Comprehensive Vascular Access Management

NEPHROHUB • ADVANCED INTERACTIVE CASE

Educational disclaimer: This postgraduate case is for education and does not replace bedside assessment, local vascular-access protocols, multidisciplinary judgment, current prescribing information, or patient-specific evaluation.

Difficulty and format

Difficulty: Advanced. Format: Four-stage branching hemodialysis access case focused on clinically significant AV fistula dysfunction, endovascular treatment, recurrence, and access succession planning.

Learning objectives

By the end of this case, learners should be able to recognize clinical indicators of AV fistula dysfunction, integrate physical examination with dialysis-treatment trends, distinguish clinical monitoring from device-based surveillance, select evidence-aligned intervention for clinically significant stenosis, monitor after angioplasty, and plan recurrent stenosis management within the patient’s individualized ESKD Life-Plan.

Stage 1 — Bedside assessment of a failing access

Presentation

Mrs. Maria Gonzalez is a 58-year-old woman with kidney failure requiring hemodialysis because of diabetic nephropathy. She has used a left radiocephalic AV fistula for 18 months; it was created two years ago. During the last three treatments, the dialysis technician has reported difficult cannulation and lower achievable blood-flow rates. Her history includes diabetes, hypertension, peripheral vascular disease, and a right-arm AV graft that thrombosed after eight months.

For two weeks, she has noticed that the fistula feels different, with a weaker thrill and a change in the bruit. She has no pain, swelling, fever, erythema, drainage, or hand ischemic symptoms. The radial pulse and capillary refill are preserved. The fistula has a diminished thrill, and the bruit is high-pitched and localized rather than the expected continuous machinery murmur.

Decision point 1 — Is this clinically significant access dysfunction?

Preferred decision: Treat the findings as suspected AV fistula dysfunction and arrange prompt access evaluation. Examine the entire access circuit, including inspection for aneurysm, skin change, edema, collateral veins, and infection; palpation of the thrill and pulse augmentation; auscultation of the bruit; assessment of inflow and outflow; distal perfusion; and review of recent cannulation, pressures, blood-flow rates, recirculation, bleeding time, and delivered dialysis dose.

The change in thrill and bruit plus difficult cannulation and reduced blood flow are clinical indicators. A high-pitched, localized bruit suggests a hemodynamically important stenosis, but physical findings do not determine its exact location. Do not intervene based only on an isolated surveillance measurement in an asymptomatic access.

Stage 2 — Integrate dialysis trends and targeted imaging

Treatment records

Blood-flow rates have fallen from her usual 350–400 mL/min to 250–280 mL/min. Venous pressures have risen from 120–140 mmHg to 180–200 mmHg. Arterial pressures are more negative, and the dialysis team needs higher pump speeds to approach the prescribed blood flow. Kt/V has fallen from 1.4–1.5 to 1.2–1.3. These trends should prompt evaluation of delivered dialysis, treatment time, sampling, recirculation, cannulation, and access function rather than being interpreted in isolation.

Imaging

Targeted duplex ultrasound demonstrates a significant venous-outflow lesion with approximately 70% narrowing and a velocity ratio of 3.5 across the segment. Arterial inflow appears satisfactory, and there is no evidence of central venous obstruction on the available study. The access-flow measurement is 800 mL/min, but this value should be interpreted in context; no single flow threshold replaces clinical assessment and the overall dialysis picture.

Decision point 2 — Is intervention indicated?

Preferred decision: Because the patient has multiple clinical indicators plus a significant lesion, arrange timely fistulography and endovascular treatment planning. KDOQI implementation guidance supports intervention when a clinically significant indication is present together with a significant stenosis, generally at least 50%. The indication is not the Doppler percentage alone.

Before the procedure, review the ESKD Life-Plan, prior access procedures and imaging, cannulation zones, contrast and allergy history, bleeding and anticoagulation issues, cardiopulmonary risk, and the contingency plan if the access thromboses or cannot be salvaged.

