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Inflammation has been recently implicated in the pathophysiology of atrial fibrillation (AF). The aim of this study was to examine the variation of inflammatory indexes during the first week after successful electrical cardioversion of persistent AF. Successive measurements of white blood cell (WBC) count, C-reactive protein (CRP) and fibrinogen levels were performed in 30 cardioverted patients. At the end of the 7-day follow-up period, AF had recurred in 30% of patients. A significant variance was found in serial measurements of fibrinogen levels in the two groups (non-relapse and relapse, p ¼ 0.005).Fibrinogen levels increased significantly in patients who relapsed into AF, but remained stable in patients who remained in sinus rhythm. In the latter patients, CRP values tended to decrease post-cardioversion, but WBC count was significantly lower (p < 0.001) on the 7th day (6083 AE 1335), compared with baseline values (6648 AE 1395). The variation of inflammatory indices post-cardioversion might have prognostic implications with regard to sinus rhythm maintenance.

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