ASDIN white paper: Assessment and management of hemodialysis access-induced distal ischemia by interventional nephrologists

Proximalization of arteriovenous inflow as native loop utilizing the upper arm basilic and forearm cephalic veins for the treatment of hemodialysis access induced hand ischemia

BACKGROUND

Up to 10% of hemodialysis patients with an arteriovenous fistula (AVF) suffer hemodialysis access induced distal ischemia (HAIDI). We report a treatment option of HAIDI by proximalization of arterial inflow (PAI) to the axillary artery as native upper arm loop and salvaging the matured forearm cephalic vein after previous creation of a radio-cephalic AVF (RCAVF).

METHODS

A 79-years-old multimorbid male patient with end-stage kidney disease presented with an elsewhere placed left-sided RCAVF. With the start of cannulations, the patient suffered severe HAIDI. Due to the low/normal AVF-flow of 550 ml/min, a PAI procedure using the matured forearm cephalic and upper arm basilic veins in a form of native upper arm loop was performed.

RESULTS

Patient's symptoms resolved postoperatively with successful cannulations and tunneled dialysis catheter removal after 5 weeks. During a follow-up period of 64 months, several interventions were performed to maintain the patency, yet the AVF remained patent for >5 years.

CONCLUSIONS

This modified PAI technique using native vessels in form of upper arm loop graft is a feasible and durable option to maintain long-term cumulative patency and should be considered as a valid native treatment option for HAIDI.

Impact of Vascular Access Flow Suppression Surgery on Cervical Artery Circulation: A Retrospective Observational Study

Vascular access (VA) flow suppression surgery augments VA flow resistance and can increase other circulation flows hindered by high-flow VA. However, whether VA flow suppression surgery affects cervical circulation has rarely been reported. We aimed to determine the effect of VA flow suppression surgery on the cervical circulation in patients with high-flow VA. This single-center, retrospective, observational study included 85 hemodialysis patients who underwent VA flow suppression surgery at the Kanno Dialysis and Access Clinic between 2009 and 2018. Blood flow in the VA, bilateral vertebral arteries, and common carotid artery was measured before and after VA flow suppression surgery. The VA flow decreased from 1548 mL/min to 693 mL/min postoperatively. The flow of the vertebral artery on the VA side increased from 55 mL/min to 81 mL/min. The flow in the bilateral common carotid arteries also increased. Patients whose symptoms improved postoperatively showed better improvement in the vertebral artery on the VA side. VA flow suppression surgery in patients with high-flow VA increases the flow of the vertebral artery on the VA side and of the bilateral common carotid arteries. High-flow VA can hinder the vertebral and common carotid circulation.

Efficacy of Revision Using Distal Inflow in Patients with Symptomatic Dialysis Access-Associated Steal Syndrome

Objectives: In this study, we aim to assess the efficacy of revision using distal inflow (RUDI) in patients with symptomatic dialysis access-associated steal syndrome (DASS). Materials and Methods: All consecutive patients who were diagnosed with grade 3 or 4 DASS and have undergone RUDI in 4 years were included in this study. Results: In total, 35 patients were included in this study; participants had a mean age of 47.5±7.52 years and 54% (n=19) were males. As per our findings, significant improvement was noted in terms of paresthesia (81.2%, p-value: 0.012), coolness (79.4%, p-value: 0.006), pain (78.1%, p-value: 0.006), discoloration (76.4%, p-value: 0.044), paresis (71.4%, p-value: 0.016), and ulcer healing (50%, p-value: 0.044). Gangrene did not further progress in all patients (n=35). Reduction in fistula flow rate after RUDI was 57.5% (682±121 ml/min, p-value: 0.001). Digital systolic pressure was noted to improve by 71.4% (60±9.2 mmHg, p-value: 0.002) after RUDI. Peak systolic velocity increased in both ulnar (66.1±8.2 cm/s, p-value: 0.04) and radial (64.2±7.6 cm/s, p-value: 0.024) arteries of the wrist. Cumulative patency of RUDI graft was 100%, 91.4%, and 85.7% at 3, 6, and 12 months, respectively. Conclusion: RUDI has resulted in significant improvements in terms of DASS symptoms. Using a native vein as conduit, RUDI should be considered a procedure of choice for patients with high-flow DASS.

