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Adverse events (AEs) experienced by children and adults with congenital heart disease (CHD) on ventricular assist devices (VADs) are sometimes unique to these populations. The Advanced Cardiac Therapies Improving Outcomes Network (ACTION) and the Academic Research Consortium (ARC) aimed to harmonize definitions of pediatric and CHD AEs for use in clinical trials, registries, and regulatory evaluation. Data from the ACTION registry and adjudication committee were used to adapt general mechanical circulatory support ARC definitions. This ACTION-ARC international expert panel of trialists, clinicians, patients, families, statisticians, biomedical engineers, device developers, and regulatory agencies drafted and iterated definitions harmonized to ACTION data and existing literature during sessions conducted between December 2022 and May 2023, followed by dissemination across clinical/research audiences and professional organizations and further revision. Both email-linked, internet-based surveys and in-person discussions were used as a modified Delphi process. Nineteen AE types were identified and defined, including seven new event types and six event types that were deleted and will no longer be collected, achieving consensus. ACTION-ARC paired rigorous development with methodical stakeholder involvement and dissemination to define pediatric VAD AEs to facilitate assimilation of data across future clinical trials and evaluation of devices for VAD-supported children and adults with CHD., Competing Interests: Disclosure: A.L. is a consultant for Bayer, Abbott, Abiomed, Berlin Heart, and Syncardia and is the primary investigator for the Berlin ACTIVE driver trial. I.A. is a consultant for Abbott, Abiomed, Bivacor, and Berlin Heart. P.M.A.A. is Treasurer of the Board of Directors of the Extracorporeal Life Support Organization (ELSO) and immediate past-chair of PediECMO, a research collaborative between ELSO and the Pediatric Acute Lung Injury and Sepsis Investigators. P. Alexander’s institution received funding from the National Institutes of Health (NICHD R13HD104432) and the U.S. Department of Defense (U.S. DoD PRMRP Clinical Trial Award #W81XWH2210301). R.P.B. reports grants from the National Institutes of Health (NIH) R01 HL153519 and is a member of the Extracorporeal Life Support Organization (ELSO) Board of Directors. S.B. is a full-time employee of Abiomed, Inc. a part of Johnson and Johnson. K.B. is an Abbott employee. J.C. receives an unrestricted education grant—from Abbott and is a medical monitor for Pumpkin Trial. R.R.D. is a paid consultant for Abbott, Inc. and Abiomed, Inc. R.L.K. is an employee at Abbott, Inc. R.K. is an employee at Berlin Heart Inc. M.K. is involved in Grants & Consulting for Medtronic, Abbott Vascular, Johnson & Johnson, Boston Scientific, and Getinge. J.L. is a consultant for Abbott. D.L.S.M. is a consultant for Abbott Inc., Syncardia Inc., and Berlin Heart Inc. R.A.N. uses Berlin Heart of North America travel funds to attend the annual user’s group meeting. F.D.P. is a non-compensated ad-hoc scientific advisor for Abbott, BrioHealth Solutions, FineHeart, and Medtronic, a non-compensated medical monitor for Abiomed, a member—Data Safety Monitoring Board for Carmat, receives grant funding from the National Heart, Lung, and Blood Institute and the Agency for Healthcare Research and Quality, and receives partial salary support from Blue Cross/Blue Shield of Michigan as Associate Director of the Michigan Society of Thoracic and Cardiovascular Surgeons Quality Collaborative. D.M.P. is on the Data Safety Monitoring Board for the Berlin Active Driver Trial. D.R. is associated with ACTION, DSMB for Parexel (unrelated to topic of AE manuscript), and Medicolegal consultation (unrelated to topic of AE manuscript). J.W.R. is a consultant for American Regent, AskBio, BioMarin, Bayer, Merck, Bristol Myers Squibb, and Enzyvant. E.S. reports institutional contracts for which he receives no direct compensation with Boston Scientific, Cardiawave, Edwards Lifesciences, Medtronic, Shanghai Microport Medical Co. Ltd., NVT GmBH, Pie Medical Imaging, Siemens Healthcare GmBH. M.E.S. is involved in a Medtronic educational contract, Octapharma advisory panel, and NIH DSMB for PumpKIN trial (completed). J.M.T. is a Berlin Heart CEC member. C.V. is on the Merck scientific advisory committee and a consultant for Abiomed. C.R.V. is a consultant for PTC therapeutics (previous), Antisense (current), and Capricor (current). The other authors have no conflicts of interest to report., (Copyright © ASAIO 2024.)