• David M Smadja, Sophie Susen, Antoine Rauch, Bernard Cholley, Christian Latrémouille, Daniel Duveau, Luca Zilberstein, Denis Méléard, and Marie-Fazia Boughenou.
• AP-HP, European Georges Pompidou Hospital, Hematology Department, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Paris, France; Inserm UMR-S1140, Paris, France. Electronic address: david.smadja@aphp.fr.
• J. Cardiothorac. Vasc. Anesth. 2017 Oct 1; 31 (5): 1595-1602.

ObjectivesTo determine hemostasis perturbations, including von Willebrand factor (VWF) multimers, after implantation of a new bioprosthetic and pulsatile total artificial heart (TAH).DesignPreclinical study SETTING: Single-center biosurgical research laboratory.ParticipantsFemale Charolais calves, 2-to-6 months old, weighing 102-to-122 kg.InterventionsSurgical implantation of TAH through a mid-sternotomy approach.Measurements And Main ResultsFour of 12 calves had a support duration of several days (4, 4, 8, and 10 days), allowing for the exploration of early steps of hemostasis parameters, including prothrombin time; coagulation factor levels (II, V, VII+X, and fibrinogen); and platelet count. Multimeric analysis of VWF was performed to detect a potential loss of high-molecular weight (HMW) multimers, as previously described for continuous flow rotary blood pumps. Despite the absence of anticoagulant treatment administered in the postoperative phase, no signs of coagulation activation were detected. Indeed, after an immediate postsurgery decrease of prothrombin time, platelet count, and coagulation factor levels, most parameters returned to baseline values. HMW multimers of VWF remained stable either after initiation or during days of support.ConclusionsCoagulation parameters and platelet count recovery in the postoperative phase of the Carmat TAH (Camat SA, Velizy Villacoublay Cedex, France) implantation in calves, in the absence of anticoagulant treatment and associated with the absence of decrease in HMW multimers of VWF, is in line with early hemocompatibility that is currently being validated in human clinical studies.Copyright © 2017 Elsevier Inc. All rights reserved.

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