Vascular access in dialysis and it complications

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hemodialysis vascular access arteriovenous fistula graft types diagram

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Vascular Access in Dialysis and Its Complications

Overview

Reliable vascular access is the lifeline of hemodialysis (HD). No single type of access fulfills all desired requirements, so the access strategy must be individualized based on patient anatomy, comorbidities, life expectancy, and the ESKD "Life Plan" concept introduced by the 2019 KDOQI guidelines.

The three major types of HD vascular access are:

Arteriovenous fistula (AVF)
Arteriovenous graft (AVG)
Tunneled central venous catheter (TDC)

1. Types of Vascular Access

1.1 Arteriovenous Fistula (AVF)

The AVF — introduced by Brescia and colleagues in 1966 — remains the preferred access. It is entirely subcutaneous, preserves arterial flow to the hand, and has the best long-term patency with fewest complications.

Preferred hierarchy (distal-to-proximal, following KDOQI):

Priority	Type	Details
1st	Radiocephalic (Brescia-Cimino)	Radial artery → cephalic vein at wrist
2nd	Forearm basilic AVF	Radial or ulnar artery → basilic vein
3rd	Brachiocephalic (upper arm)	Brachial artery → cephalic vein
4th	Brachiobasilic (requires transposition)	Brachial artery → transposed basilic vein

Pre-operative assessment:

Arterial: triphasic waveform, equal bilateral BPs; brachial artery ≥3 mm, radial/ulnar ≥2 mm
Venous: cephalic or basilic vein ≥2 mm diameter, depth ≤6 mm
Allen test to confirm intact palmar arch before using radial artery inflow
Central venous evaluation if history of central lines or arm swelling

Maturation: AVF requires 4–6 weeks minimum for maturation. A mature AVF shows a continuous thrill, low-pitch bruit, and adequate flow on duplex ultrasound. The "rule of 6s": flow ≥600 mL/min, diameter ≥6 mm, depth ≤6 mm.

Sabiston Textbook of Surgery, p. 2391

1.2 Arteriovenous Graft (AVG)

Used when native vessels are inadequate for AVF creation. Made from expanded polytetrafluoroethylene (ePTFE), polyurethane, or biologically processed bovine carotid artery.

Can be used within 24–72 hours (early cannulation grafts) or 2–4 weeks after placement
Lower long-term patency than AVF; most common failure is venous anastomotic stenosis from neointimal hyperplasia
12-month primary patency: 43–64%; secondary patency: 71–86%

Configurations when upper extremity vessels are exhausted:

Cervical AVG (brachial artery → subclavian or jugular vein)
Chest wall loop AVG (axillary artery → axillary vein)
Axillofemoral AVG

Cervical and chest-wall AVG configurations showing brachial/axillary artery to subclavian/jugular vein bypass routes

1.3 Tunneled Dialysis Catheter (TDC)

Inserted through a subcutaneous tunnel, typically in the internal jugular or femoral vein; the cuff anchors the catheter and reduces infection. TDCs are used:

As a bridge to permanent access maturation
When permanent access is not feasible
As long-term access in limited-life patients

The problem: ~80% of patients in the United States start HD with a catheter. Catheter use is associated with higher mortality, more hospitalizations, and greater cost than AVF. KDOQI advocates a "catheter-last" approach rather than the older "fistula-first" paradigm.

2. "Vein Preservation" Strategy

Patients with CKD who may need future HD should avoid:

PICC lines (cause venous stenosis in cephalic/basilic veins)
Repeated venipuncture in the forearm cephalic vein
Blood pressure measurement in the planned access arm

Brenner and Rector's The Kidney, p. 2703

3. Access Monitoring & Surveillance

Physical examination remains the most important monitoring technique:

Normal AVF: soft, compressible, continuous thrill; low-pitch bruit
Venous outflow stenosis: bounding, pulsatile fistula that does not flatten when the arm is raised
Inflow/anastomotic stenosis: diminished thrill

Objective tools include:

Static/dynamic venous pressure monitoring (serial measurements more valuable than single threshold)
Ultrasound dilution method (Transonic device) — measures access blood flow; decline predicts impending failure
Declining Kt/V or prolonged hemostasis time should prompt access evaluation

Primary patency = function without any intervention since creation. After any intervention, secondary patency applies.

Brenner and Rector's The Kidney, p. 2154

4. Complications of Vascular Access

4.1 Stenosis and Thrombosis

The most common cause of access failure.

AVF: usually juxta-anastomotic stenosis or venous outflow stenosis
AVG: neointimal hyperplasia at the venous anastomosis is the dominant mechanism
Presentation: declining flow, difficulty cannulating, prolonged bleeding time, reduced Kt/V

Ultrasound findings:

B-mode ultrasound of juxta-anastomotic intimal hyperplasia causing stenosis at AVF

Color Doppler showing complete thrombosis of hemodialysis graft with absent intraluminal flow

Management:

Percutaneous transluminal angioplasty (PTA/venoplasty) — first-line for most stenoses
Stent placement: evidence supports stent superiority over balloon alone for venous anastomotic stenosis of AVG (RCT, n=190)
Thrombectomy (pharmacomechanical or surgical) for acute thrombosis
Central venous stenosis: balloon venoplasty ± stent; surgical bypass (jugular turndown) as last resort

4.2 Infection

AVF infections are uncommon due to autologous tissue. AVG infections are more frequent (ePTFE is susceptible to biofilm formation). Catheter infections are the most serious.

