of a tunneled hemodialysis catheter via the right internal jugular vein. The patient underwent an emergency brachial embolectomy and recovered uneventfully.

Determinants of Tunneled Hemodialysis Catheter Implantation Time by Ultrasound Guidance: A Single-Center Cross-Sectional Study.

BACKGROUND: We have previously reported that the ultrasound (US)-guided tip positioning is an accurate and safe procedure for placement of retrograde- and antegrade-tunneled hemodialysis catheters (HDCs). However, determinants of tunneled hemodialysis catheter implantation time by using US guidance have not been described yet. Therefore, we here report a comparative analysis to identify determinants of implantation time for retrograde- and antegrade-tunneled HDCs placement by US guidance. METHODS: We performed a cross-sectional study to compare implantation time for US-guided tip positioning of retrograde- and antegrade-tunneled HDCs. We included a total number of 47 tunneled HDC insertions, including 23 retrograde tunneled and 24 antegrade-tunneled HDCs in patients requiring placement of an HDC for the temporary or permanent treatment of end-stage kidney disease (ESKD) in a single-center, cross-sectional pilot study. RESULTS: We show that clinical and laboratory parameters did not differ between retrograde- and antegrade-tunneled HDC implantations. There was a tendency for shorter implantation time in antegrade-tunneled HDCs, although not statistically significant. Finally, we identified an independent inverse association between body weight (BW) and platelet counts with HDC implantation time specifically in antegrade-tunneled HDCs. CONCLUSION: In this study, we identified determinants for tunneled HDC implantation time that might be relevant for patients and interventionists.

Hereditary thrombophilia and thrombosis of tunneled hemodialysis catheters: A single center study.

Introduction: Vascular access thrombosis increases the risk of mortality and morbidity in end-stage renal disease (ESRD) patients on hemodialysis (HD). This study aimed to evaluate hereditary thrombophilia factors in HD patients and its association with tunneled cuffed catheters' thrombosis. Methods: In this cross-sectional study, 60 consecutive patients with ESRD on HD with tunneled cuffed catheters were selected. Inherited thrombophilia factors (Anti-thrombin III, Protein C, Protein S, and Factor V Leiden) were measured and the patients were followed for 3 months to evaluate the incidence of catheter-related thrombosis. The association between these factors and catheter thrombosis was assessed. Results: The mean age of patients was 60.30 ± 8.69 years. Forty-seven patients (78.30%) were female and thirteen patients (21.70%) were male. The most common cause of ESRD was diabetes mellitus (41.67%). The most catheter site was the right internal jugular vein (55%). There were 22 (36.67%) and 8 (13.33%) cases of thrombosis and mortality, respectively. The association between hereditary thrombophilia factors and catheter thrombosis was not statistically significant (P > 0.05). Conclusion: In this small group of our patients, the frequency of hereditary thrombophilia was not significantly different between those with and without thrombosis of tunneled HD catheter.

Nephronophthisis and central veins abnormalities: A case report.

Patients with genetic disorders are potentially more susceptible to present vascular abnormalities compared to the general population. For these patients, unusual difficulties could appear during a CVC placement procedure that could lead to major complications if venous abnormalities are undiagnosed. Ultrasound and fluoroscopy guidance should be used routinely for all patients in order to avoid complications and catheter misplacement.

The Rapid Atrial Swirl Sign for Ultrasound-Guided Tip Positioning of Retrograde-Tunneled Hemodialysis Catheters: A Cross-Sectional Study from a Single Center.