The Role of Ultrasound Examination in the Assessment of Suitability of Calcified Arteries for Vascular Access Creation-Mini Review

Arterial calcifications are present in 20-40% of patients with end-stage kidney disease and are more frequent among the elderly and diabetics. They reduce the possibility of arterio-venous fistula (AVF) formation and maturation and increase the likelihood of complications, especially distal ischemia. This review focuses on methods for detecting arterial calcifications and assessing the suitability of calcified arteries for providing inflow before the construction of an AVF. The importance of a clinical examination is stressed. A grading system is proposed for quantifying the severity of calcifications in the arteries of the arm with B-mode and Doppler ultrasound exams. Functional tests to assess the suitability of the artery to provide adequate inflow to the AVF are discussed, including Doppler indices (peak systolic velocity and resistive index during reactive hyperemia). Possible predictors of the development of distal ischemia are discussed (finger pressure, digital brachial index, acceleration and acceleration time), as well as the outcomes of AVFs placed on calcified arteries. It is concluded that a noninvasive ultrasound examination is probably the best tool for a morphologic and functional assessment of the arteries. An arterial assessment is of utmost importance if we are to create distal radiocephalic AVFs in our elderly patients whenever possible without burdening them with futile surgical attempts.

Coronary-subclavian steal syndrome causing myocardial infarction after arteriovenous fistula creation: a case report

Coronary subclavian steal syndrome (CSSS) caused by left subclavian artery (LSA) stenosis is a rare cause of myocardial infarction in patients having coronary artery bypass grafting (CABG), and it has also been observed after an arteriovenous fistula (AVF) was made. A 79-year-old woman who had undergone CABG years earlier and an AVF creation 1 month before experienced a non-ST-elevation myocardial infarction (NSTEMI). While selective catheterization of the left internal thoracic artery graft was impossible, a computed tomography scanner showed patency of all bypasses and proximal subocclusive LSA stenosis, and the digital blood pressure measurements objectified a haemodialysis-induced distal ischaemia. LSA's angioplasty and covered stent placement were successfully performed, resulting in symptom remission. A CSSS-induced NSTEMI due to a LSA stenosis aggravated by a homolateral AVF several years after CABG has been documented only infrequently. If vascular access is required in the presence of CSSS risk factors, the contralateral upper limb should be preferred.

Chinese Clinical Practice Guideline for the Management of "CKD-PeriDialysis"-the Periods Prior to and in the Early-Stage of Initial Dialysis

The National Experts Group on Nephrology have developed these guidelines to improve the management of pre-dialysis and initial dialysis patients with chronic kidney disease (CKD) (two periods contiguous with dialysis initiation termed here 'PeriDialysis CKD'). The pre-dialysis period is variable, whereas the initial dialysis period is more fixed at 3 months to 6 months after initiating dialysis. The new concept and characteristics of 'CKD-PeriDialysis' are proposed in the guideline. During the CKD-PeriDialysis period, the incidence rate of complications, mortality and treatment cost significantly increases and the glomerular filtration rate (GFR) rapidly decreases, which requires intensive management. The guideline systematically and comprehensively elaborates the recommendations for indicators to be used in for disease evaluation, timing and mode selection of renal replacement therapy, dialysis adequacy evaluation, and diagnosis and treatment of common PeriDialysis complications. Finally, future research directions of CKD-PeriDialysis are proposed. CKD-PeriDialysis management is a difficult clinical issue in kidney disease, and the development and implementation of these guidelines is important to improve the management of CKD-PeriDialysis patients in China, which could ultimately improve survival rates and quality of life, and reduce the medical burden.

