• Stephan Schueler, Christopher T Bowles, Rabea Hinkel, Robert Wohlfarth, Michael R Schmid, Stephen Wildhirt, Ulrich Stock, Biventricular Epicardial Assist Technology Working Group, Johannes Fischer, Judith Reiser, Christine Kamla, Konstantin Tzekos, Hassiba Smail, and M Hamman de Vaal.
• Department of Cardiothoracic Surgery, Newcastle upon Tyne Freeman Hospital, Newcastle upon Tyne, United Kingdom. Electronic address: stephan.schueler@nhs.net.
• J. Thorac. Cardiovasc. Surg. 2023 Oct 1; 166 (4): 11191129.e11119-1129.e1.

ObjectiveDue to severely limited donor heart availability, durable mechanical circulatory support remains the only treatment option for many patients with end-stage heart failure. However, treatment complexity persists due to its univentricular support modality and continuous contact with blood. We investigated the function and safety of reBEAT (AdjuCor GmbH), a novel, minimal invasive mechanical circulatory support device that completely avoids blood contact and provides pulsatile, biventricular support.MethodsFor each animal tested, an accurately sized cardiac implant was manufactured from computed tomography scan analyses. The implant consists of a cardiac sleeve with three inflatable cushions, 6 epicardial electrodes and driveline connecting to an electro-pneumatic, extracorporeal portable driver. Continuous epicardial electrocardiogram signal analysis allows for systolic and diastolic synchronization of biventricular mechanical support. In 7 pigs (weight, 50-80 kg), data were analyzed acutely (under beta-blockade, n = 5) and in a 30-day long-term survival model (n = 2). Acquisition of intracardiac pressures and aortic and pulmonary flow data were used to determine left ventricle and right ventricle stroke work and stroke volume, respectively.ResultsEach implant was successfully positioned around the ventricles. Automatic algorithm electrocardiogram signal annotations resulted in precise, real-time mechanical support synchronization with each cardiac cycle. Consequently, progressive improvements in cardiac hemodynamic parameters in acute animals were achieved. Long-term survival demonstrated safe device integration, and clear and stable electrocardiogram signal detection over time.ConclusionsThe present study demonstrates biventricular cardiac support with reBEAT. Various demonstrated features are essential for realistic translation into the clinical setting, including safe implantation, anatomical fit, safe device-tissue integration, and real-time electrocardiogram synchronized mechanical support, result in effective device function and long-term safety.Copyright © 2022 The American Association for Thoracic Surgery. All rights reserved.

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