BACKGROUND: Chronic kidney disease (CKD) is a common medical problem in patients worldwide, with an increasing prevalence of patients with end-stage kidney disease (ESKD) requiring renal replacement therapy (RRT). In patients requiring RRT for more than two weeks or those who develop ESKD, tunneled hemodialysis catheter (HDC) insertion is preferred, based on a lower risk for infectious complications. While the efficacy of ultrasound (US)-guided tip positioning in antegrade-tunneled HDCs has previously been shown, its application for the insertion of retrograde-tunneled HDCs has not been described yet. This is especially important, since the retrograde-tunneled technique has several advantages over the antegrade-tunneled HDC insertion technique. Therefore, we here report our first experience of applying the rapid atrial swirl sign (RASS) for US-guided tip positioning of retrograde-tunneled HDCs. METHODS: We performed a cross-sectional study to assess the feasibility of applying the RASS for US-guided tip positioning of retrograde-tunneled HDCs. We performed a total number of 24 retrograde-tunneled HDC insertions in 23 patients (requiring placement of a HDC for the temporary or permanent treatment of ESKD) admitted to our Department of Nephrology and Rheumatology at the University Medical Center Göttingen, Germany. RESULTS: The overall success rate of applying the RASS for US-guided tip positioning of retrograde-tunneled HDCs was 24/24 (100%), with proper tip position in the right atrium in 18/23 (78.3%), or cavoatrial junction in 5/23 (21.7%) when RASS was positive and improper position when RASS was negative in 1/1 (100%), confirmed by portable anterior-posterior chest radiography, with only minor post-procedural bleeding in 2/24 (8.3%). In addition, this insertion technique allows optimal HDC flow, without any observed malfunction. CONCLUSION: This is the first study to investigate the efficacy of the RASS for US-guided tip positioning of retrograde-tunneled HDCs in patients with ESKD. Application of the RASS for US-guided tip positioning is an accurate and safe procedure for the proper placement of retrograde-tunneled HDCs.

Confusing radiographic appearance of a central venous split-tip hemodialysis catheter.

Long-term cuffed hemodialysis catheters are being increasingly used in the management of patients with chronic kidney disease. These tunneled catheters are available in different types and characteristics. Patients undergo imaging, primarily chest radiographs to confirm the position of the catheter tip. It is essential to be aware of the normal imaging appearances of these catheters as they may simulate pathological appearance due to the shape of their tips. This knowledge will help avoid misdiagnosis and unnecessary medical interventions.

Survey of non-tunneled temporary hemodialysis catheter clinical practice and training.

BACKGROUND: Nephrologists are placing fewer non-tunneled temporary hemodialysis catheters. Requiring competence for nephrology fellow graduation is controversial. METHODS: Anonymous, online survey of all graduates from a single, military nephrology training program (n = 81; 1985-2017) and all US Nephrology program directors (n = 150). RESULTS: Graduate response and completion rates were 59% and 100%, respectively; 93% agreed they had been adequately trained; 58% (26/45) place non-tunneled temporary hemodialysis catheters, independent of academic practice or time in practice, but 12/26 did ⩽5/year and 23/26 referred some or all. The most common reason for continuing non-tunneled temporary hemodialysis catheter placement was that it is an essential emergency procedure (92%). The single most significant barrier was time to do the procedure (49%). Program director response and completion rates were 50% and 79%, respectively. The single most important barrier to fellow competence was busyness of the service (36%), followed by disinterest (21%); 55% believed that non-tunneled temporary hemodialysis catheter insertion competence should be required, with 81% indicating it was an essential emergency procedure. The majority of graduates and program directors agreed that simulation training was valuable; 76% of programs employ simulation. Graduates who had simulation training and program directors with ⩽20 years of practice were significantly more likely to agree that simulation training was necessary. CONCLUSION: Of the graduate respondents from a single training program, 58% continue to place non-tunneled temporary hemodialysis catheters; 55% of program directors believe non-tunneled temporary hemodialysis catheter procedural competence should be required. Graduates who had non-tunneled temporary hemodialysis catheter simulation training and younger program directors consider simulation training necessary. These findings should be considered in the discussion of non-tunneled temporary hemodialysis catheter curriculum requirements.

Surgical technique of placement of an external jugular tunneled hemodialysis catheter in a large pig model.

BACKGROUND: Currently, there is insufficient knowledge about the surgical anatomy and surgical techniques in large animals that can be used to test medical devices designed for human use. We encountered this problem in our study requiring the placement of jugular vein, tunneled, cuffed hemodialysis catheter in 70 kg pigs. Despite the operator's extensive expertise in placing tunneled hemodialysis catheters in humans, the important differences in anatomy made the procedure and choosing the appropriate catheter length challenging. METHODS: The following article describes the anatomy and our technique for the placement of tunneled hemodialysis catheter in the pig model. RESULTS: We consider our surgical technique to be sound because in all animals the catheters were placed in the desired location, the procedures were well tolerated by the animals, and there were no immediate or late complications. CONCLUSION: We present our experience to help other researchers who might encounter the same problem.