The evolving panorama of vascular access in the 21st century

There are three major types of hemodialysis vascular access: hemodialysis catheters, arteriovenous grafts, and arteriovenous fistulas. Arteriovenous fistulas provide the best access due to their reliability and long-term patency. They are recommended by the current Kidney Disease Outcomes Quality Initiatives (K-DOQI) guidelines; however, not all patients benefit from arteriovenous fistulas due to poor maturation or a lack of adequate vasculature. Currently, hemodialysis is initiated via catheters in the majority of patients. Catheters are associated with high morbidity and mortality due to infection, lower quality of dialysis, and the development of central vein stenosis. The varied responses of patients to the different access types exemplify the need to choose the "right access for the right patient" based on scores that can predict death risk and progression of chronic kidney disease. Additionally, vascular access, often referred to as the "Achilles' heel" of hemodialysis patients, represents a significant percentage of the Medicare budget that continues to increase yearly. The purpose of this paper is to review the current literature on the management of vascular access complications and infection treatment and prevention. The paper also explores emerging research regarding the devices and methods to improve access outcomes such as early cannulation arteriovenous grafts, endovascular arteriovenous fistula creation, and regenerative grafts with resorbable scaffolds, among others. The data were collected through literature searches via PubMed, Athens and web search engines.

Digital pressure with laser Doppler flowmetry is better than photoplethysmography to characterize peripheral arterial disease of the upper limbs in end-stage renal disease patients

OBJECTIVE

There is no consensual definition of significant peripheral arterial disease of the upper limbs. Patients with end-stage renal disease are usually explored with Doppler ultrasound, which seems insufficient to characterize and quantify the arterial disease in this anatomic site. Candidates for haemodialysis access tend to be increasingly older and have polyvascular disease, and a better assessment of the vascular status of their upper limbs with finger systolic blood pressure is necessary. Photoplethysmography is simple and currently used in practice, but laser Doppler flowmetry may be more sensitive for low values. Our objective is to investigate additional information in the digit assessment over the ultrasound assessment of the upper limbs of patients awaiting haemodialysis and compare digital pressure values taken by photoplethysmography and laser Doppler.

METHODS

All included patients with end-stage renal disease scheduled for haemodialysis access received a prospective evaluation of their upper limbs with a clinical examination of the hands, an arterial upper limb Doppler ultrasound, and finger systolic blood pressure using photoplethysmography and laser Doppler flowmetry. Significant upper limb arterial disease was defined by a finger systolic blood pressure below 60 mm Hg or a finger brachial pressure index below 0.7.

RESULTS

Twenty-four patients were included in the study. In all, 41.7% of patients (n = 10) had parietal calcifications to the antebrachial arteries on Doppler ultrasound, 8.3% of patients (n = 2) had bilateral finger systolic blood pressure values below 60 mm Hg with laser Doppler flowmetry (but not confirmed with photoplethysmography), and 16.6% of patients (n = 4) had a finger brachial pressure index below 0.7 on both laser Doppler flowmetry and photoplethysmography. While there was an agreement between these two methods, higher values were recorded with photoplethysmography. The Pearson coefficient was 0.493 for the median of basal digital pressures in absolute values and 0.489 for finger brachial pressure index (p < 0.001).

CONCLUSION

Our study confirms the need to evaluate significant upper limb arterial disease in patients with end-stage renal disease not only with Doppler ultrasound but also with an evaluation of the finger systolic blood pressure. The correlation of the finger systolic blood pressure values using laser Doppler flowmetry and photoplethysmography was poor, which was probably due to an overestimation of the pressures with photoplethysmography. Despite the absence of a gold standard, we suggest that Laser Doppler flowmetry should be used rather than photoplethysmography to better characterize significant peripheral arterial disease of the upper limbs in patients with end-stage renal disease, particularly before creation of a new haemodialysis access. Protocol Record on clinical trial 38RC19.285.