Access Type	Infection Rate	Common Organisms
AVF	Lowest	S. aureus, gram-negatives
AVG	Intermediate	S. aureus, Pseudomonas
TDC	Highest	S. aureus (MRSA common), CoNS

TDC infections:

Exit-site infection: erythema/exudate at skin entry — treat topically ± systemic antibiotics
Tunnel infection: cellulitis along tunnel track — requires catheter removal
Catheter-related bloodstream infection (CRBSI): bacteremia from catheter — requires antibiotics ± catheter removal; S. aureus and Candida generally mandate removal; other organisms may be "salvaged" with antibiotic lock therapy

Early identification of local catheter infections is key to preventing systemic sepsis. A 2023 systematic review (PMID 37178476) specifically addressed systematic surveillance of local TDC infections.

4.3 Venous Hypertension (Central Venous Stenosis/Occlusion)

Results from prior central venous catheters (subclavian > internal jugular) causing fibrotic stenosis
Presentation: ipsilateral arm edema, dilated chest wall veins, facial/neck swelling, difficulty achieving adequate dialysis
Investigation: CT venogram or catheter-based venogram
Treatment: balloon venoplasty; stent if significant recoil; surgical bypass if endovascular fails

4.4 Aneurysms and Pseudoaneurysms

True aneurysms (AVF): degeneration of venous wall from repeated cannulation; progressive dilation
Pseudoaneurysms (AVG): failure of ePTFE graft wall integrity at cannulation sites; risk of rupture
Indications for intervention: rapid expansion, skin breakdown/ulceration, infection, pain, cosmetic concern, inability to cannulate
Management: surgical resection/interposition graft, endovascular covered stent

4.5 Hemodialysis Access-Induced Distal Ischemia (HAIDI) / "Steal Syndrome"

Access creation diverts blood from the distal limb through a low-resistance circuit.

Incidence:

Forearm fistulas: <1%
Antecubital-based fistulas: up to 8%
AVG: often early onset (within 30 days)

Risk factors: Advanced age, female sex, diabetes, peripheral arterial disease, brachial artery inflow, large-diameter outflow conduit, prior steal

HAIDI grading (SVS):

Grade	Features
0	No symptoms
1	Coldness/pallor; no pain
2	Ischemic pain on exercise or during dialysis
3	Ischemic rest pain, tissue necrosis, gangrene

Workup: Photoplethysmography with/without fistula compression; duplex ultrasound assessing flow volume and direction

Management (depends on access flow volume):

High-flow (>1 L/min): Banding (least invasive; 33% failure, 11% thrombosis) or Revision Using Distal Inflow (RUDI)
Low/normal flow: DRIL (Distal Revascularization–Interval Ligation) — most effective; restores antegrade flow but sacrifices normal arterial continuity — or PAI (Proximal Arterial Inflow) — increases forearm pressure without sacrificing arterial continuity
Radiocephalic fistulas: radial artery ligation distal to anastomosis (if palmar arch intact)
Grade 3 ischemia / digital gangrene: access ligation

Sabiston Textbook of Surgery, p. 2393

4.6 Ischemic Monomelic Neuropathy (IMN)

Acute, devastating complication occurring immediately after access creation (usually brachial artery-based access in diabetics)
Caused by acute ischemia of peripheral nerves despite apparently intact macrovascular flow
Presentation: severe burning pain, weakness, sensory loss in multiple nerve distributions of the hand immediately post-op
No vascular insufficiency may be apparent clinically
Management: immediate access ligation — delay leads to permanent neurological deficit
Distinguished from steal syndrome by the absence of major ischemic skin changes

4.7 High-Output Heart Failure

Access blood flow >1–2 L/min diverts cardiac output
Particularly problematic in patients with pre-existing cardiomyopathy
Presents with progressive dyspnea, increased cardiac output, and cardiomegaly
Nicoladoni-Branham sign: compression of the access causes reflex bradycardia
Management: access banding, conversion to a lower-flow configuration, or access ligation

4.8 Access Non-Maturation (AVF-Specific)

Up to 30–40% of AVFs fail to mature sufficiently for use
Causes: small vessel diameter, venous outflow stenosis, accessory veins stealing flow
Maturation interventions: angioplasty of stenotic segments, accessory vein ligation, superficialization (surgical transposition of deep veins)
The 2023 systematic review on non-conventional techniques for radiocephalic AVF (PMID 39096957) describes strategies to improve maturation rates

5. Peritoneal Dialysis Catheter Complications (Brief)

Complication	Notes
Malfunction/poor drainage	Omental wrap, catheter displacement, constipation
Exit-site infection	Treated with local antibiotics
Tunnel infection	May need catheter removal
Peritonitis	Most serious — Staphylococcus and Streptococcus most common; gram-negative peritonitis carries worse prognosis

Percutaneous placement is associated with fewer exit-site infections and peritonitis at 30 days compared to open surgical placement (meta-analysis data).

Summary Table

Complication	AVF	AVG	TDC
Stenosis/thrombosis	++	+++	+
Infection	+	++	+++
Aneurysm	++	+ (pseudo)	—
Steal/HAIDI	+/++	++	—
IMN	+	+	—
High-output failure	+	+	—
Non-maturation	+++	—	—
Central vein stenosis	+	+	+++

Key References:

Sabiston Textbook of Surgery, 21st ed., Chapter 107 (Dialysis Access) — p. 2385–2397
Brenner and Rector's The Kidney, 10th ed., Chapter 63 — p. 2703–2715
KDOQI Clinical Practice Guideline for Vascular Access: 2019 Update (Lok CE et al., Am J Kidney Dis 2020;75:S1–S164)
PMID 37178476 — Systematic review: early identification of local infections in HD catheters (2023)
PMID 39096957 — Systematic review: non-conventional techniques for radiocephalic AVF (2025)
PMID 40123557 — Review: Alpha to Omega of Dialysis Access (AVF and AVG), Part 1 (2025)

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