Influence of a chronic beta-blocker therapy on perioperative opioid consumption - a post hoc secondary analysis.

"Declarations Ethics approval and consent to participateThe study was approved by the local ethics committee at Charité - Universitätsmedizin Berlin (EA 2/092/14) on the 31.07.2014. Informed written consent was obtained from all patients before study inclusion. Consent for publicationNot applicable. Competing interestsLMR, MN, LD, KS, DH, GW, FB, JK declare no competing interests. RFT, CS and ST disclosed all their financial and non-financial relationships and activities within 36 months of manuscript submission in the ICMJE disclosure forms submitted with the manuscript. Competing interests LMR, MN, LD, KS, DH, GW, FB, JK declare no competing interests. RFT, CS and ST disclosed all their financial and non-financial relationships and activities within 36 months of manuscript submission in the ICMJE disclosure forms submitted with the manuscript."

"Funding Open Access funding enabled and organized by Projekt DEAL. The research leading to these results has reveived the funding from the European Community’ s FP7 under grant agreement n. 602461."

"Trial registration This study was registered at ClinicalTrials.gov (NCT02265263) on the 15.10.2014 with the principal investigator being Univ.-Prof. Dr. med. Claudia Spies."