Abstract:Objective: To investigate the predictive value of serum microRNA-499 (miR-499) combined with phospholipid transfer protein (PLTP) levels on atrial fibrillation (AF) after off-pump isolated coronary artery bypass grafting (OPCABG). Methods: A total of 237 patients with coronary artery disease who underwent OPCABG admitted to our hospital from January 2018 to June 2022 were selected and divided into 69 cases in the AF group and 168 cases in the non-AF group according to whether AF occurred after OPCABG.Serum miR-499 and PLTP levels were measured by qPCR and ELISA.Spearman correlation was used to analyze the correlation between serum miR-499 and PLTP levels in patients with AF after OPCABG,multi-factor logistic regression was used to analyze the factors influencing AF after OPCABG,and ROC curve was used to analyze the predictive value of serum miR-499 and PLTP levels on AF after OPCABG. Results: Serum miR-499 levels were higher in the AF group (1.53±0.29) than in the non-AF group (1.22±0.33),and PLTP levels[1.36 (1.00,2.01)] were lower than in the non-AF group[2.33 (1.39,3.53)],with statistically significant differences (t/Z=6.731,5.879,all P<0.001).Spearman correlation analysis showed that serum miR-499 was negatively correlated with PLTP levels in AF patients after OPCABG (rs=-0.789,P<0.001).Multifactorial logistic regression analysis showed that age (OR=1.085,95% CI:1.036 to 1.136),diabetes (OR=3.399,95% CI:1.472 to 7.853),left atrial diameter (OR=1.194,95% CI:1.063 to 1.341) and miR-499 (OR=2.961,95% CI:1.944 to 4.508) were independent risk factors for AF after OPCABG and PLTP (OR=0.319,95% CI:0.195 to 0.522) was an independent protective factor (P<0.05).ROC curve analysis showed that serum miR-499 combined with PLTP levels (AUC=0.842,95% CI:0.789 to 0.886) predicted a greater AUC for AF after OPCABG than miR-499 (AUC=0.759,95% CI:0.699 to 0.812),PLTP (AUC=0.743,95% CI:0.683 to 0.798) predicted individually (Z=3.154,3.804,all P<0.05). Conclusion: Increased serum miR-499 levels and decreased PLTP levels were independently associated with post-OPCABG AF,and serum miR-499 combined with PLTP levels were of high value in predicting post-OPCABG AF.
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