Tunneled Hemodialysis Catheter-associated Right Atrial Thrombus Presenting with Septic Pulmonary Embolism.

Tunneled hemodialysis (HD) catheter-associated right atrial thrombus (CRAT) is an uncommon complication with significant morbidity. We report the case of a patient undergoing HD through tunneled venous catheter who presented with catheter dysfunction and sepsis and was diagnosed to have CRAT with septic embolism. CRAT formation has a significant association with catheter-related infection. The need for early diagnosis and various treatment options for this entity are highlighted.

Availability of right femoral vein as a route for tunneled hemodialysis catheterization.

PURPOSE: This study was performed to investigate the primary patency rate and catheter-related problems associated with use of the femoral vein as a route for tunneled hemodialysis catheterization compared with those of the right internal jugular vein as the first-choice route in patients undergoing maintenance hemodialysis. PATIENTS AND METHODS: Twenty-two patients underwent placement of indwelling tunneled hemodialysis catheters in the right internal jugular vein as the first option for maintenance hemodialysis, and 20 patients underwent placement in the right femoral vein as the second option. The primary patency rate of the catheters and catheter-related problems at 1, 3, 6, and 12 months after placement were investigated. RESULTS: The 1-, 3-, 6-, and 12-month primary patency rates of the tunneled hemodialysis catheters in the right internal jugular vein were 95.5%, 95.5%, 81.3%, and 58.3%. The primary patency rates of the catheters in the right femoral vein were 95.0%, 89.5%, 86.7%, and 66.7%. There were no statistically significant differences in the primary patency rates at 1, 3, 6, and 12 months or in catheter-related problems between the right internal jugular vein and right femoral vein. CONCLUSION: The primary patency rate and catheter-related problems of indwelling tunneled hemodialysis catheters placed in the right femoral vein were not different from those in the right internal jugular vein in patients undergoing maintenance hemodialysis. These results suggest that the right femoral vein might be a useful option for placement of indwelling tunneled hemodialysis catheters in patients undergoing maintenance hemodialysis.

Practical Aspects of Nontunneled and Tunneled Hemodialysis Catheters.

Nontunneled hemodialysis catheters (NTHCs) are typically used when vascular access is required for urgent renal replacement therapy. The preferred site for NTHC insertion in acute kidney injury is the right internal jugular vein followed by the femoral vein. When aided by real-time ultrasound, mechanical complications related to NTHC insertion are significantly reduced. The preferred site for tunneled hemodialysis catheters placement is the right internal jugular vein followed by the left internal jugular vein. Ideally, the catheter should be inserted on the opposite side of a maturing or planned fistula/graft. Several dual-lumen, large-diameter catheters are available with multiple catheter tip designs, but no one catheter has shown significant superior performance.

En situation d'insuffisance rénale aigüe, les cathéters de dialyse non tunnelisés sont utilisés lorsqu'un accès vasculaire est requis de façon urgente pour entreprendre un traitement de suppléance de la fonction rénale. L'implantation de ce type de cathéter se fera préférablement dans la veine jugulaire interne droite sinon dans la veine fémorale. Il est possible de réduire de façon significative les complications mécaniques liées à son insertion en suivant la procédure par échographie. La veine jugulaire interne droite constitue également le site privilégié pour l'insertion d'un cathéter de dialyse tunnelisé. Toutefois, dans ce cas, le deuxième choix se portera sur la veine jugulaire interne gauche plutôt que sur la veine fémorale. Dans tous les cas, l'insertion du cathéter devra se faire du côté opposé à une fistule en cours de maturation, ou d'une fistule ou d'une greffe anticipée. De nombreux modèles de cathéters de grand diamètre, à double lumière et à pointes variées sont disponibles, mais aucun d'eux n'a démontré de performance supérieure à l'usage.