Butyrylcholinesterase activity in patients with postoperative delirium after cardiothoracic surgery or percutaneous valve replacement- an observational interdisciplinary cohort study.

"Declarations Ethics approval and consent to participateAll patients gave written informed consent. The study was approved by the local ethics committee on the 06.06.2018 (Ethics Committee of Hannover Medical School, Hannover, Germany, Approval No. 7876 BO S 2018 by Univ. Prof. Dr. med. Stefan Engeli) and conducted in accordance with their relevant guidelines and regulations. The study was conducted in accordance with the Declaration of Helsinki. Consent for publicationPatients signed informed consent regarding publishing their data. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding Open Access funding enabled and organized by Projekt DEAL. This project was financially supported by the Else-Kröner-Fresenius-Foundation within a structured doctoral program (KlinStrucMed) of the Hannover Medical School. We acknowledge support by the German Research Foundation (DFG). LISA-CHE®-testkits were provided by the Dr. Franz Köhler Chemie GmbH, Bensheim, Germany."