European Concerted Action on Anticoagulation (ECAA): Clinical and Laboratory Studies

Area of Science:

• Clinical Medicine
• Laboratory Medicine
• Pharmacology

Background:

• The European Concerted Action on Anticoagulation (ECAA) has focused on clinical and laboratory aspects of oral anticoagulation across 16 European states.
• Previous research highlighted the need for standardized and efficient anticoagulation management.

Purpose of the Study:

• To evaluate the efficacy of a computer-assisted dosage program versus traditional manual methods for oral anticoagulation.
• To assess the utility of lyophilized plasmas for International Sensitivity Index (ISI) calibration in laboratory settings.

Main Methods:

• A randomized multicenter clinical trial compared computer-assisted and manual anticoagulation dosage programs.
• Laboratory studies investigated the use of lyophilized plasmas (artificially depleted and coumarin) for local ISI calibration, comparing results with fresh plasma calibrations.

Main Results:

• The computer dosage program significantly improved achievement of target International Normalized Ratio (INR) intervals and reduced dose adjustments compared to manual methods.
• Lyophilized plasmas provided acceptable ISI values in multicenter studies, with measurable but clinically acceptable differences from fresh plasma ISI.
• Specific calibration requirements were identified for different plasma types and reagents, and linear regression was deemed unsuitable for local coagulometer ISI calibration.

Conclusions:

• Computer-assisted dosage programs offer significant benefits for oral anticoagulation management, particularly in less specialized centers.
• Lyophilized plasmas can be effectively used for ISI calibration, but "like-to-like" calibrations are essential, and lyophilized normal plasmas cannot replace fresh plasma MNPT.
• Local INR correction with certified artificially depleted plasmas enhances inter-laboratory precision when coagulometers affect ISI.