NCLEX Review Guide: Hemodialysis Access

Arteriovenous Fistula (AVF)

• Gold standard for permanent dialysis access created by surgically connecting an artery directly to a vein, typically in the forearm.
• Requires maturation time of 6-12 weeks before use to allow vessel walls to thicken and accommodate large-bore needles.
• Provides highest blood flow rates (300-400 mL/min) and has lowest infection risk compared to other access types.

Arteriovenous Graft (AVG)

• Synthetic tube connecting artery to vein when patient's vessels are inadequate for fistula creation.
• Can be used 2-3 weeks after placement but has higher infection and clotting risk than fistulas.
• Typically placed in upper arm when forearm vessels are unsuitable for fistula.

Central Venous Catheter

• Temporary access inserted into large central vein (internal jugular, subclavian, or femoral).
• Can be used immediately but carries highest risk for infection and central line-associated bloodstream infections (CLABSI).
• Tunneled catheters (Permcath) can be used for weeks to months while permanent access matures.

Assessment Techniques

1. Palpation: Feel for thrill - continuous vibration indicating blood flow through access
2. Auscultation: Listen for bruit - whooshing sound heard with stethoscope over access site
3. Visual inspection: Check for signs of infection, bleeding, or skin changes around access site
4. Circulation check: Assess distal pulses and capillary refill in access extremity

Protective Measures

• No blood pressure measurements on access arm to prevent compression and potential damage to vessels.
• Avoid venipuncture, IV insertion, or tight clothing on access extremity to preserve vessel integrity.
• Educate patient to sleep with access arm free and avoid carrying heavy objects with access arm.

Self-Care Instructions

• Perform daily thrill checks by placing fingertips over access site to feel for vibration.
• Keep access site clean and dry, inspect daily for signs of infection or changes in appearance.
• Report immediately: loss of thrill, excessive bleeding, signs of infection, or severe pain in access arm.
• Avoid tight clothing, jewelry, or sleeping on access arm to prevent compression.

Frequently Missed Concepts

• Mistake: Using immature fistula too early - remember 6-12 weeks maturation required.
• Mistake: Taking blood pressure on access arm during routine care - always use opposite arm.
• Mistake: Ignoring absent thrill/bruit - this indicates access failure requiring immediate intervention.
• Mistake: Confusing arterial steal syndrome with normal post-dialysis fatigue - assess circulation carefully.