Discovery of a large axillary artery vascular malformation during the evaluation of a patient with hemodialysis access-induced distal ischemia: Implications on pathophysiology and management

A patient with a 6-year-old left upper arm brachial cephalic AVF presented with symptoms of hemodialysis access-induced distal ischemia (HAIDI). Physical exam findings showed a well-developed AVF, but compression of the AVF aggravated arm pain and induced diffuse erythema of the left upper extremity. Angiographic evaluation disclosed the presence of a large axillary artery vascular malformation (AVM) as well as distal forearm hypo-perfusion. We elected to publish this case report to describe the interesting physical exam findings related to the AVM, and discuss HAIDI treatment options that are peculiar to this case. We also highlight the importance of thorough vascular evaluation prior to AV access creation as well as during the investigation of the cause of HAIDI.

Dialysis associated steal syndromes. A narrative review

BACKGROUND

To review contemporary concepts in the genesis of Dialysis Access Steal Syndrome (DASS) and its current management.

METHODS

An electronic search of literature from 1960 to 2020 in Pubmed and the Cochrane library was conducted and practice guidelines were examined. Search terms included dialysis, steal, ischemia, access and ESRD. Clinical presentation, pathophysiology, risk factors, diagnostic techniques and management outcomes of extremity ischemia following dialysis access creation were reviewed.

RESULTS

Symptomatic steal occurs in 4-10% of patietns after creation of hemodialysis access creation. Risk factos include brachial based fistula, diabetes, female sex, coronary heart disease, cerebrovascular disease, tobacco use, age more than 60 and hypertension. Diagnosis is mainly clinical and can be aided by non invasive testing. Correction o finflow stenosis, Distal revasulatisation with interval ligation, revision using distal inflow or other techniques are useful for fistula preservation.

CONCLUSIONS

Dialysis associated steal syndromes have a complex haemodynamic causation. Clinical presentation is diagnostic; however when the diagnosis is uncertain adjunctive noninvasive perfusion tests, duplex and other imaging amy be required. Management is guided by anatomic, patient and disease-related considerations.

Point-of-care Vascular Ultrasound: Of Fistulas and Flows

Point-of-care ultrasound (POCUS) is increasingly being used in nephrology as a diagnostic tool, and there is a growing interest among physicians and nursing staff to learn how to use POCUS for the evaluation of the dialysis vascular access (DVA). The goal of POCUS is to extend the physical examination and more closely evaluate the DVA at bedside. Typically, POCUS quickly answers yes-no questions (ie, Is the vein too deep? Y/N). It is not the goal of POCUS of the vascular access to extensively investigate the entire fistula or graft. In conjunction with a good physical examination, brightness-mode ultrasound alone can answer most questions regarding the DVA, such as depth and diameter of the vessel. With some additional training, a limited color Doppler can be added to the standard evaluation to check flow direction and pseudoaneurysms. With more extensive training and an understanding of Doppler physics, access flow volumes can also be determined using spectral Doppler-mode ultrasound.

Avoiding hemodialysis access-induced distal ischemia

Timely creation and maintenance of a safe and reliable vascular access is essential for hemodialysis patients with end-stage renal disease. Hemodialysis access-induced distal ischemia (HAIDI) is a recognized complication of arteriovenous fistulas and grafts that may result in serious or even devastating consequences. Avoiding such complications is clearly preferred over treatment of HAIDI once established. Proper recognition of patients at increased risk of HAIDI includes careful pre-operative evaluation of the patient's medical and surgical history along with physical examination and imaging to determine a plan for creating a functional permanent access while minimizing the risk of distal ischemia. Our aim is to review identifying characteristics of individuals at risk of HAIDI and provide recommendations regarding pre-operative assessment. Vascular access options and techniques are suggested for establishing a functional vascular access without distal ischemia for such patients.