Tissue plasminogen activator as a hemodialysis catheter locking solution

Area of Science:

• Nephrology
• Hematology
• Vascular Access

Background:

• Tunneled hemodialysis catheters require locking solutions to prevent thrombosis between treatments.
• Heparin locks pose a bleeding risk in patients with bleeding diathesis due to unintended anticoagulation.
• Tissue plasminogen activator (t-PA) is explored as a safer alternative locking solution.

Purpose of the Study:

• To evaluate the hematologic effects of using t-PA as a locking solution in heparin-free hemodialysis (HF-HD).
• To assess the safety and efficacy of t-PA locks in maintaining dialysis catheter performance.

Main Methods:

• Ten patients undergoing HF-HD received 2 mg of t-PA instilled into each lumen of their dialysis catheter.
• Hematologic parameters (ECLT, fibrinogen, D-dimer, FDPs) were measured pre- and post-locking.
• Catheter performance was evaluated at the subsequent dialysis session.

Main Results:

• Fibrinogen, D-dimer, and FDPs remained elevated but unchanged post-t-PA administration.
• Euglobulin clot lysis time (ECLT) significantly decreased at 15 minutes post-locking (p=0.016) but normalized by 30 minutes.
• No bleeding episodes or catheter thrombosis occurred; catheter performance was maintained.

Conclusions:

• A 2 mg t-PA locking solution effectively preserves hemodialysis catheter function.
• The observed transient increase in systemic fibrinolysis (decreased ECLT) is temporary and not associated with bleeding risk.
• t-PA represents a safe and effective alternative to heparin for dialysis catheter locking in select patients.