Does the heparin lock concentration affect hemodialysis catheter patency?

Area of Science:

• Nephrology
• Vascular Access
• Pharmacology

Background:

• Heparin lock solutions prevent thrombosis in hemodialysis catheters.
• Recent practice changes involve decreasing heparin concentration to reduce bleeding risks and costs.
• The impact of lower heparin concentrations on catheter patency was previously unknown.

Purpose of the Study:

• To compare the efficacy of low-concentration (1000 units/ml) versus high-concentration (5000 units/ml) heparin lock solutions.
• To evaluate the effect of heparin concentration on dialysis catheter patency and thrombolytic use.
• To assess the cost-effectiveness of different heparin lock concentrations.

Main Methods:

• Retrospective analysis of 105 patients with new tunneled hemodialysis catheters.
• Patients were divided into two groups based on heparin lock concentration: 1000 units/ml (n=47) or 5000 units/ml (n=58).
• Primary endpoint: cumulative catheter patency; Secondary endpoint: frequency of thrombolytic instillation.

Main Results:

• Cumulative catheter survival was similar between the low- and high-concentration heparin groups at 120 days (71% vs. 73%).
• The low-concentration heparin group required significantly more tissue plasminogen activator (thrombolytic) instillation (hazard ratio, 2.18).
• No major bleeding complications were noted. Drug costs were 23% lower with the low-concentration heparin lock.

Conclusions:

• Low-concentration heparin lock solutions (1000 units/ml) are effective in maintaining hemodialysis catheter patency.
• A higher frequency of thrombolytic instillation is necessary to preserve patency with lower heparin concentrations.
• Reduced heparin concentration offers a cost-saving strategy without compromising catheter survival.