A calcium-containing electrolyte-balanced hydroxyethyl starch (HES) solution is associated with higher factor VIII activity than is a non-balanced HES solution,but does not affect von Willebrand factor function or thromboelastometric measurements - results of a model of in vitro haemodilution |
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Authors: | Juliane Rau Christoph Rosenthal Elisabeth Langer Michael Sander Erika Schulte Michael Schuster Christian von Heymann |
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Affiliation: | 1.Department of Anaesthesiology and Intensive Care Medicine, Clinical Chemistry and Pathobiochemistry, Campus Virchow-Klinikum and Campus Charité Mitte, Charité-University Medicine Berlin, Berlin, Germany;2.Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Campus Virchow-Klinikum and Campus Charité Mitte, Charité-University Medicine Berlin, Berlin, Germany;3.Institute for Medical Diagnostics Oderland, Frankfurt, Germany |
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Abstract: | BackgroundHydroxyethyl starch (HES) is known to impair blood coagulation. The impact of calcium-containing, balanced carrier solutions of HES on coagulation is controversial. We investigated the effects of increasing degrees of haemodilution with modern 6%, electrolyte-balanced HES vs non-balanced HES on coagulation in vitro, and compared the balanced HES to a balanced crystalloid solution for an internal control.Materials and methodsBlood samples from ten healthy volunteers were diluted in vitro by 20%, 40% and 60% with either calcium-containing balanced 130/0.42 HES, non-balanced 130/0.4 HES or balanced crystalloid. In all samples, blood counts, prothrombin time ratio, activated partial thromboplastin time, ionized calcium, factor VIII activity, von Willebrand factor antigen, von Willebrand factor collagen binding activity, and von Willebrand factor activity were determined, and activated rotational thromboelastometry (EXTEM and FIBTEM assays) was performed.ResultsHaemodilution impaired coagulation in a dilution-dependent manner as determined by both conventional laboratory assays and thromboelastometry. Ionized calcium increased with balanced HES (p≤0.004), but decreased with non-balanced HES (p≤0.004). Prothrombin time ratio (p≤0.002) and factor VIII levels (p=0.001) were better preserved with balanced HES than with non-balanced HES in dilutions ≥40%. Thromboelastometry showed no differences between values in blood diluted with the balanced or non-balanced HES.DiscussionIn vitro, a balanced calcium-containing carrier solution of 6% HES 130/0.42 preserved coagulation better than did non-balanced HES 130/0.4 as quantified by conventional coagulation assays, but not in activated thromboelastometry. One explanation could be the increased ionized calcium levels after dilution with calcium-containing carrier solutions. |
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Keywords: | blood coagulation disorder balanced solutions hydroxyethyl starch von Willebrand factor thromboelastometry |
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