Practical Step 4: How to Choose the Optimal "Lifeline"?
There is no perfect access, only the most suitable choice.
In the world of dialysis patients, “Unobstructed access ensures smooth dialysis” is not just a slogan, but a guarantee of life. A safe, unobstructed and durable vascular access is the “lifeline” for maintaining dialysis treatment.
Today, we are going to talk about the three main types of hemodialysis accesses:
Autologous Arteriovenous Fistula (AVF)
Arteriovenous Graft (AVG)
Central Venous Catheter (CVC)
What are their differences? How to choose the right one? This article will give you a clear understanding!
Autologous Arteriovenous Fistula (AVF) — The Gold Standard
1. Indications
-All hemodialysis patients with an expected lifespan > 1 year
– Newly admitted patients with good vascular conditions
– Diabetic patients (priority consideration)
– Young patients (18–60 years old)
2. Absolute Contraindications
– Arterial inner diameter < 1.5 mm in both upper extremities
– Severe stenosis or occlusion of the central vein
– Cardiac function class IV (EF < 30%)
3. Key Points of Ultrasound Assessment
– Artery: Inner diameter ≥ 2.0 mm, normal blood flow velocity, positive reactive hyperemia test
– Vein: Inner diameter ≥ 2.5 mm, good compressibility, no stenosis or thrombosis
– Optimal Location: Wrist (anatomical snuffbox area) → Forearm → Upper arm
Arteriovenous Graft (AVG) — A Reliable "Alternative Option"
1. Indications
– Poor autologous vascular conditions but adequate cardiac function
– Need for establishing a new access due to multiple failed fistulas
– Obese patients (subcutaneous tissue thickness > 1 cm)
2. Relative Contraindications
– Severe cardiac insufficiency
– Uncontrolled bleeding tendency
– Expected survival time < 3 months
3. Type Selection
– Forearm straight type: Patients undergoing first-time AVG
– Forearm loop type: Limited vascular conditions
– Upper arm loop type: Depleted forearm blood vessels
It serves as the optimal substitute when an AVF is not feasible.
Central Venous Catheter (CVC) — The "Emergency Access"
1. Indications
– Urgent need for dialysis
– During AVF maturation period (< 3 months)
– Terminally ill patients (expected survival < 3 months)
2. Type Selection
– Non-tunneled type: For emergency use, indwelling time < 1 week
– Tunneled type: Expected use > 1 week, with low infection risk
3. Placement Site Priority
1) Right internal jugular vein (first choice)
2) Left internal jugular vein
3) Femoral vein (for bedridden patients)
4) Subclavian vein (avoid as much as possible)
It is only for short-term use, and long-term dependence is not recommended.
A Comparative Overview of the Three Access Methods
Item | Autologous Arteriovenous Fistula (AVF) | Arteriovenous Graft (AVG) | Central Venous Catheter (CVC) |
Establishment Time | Matures in 4–8 weeks | Matures in 2–3 weeks | Immediate use |
Service Life | More than 5–10 years | 1–3 years | Several months |
Infection Risk | Low | Moderate | High |
Complications | Few | Frequent thrombosis | Infection + stenosis |
Dialysis Efficiency | High | Relatively high | Moderate |
Applicable Population | Patients with good vascular conditions | Patients with failed AVF or poor vascular conditions | Emergency / transitional period patients |
Access Selection: Individualization is King
Access selection is not a single-choice question, but a dynamic management process. In clinical practice, the following principle should be followed: “AVF first, AVG second, and CVC with caution”, which, however, needs to be flexibly adjusted according to the patient’s specific conditions. The following factors should be comprehensively considered during selection:
Vascular conditions (which can be pre-evaluated by ultrasound);
Age and comorbidities;
Urgency of initiating dialysis;
History of previous surgeries or catheter placements.
Importantly, each choice must be based on a comprehensive ultrasound assessment and supported by a long-term maintenance plan. The SonoMaxx handheld ultrasound enables on-the-go access evaluation and real-time visual scanning, efficiently and accurately safeguarding the dialysis lifeline. It greatly enhances the efficiency and accuracy of vascular access management and improves patients’ treatment experience.
☛ Next Episode Preview | Preoperative Ultrasound Assessment for Arteriovenous Fistula: A Critical Step in Building a “Perfect” Lifeline
After selecting the access type, how to perform a comprehensive preoperative assessment using ultrasound? The next episode will provide you with a detailed analysis.