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Anticoagulation in combined membrane/adsorption systems.

Jens Hartmann¹, K Strobl, D Falkenhagen

¹Center for Biomedical Technology, Danube University Krems, Krems, Austria. Jens.hartmann@donau-uni.ac.at

|March 5, 2009

Summary

This summary is machine-generated.

Effective anticoagulation in blood purification requires careful management of heparin and citrate. Pre-coating adsorbents reduces heparin removal, while unfractionated heparin is preferred. Citrate anticoagulation with high flux filters prevents accumulation and suppresses complement activation.

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Area of Science:

Nephrology
Hematology
Biomedical Engineering

Background:

Effective anticoagulation is crucial for extracorporeal blood purification to prevent blood clotting.
Heparin, the standard anticoagulant, has limitations in membrane/adsorption systems.
Citrate offers an alternative by reducing ionized calcium but requires careful monitoring to prevent patient accumulation.

Purpose of the Study:

To evaluate heparin removal in membrane/adsorption blood purification systems.
To optimize adsorbent pre-coating to minimize heparin adsorption.
To determine appropriate heparin dosage and ionized calcium levels for patient safety and complement suppression.
To compare citrate clearance across different dialysis filters for optimal anticoagulation strategy.

Main Methods:

Investigated heparin removal characteristics in membrane/adsorption systems.
Assessed the impact of adsorbent pre-coating on heparin and bilirubin adsorption.
Evaluated unfractionated versus fractionated heparin efficacy and removal.
Measured ionized calcium concentrations and complement activation markers.
Compared citrate clearance using various dialysis filters.

Main Results:

Pre-coating adsorbents with heparin significantly reduced heparin adsorption without affecting bilirubin removal.
Unfractionated heparin demonstrated lower removal rates compared to fractionated heparins due to a lower sieving coefficient.
An extracorporeal Ca(2+) concentration of 0.2 mmol/L effectively suppressed complement activation.
High flux filters were recommended for citrate anticoagulation to prevent citrate accumulation.

Conclusions:

Adsorbent pre-coating with heparin is an effective strategy to manage heparin anticoagulation in blood purification.
Unfractionated heparin is a safer choice for these systems.
Citrate anticoagulation, when managed with appropriate filters, provides effective anticoagulation and minimizes patient risk.
Optimized anticoagulation strategies are essential for patient safety in extracorporeal blood purification.