How to improve dialysis adequacy in patients with vascular access problems

Area of Science:

• Nephrology
• Vascular Access Management
• Dialysis Therapy

Background:

• Adequate dialysis dose (Kt/V) is crucial and often limited by reduced vascular access (VA) blood flow.
• Optimizing dialysis requires careful consideration of effective blood flow (Qb eff), recirculation, access flow, and hemodialyzer performance.

Purpose of the Study:

• To review strategies for optimizing dialysis dose (Kt/V) in patients with compromised VA flow rates.
• To explore methods to achieve adequate dialysis without surgical VA revision.

Main Methods:

• Evaluation of treatment time extension as a primary strategy.
• Assessment of controlled partial blood flow recirculation, particularly with central venous catheters (CVCs).
• Consideration of enhanced hemodialyzer clearance and monitoring of arterial pre-pump pressure (P asp) to optimize Qb eff.

Main Results:

• Increasing treatment time is the preferred method to avoid underdialysis when adequate blood flow is difficult.
• Prolonged sessions with partial recirculation (e.g., reversed CVC lines) can be effective.
• Advanced hemodialyzers show promise for improving dialysis adequacy in patients with low VA flow.

Conclusions:

• Strategies like extended treatment time, controlled recirculation, and utilizing high-efficiency hemodialyzers can optimize dialysis dose in patients with reduced VA flow.
• Staff education and involvement in monitoring parameters like P asp/Qb eff are important.
• Recent hemodialyzer advancements offer new avenues for achieving dialysis adequacy in challenging cases.