Argatroban is a parenteral direct Thrombininhibitor used for anticoagulation in patients suffering from heparin induced thrombocytopenia (HIT). There is increasing evidence suggesting that the activated partial thromboplastine time (aPTT), which is recommended for dosage monitoring, correlates poorly with serum argatroban concentration in critically ill patients. Therefore it may be badly suited to determine the correct dosing. Ecarin based tests have been proven to be effective in determining effects of direct thrombin inhibitors. The investigators now plan to evaluate a novel, rotational thrombelastometric, ecarin based bedside test for its ability to measure the effect of argatroban in critically ill patients. So far an excellent correlation of a similar test could be shown in spiked plasma of healthy adults. According to the manufacturer the ECA-Test is able to detect direct thrombininhibitors. However to our knowledge neither the ECA-Test nor other ecarin-based thrombelastometric tests have been studied in critically ill patients treated with argatroban. The investigators therefore seek to investigate the correlation of the ECA-Test (ClotPro®) with the serum argatroban concentration.
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Correlation of ECA-Test CT with Argatroban Plasma Concentration
Timeframe: ECA-Test CT and Argatroban Plasma Concentration will be measured on five consecutive days starting with inclusion in the study on day 0.