Stage 3 — Treat and monitor the clinically significant lesion

Decision point 3 — Initial treatment

Preferred decision: Use percutaneous transluminal angioplasty as first-line endovascular therapy in most situations, performed by the appropriate interventional team under local protocol. Procedural access route, sedation, balloon type, inflation pressure, and duration should be individualized to anatomy and patient risk. Assess technical result by residual stenosis, restoration of access function, and resolution of clinical indicators; do not rely on a single post-procedure flow value.

If the lesion responds inadequately, the team may consider prolonged inflation or an ultrahigh-pressure balloon according to local expertise. Selective stent-graft use requires attention to lesion location, future cannulation zones, the ESKD Life-Plan, and whether the device would compromise future access. Stent grafts are not a universal default.

Post-intervention monitoring

After angioplasty, document the access examination, blood pressure, puncture-site status, bleeding, distal perfusion, and any signs of rupture, dissection, thrombosis, embolization, or infection. On the next dialysis treatment, review cannulation, achievable blood flow, venous and arterial pressures, recirculation, treatment completion, and delivered adequacy. Report loss of thrill, prolonged bleeding, new swelling, hand pain or coldness, fever, or sudden access failure urgently.

Stage 4 — Recurrence, revision, and access succession

Clinical response

The patient returns to dialysis the next day with an improved thrill. Blood flow reaches 380 mL/min, venous pressure returns to 135 mmHg, and Kt/V improves to 1.45. These changes support restoration of access function, but they do not guarantee durable patency.

Clinical monitoring remains primary. The dialysis team continues routine examination and tracks access-related indicators at each treatment. Targeted duplex or fistulography is obtained when new clinical changes arise; a fixed monthly duplex schedule is not mandatory for every patient and asymptomatic preemptive angioplasty is not recommended solely to improve patency.

Recurrence at six months

At six months, difficult cannulation, a weaker thrill, rising venous pressures, and a similar duplex lesion recur. Repeat angioplasty restores function, but the recurrence prompts a multidisciplinary review.

Decision point 4 — What is the next best strategy?

Preferred decision: Do not assume that one recurrence automatically requires surgery. Review lesion location, cannulation-zone involvement, prior angioplasty results, residual stenosis, access anatomy, patient preferences, and the ESKD Life-Plan. Options may include another PTA, selected stent graft when the lesion and future access plan permit, surgical revision, or planned creation of the next access. Surgical consultation is particularly important when endovascular treatment repeatedly fails, anatomy is unfavorable, or revision can preserve useful access while protecting future sites.

In this patient, recurrent venous-anastomotic disease outside the intended cannulation zone leads the access team to discuss surgical revision with creation of a new proximal venous anastomosis, while documenting a contingency and succession plan if the revised fistula later fails. The choice is individualized and should be made by the patient and multidisciplinary access team.

Expert synthesis

This case illustrates that AV access management is a clinical-monitoring and Life-Plan process rather than a sequence of isolated Doppler measurements. A changed thrill or bruit, difficult cannulation, pressure changes, falling achievable blood flow, recirculation, prolonged bleeding, or declining delivered dialysis should trigger structured assessment. When clinical indicators coexist with significant stenosis, PTA is usually the initial endovascular treatment. Recurrent disease requires review of anatomy, prior interventions, cannulation zones, future access options, and the patient’s ESKD Life-Plan. Selective stent grafting, surgical revision, repeat PTA, or access succession may each be appropriate in different circumstances.

Advanced Self-Assessment

Complete the 10-question Advanced assessment below. Detailed explanations are provided after submission.

NephroHub assessment: Advanced level • 10 questions • vascular-access clinical reasoning

Advanced Self-Assessment: Comprehensive Vascular Access Management

1 / 10

What is the most appropriate long-term planning principle for this patient with recurrent access disease?

Preserve the current fistula at all costs, regardless of future access consequences.

