Bleeding after intermittent or continuous r-hirudin during CVVH.

Area of Science:

• Cardiology
• Nephrology
• Pharmacology

Background:

• Heparin-induced thrombocytopenia (HIT) type II is a serious complication after cardiac surgery, necessitating anticoagulation alternatives.
• Continuous venovenous haemofiltration (CVVH) is often required for renal support in these critically ill patients.
• Recombinant hirudin (r-hirudin) is an alternative anticoagulant, but its safe administration requires careful monitoring.

Observation:

• This study describes bleeding complications in five cardiac surgery patients with HIT type II undergoing CVVH.
• Three patients received continuous r-hirudin, while two received intermittent boluses.
• Bleeding complications were observed in patients receiving continuous r-hirudin.

Findings:

• Continuous r-hirudin administration was associated with major bleeding complications.
• Switching to intermittent r-hirudin boluses reduced the incidence of bleeding.
• This may be attributed to a threefold lower cumulative daily dose of r-hirudin with intermittent administration.

Implications:

• Intermittent r-hirudin bolus administration may be a safer strategy for managing HIT type II in cardiac surgery patients on CVVH, especially when advanced monitoring is unavailable.
• Careful dose adjustment and monitoring are crucial for r-hirudin use in this patient population.
• Further research is warranted to optimize r-hirudin dosing and monitoring protocols in critically ill patients.