As no studies before now have thoroughly investigated the risk associated with the exposure to low-dose ionizing radiations in patients undergoing catheter ablation (CA), we aimed to evaluate the oxidative and DNA damage in 59 CA patients (10 of whom received N-acetylcysteine (NAC) before the procedure). A burst of oxidized/reduced glutathione ratio was observed 3 hours after procedure that was diminished by NAC administration. 8-Hydroxy-2'-deoxyguanosine (8-OHdG) concentrations, index of oxidative DNA damage, showed a peak 24 hours after CA. A positive correlation between 8-OHdG peak and fluoroscopy time and a negative correlation among 8-OHdG decrease (from the peak to 48 hours after CA) and all procedure parameters were found. Furthermore, DNA tail percentages (which reflect the extent and the number of DNA strand breaks) positively correlated with 8-OHdG concentrations. This study evaluates for the first time the kinetic of oxidative damage in patients undergoing CA procedure. Our findings raise the question of whether 8-OHdG can be used as a circulating biomarker of DNA oxidative damage induced by low-dose ionizing radiations in different clinical settings. Antioxid. Redox Signal. 28, 1137-1143.
Keywords: 8-hydroxy-2′-deoxyguanosine; DNA damage; catheter ablation; fluoroscopy; glutathione; oxidative stress; radiological risk.