Focus only on today’s dialysis blood-flow rate.

Integrate the patient’s preferences, modality plan, vascular anatomy, contingency options, vessel preservation, and access succession into an individualized ESKD Life-Plan.

Avoid discussing future access until the current fistula thromboses.

2 / 10

After technically successful PTA, the same clinically significant stenosis recurs at six months. What is the best next approach?

Declare the fistula unusable and place a catheter without multidisciplinary review

Review anatomy, prior interventions, cannulation-zone involvement, patient goals, and future access options; then consider repeat PTA, selective stent graft, surgical revision, or access succession

Continue monthly duplex alone because the access is still patent

Perform surgical revision automatically after the first recurrence

3 / 10

When might a stent graft be considered for recurrent AV fistula stenosis?

As the default first treatment for every new stenosis

Whenever the patient has a high D-dimer

When the lesion lies within a planned cannulation zone that would be covered by the device

For selected recurrent clinically significant disease when anatomy and the ESKD Life-Plan permit it without compromising cannulation or future access

4 / 10

Which statement best reflects the surveillance principle after successful angioplasty?

Clinical monitoring is primary; targeted imaging is obtained when new clinical indicators arise, and asymptomatic preemptive angioplasty is not routine.

Monthly duplex ultrasound is mandatory for every functioning AV fistula.

A normal access-flow value excludes clinically important stenosis.

Any duplex stenosis should be treated immediately even without clinical dysfunction.

5 / 10

Which post-angioplasty plan is most appropriate?

Discharge without access examination because the angiogram looked successful

Schedule automatic angioplasty every six months to prevent recurrence

Document access and distal examination, monitor puncture-site bleeding and complications, and review dialysis performance at the next treatment

Avoid using the fistula for several weeks in all patients

6 / 10

What is the most appropriate initial treatment for this patient’s clinically significant venous-outflow stenosis?

Immediate surgical ligation and creation of a new fistula without endovascular assessment

Percutaneous transluminal angioplasty performed according to local interventional protocol

Routine anticoagulation as definitive treatment for the stenosis

Observation with a fixed monthly duplex schedule because flow remains 800 mL/min

7 / 10

Which finding combination best meets the principle for intervention on an AV fistula lesion?

An asymptomatic 30% lesion found on a screening scan

An isolated access-flow result below a locally used threshold without clinical change

A Doppler abnormality without a dialysis or examination abnormality

Multiple clinical indicators plus a significant stenosis, generally at least 50%, on confirmatory imaging

8 / 10

How should the fall in Kt/V from 1.4–1.5 to 1.2–1.3 be used in this case?

As a concerning trend that prompts review of delivered dialysis, recirculation, treatment time, cannulation, and access function

As definitive proof that the access has a 70% stenosis

As evidence that the patient should be switched immediately to peritoneal dialysis

As an indication for routine monthly angioplasty regardless of symptoms

9 / 10

What is the best interpretation of the high-pitched, localized bruit and diminished thrill?

They establish access infection and require immediate antibiotics.

They prove distal steal syndrome despite preserved hand perfusion.

They suggest a hemodynamically important stenosis, but imaging is needed to localize and characterize the lesion.

They are expected findings in a mature radiocephalic fistula.

10 / 10

Which combination most strongly indicates clinically significant AV fistula dysfunction in this patient?

A single access-flow measurement of 800 mL/min in an asymptomatic patient

Difficult cannulation, a changed thrill or bruit, reduced achievable blood flow, and rising venous pressures

A stable thrill with one isolated Kt/V value of 1.2

A normal radial pulse and normal capillary refill

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References

NKF KDOQI. 2019 Vascular Access Guideline and implementation tools.
NKF KDOQI. [inline_viewer url="https://www.kidney.org/sites/default/files/vait-15a_management_clinically_significant_av_fistula_lesions.pdf"].
Lok CE, Yuo T, Lee T. Hemodialysis Vascular Access: Core Curriculum 2025.

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