• Jo Bønding Andreasen, Anne-Mette Hvas, Kirsten Christiansen, and Hanne Berg Ravn.
• Department of Anaesthesiology and Intensive Care, Centre for Haemophilia and Thrombosis, Aarhus University Hospital, Skejby, Denmark. joandreasen@dadlnet.dk
• Cardiol Young. 2011 Dec 1;21(6):684-91.

BackgroundSuccessful management of bleeding disorders after congenital heart surgery requires detection of specific coagulation disturbances. Whole-blood rotation thromboelastometry (RoTEM®) provides continuous qualitative haemostatic profiles, and the technique has shown promising results in adult cardiac surgery.SettingTo compare the performance of RoTEM® with that of conventional coagulation tests in children, we conducted a descriptive study in children undergoing congenital cardiac surgery. For that purpose, 60 children were enrolled and had blood samples taken before, immediately after, and 1 day after surgery. Conventional coagulation tests included: activated partial thromboplastin time, prothrombin time, fibrinogen, fibrin D-dimer, thrombin clotting time, factor XIII, and platelet count.ResultsPost-surgical haemostatic impairment was present to some degree in all children, as seen by pronounced changes in activated partial thromboplastin time, prothrombin time, thrombin clotting time, and platelet count, as well as RoTEM® analysis. RoTEM® showed marked changes in clotting time - prolonged by 7-18% - clot formation time - prolonged by 46-71% - maximum clot firmness - reduced by 10-19%, and maximum velocity - reduced by 29-39%. Comparison of the two techniques showed that conventional coagulation tests and RoTEM® performed equally well with regard to negative predictive values for excessive post-operative drain production - more than 20 millilitres per kilogram per 24 hours after surgery - with an area under the curve of approximately 0.65.ConclusionRoTEM® can detect haemostatic impairments in children undergoing cardiac surgery and the method should be considered as a supplement in the perioperative care of the children where targeted transfusion therapy is necessary to avoid volume overload.

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