Abstract
Recent research findings have revealed a key role of oxidative DNA damage in the pathogenesis of atrial fibrillation (AF). Therefore, the circulating oxidative DNA damage marker 8-hydroxy-2'-deoxyguanosine (8-OHdG) may represent a biomarker for staging AF and identifying patients at risk for AF recurrence and postoperative atrial fibrillation (POAF) after treatment. The purpose of this study was to investigate whether serum levels of 8-OHdG correlate with the stage of AF, recurrence after AF treatment, and onset of POAF after cardiac surgery. In this prospective observational study, 8-OHdG levels were detected by enzyme-linked immunosorbent assay in human serum samples. Blood samples were collected from control patients without AF history; patients with paroxysmal AF and persistent AF undergoing electrical cardioversion or pulmonary vein isolation (PVI); and patients with sinus rhythm (SR) undergoing cardiac surgery. AF recurrence was determined during 12-month follow-up. Univariate and multivariate analyses were used to identify changes in 8-OHdG levels between the groups. Compared to the control group, 8-OHdG levels in the patient groups gradually and significantly increased during arrhythmia progression. 8-OHdG levels in AF patients showing AF recurrence after PVI treatment were significantly increased compared to patients without AF recurrence. Moreover, in SR patients undergoing cardiac surgery, 8-OHdG levels were significantly elevated in those showing POAF compared to patients without POAF. 8-OHdG level may represent a potential diagnostic biomarker for AF staging as well as for predicting AF recurrence and POAF after treatment.
Highlights
Atrial fibrillation (AF) is the most common progressive tachyarrhythmia and is associated with serious complications such as heart failure and stroke.[1]
Compared to the control group, 8-OHdG levels in the patient groups gradually and significantly increased during arrhythmia progression. 8-OHdG levels in AF patients showing AF recurrence after pulmonary vein isolation (PVI) treatment were significantly increased compared to patients without AF recurrence
In sinus rhythm (SR) patients undergoing cardiac surgery, 8-OHdG levels were significantly elevated in those showing postoperative atrial fibrillation (POAF) compared to patients without POAF
Summary
Atrial fibrillation (AF) is the most common progressive tachyarrhythmia and is associated with serious complications such as heart failure and stroke.[1] Due to the aging population, the prevalence of AF is steadily rising, especially in the population between 75 and 85 years of age.[2] AF increases morbidity and mortality rates, with a 5-fold increased risk. Recent research findings have revealed a key role of oxidative DNA damage in the pathogenesis of atrial fibrillation (AF). The circulating oxidative DNA damage marker 8-hydroxy20-deoxyguanosine (8-OHdG) may represent a biomarker for staging AF and identifying patients at risk for AF recurrence and postoperative atrial fibrillation (POAF) after treatment
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