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This study aims to evaluate the effect of dexmedetomidine (DEX) sedation for relieving anxiety and the incidence of atrial fibrillation (AF) after off-pump coronary artery bypass graft (OPCABG).This randomized, double-blind, controlled trial was conducted on 196 patients who underwent OPCABG in Shandong Provincial Hospital from July 2017 to June 2018. The patients were randomly assigned to two groups, intervention of DEX group and Propofol (PROP) group. Episodes of postoperative AF (POAF) were identified within 5 days after OPCABG. Perioperative anxiety status was assessed using Zung's Self-Rating Anxiety Scale (SAS). The baseline demographic and surgical characteristics of the population and other outcome variables were evaluated.We analyzed 62 patients in the DEX group and 61 patients in the PROP group. There was no significant difference in SAS anxiety scores between two groups before surgery (P = 0.104), while SAS had significantly after surgery (P = 0.018). The incidence of POAF in the DEX group was lower than that of the PROP group (16.1% versus 32.8%, P = 0.037), and a total of 30 patients (30/123, 24.4%) manifested POAF after OPCABG. Some univariable predictors of POAF were detected. The conceptual model of mediator analyses showed DEX was not only directly related to POAF but was also indirectly related through the independent effect of anxiety level.The findings indicated that patients receiving DEX were more likely to have less incidence of POAF, also uniquely showed DEX administration and POAF processes as a function of anxiety status.

international heart journal

Anxiety Administrated by Dexmedetomidine to Prevent New-Onset of Postoperative Atrial Fibrillation in Patients Undergoing Off-Pump Coronary Artery Bypass Graft