title: Relation of Mitochondrial DNA Copy Number in Peripheral Blood to Postoperative Atrial Fibrillation After Isolated Off-Pump Coronary Artery Bypass Grafting.
abstract: Oxidative stress has been considered to be an important factor contributing to postoperative atrial fibrillation (PoAF). Mitochondrial DNA (mtDNA) copy number in peripheral blood has been found to be associated with a patient's oxidative stress. Therefore, we sought to determine whether there was association between mtDNA copy number and the onset of atrial fibrillation. mtDNA copy numbers were measured using the quantitative real-time polymerase chain reaction in peripheral blood from 485 consecutive patients with sinus rhythm undergoing coronary artery bypass grafting. The blood was collected before surgery. In the cohort, the incidence of PoAF was 20.8% (101/485). The mean mtDNA copy number was significantly higher in patents with PoAF than in those with sinus rhythm (36.43 vs 16.63, p <0.001). The receiver operating characteristic analysis proved that the mtDNA copy number could predict PoAF with good sensitivity and specificity (area under the curve = 0.814, cutoff = 20.91, sensitivity = 70.3%, specificity = 80.2%, p <0.001). On multivariate logistic and Cox regression analysis, mtDNA copy number was shown to be a significant independent risk factor for PoAF (odds ratio = 10.01, p <0.001 and hazard ratio = 7.011, p = 0.004). There was a strong positive correlation between mtDNA copy number and malondialdehyde in patients with PoAF (r = 0.449, p = 0.01). In conclusion, we showed that elevated mtDNA copy number in peripheral blood is associated with PoAF. Further investigation is needed to validate mtDNA copy number as a predictive biomarker for PoAF and to explore its potential role in arrhythmogenesis.
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China; Department of Cardiovascular Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shanxi, China.
authors.forename: Shu
authors.initials: S
authors.lastname: Xu
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China.
authors.forename: Yinli
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Jin
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China. Electronic address: xuexiaodong118@163.com.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Xue
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of Shenyang Military Area Command, Shenyang, Liaoning, China. Electronic address: huishanw@126.com.
authors.forename: Huishan
authors.initials: H
authors.lastname: Wang
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000097:blood / Q000453:epidemiology*; D047549:Coronary Artery Bypass, Off-Pump; D003324:Coronary Artery Disease / Q000601:surgery*; D004272:DNA, Mitochondrial / Q000097:blood*; D005260:Female; D006801:Humans; D015994:Incidence; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D018384:Oxidative Stress; D011183:Postoperative Complications / Q000097:blood / Q000453:epidemiology*; D016016:Proportional Hazards Models; D060888:Real-Time Polymerase Chain Reaction; D012189:Retrospective Studies; D012307:Risk Factors
chemical_list: D004272:DNA, Mitochondrial