The purpose of this study is to study the effects of transthoracic electrical cardioversion for restoration of sinus rhythm in patients who present with recent onset atrial fibrillation, with regard to new silent cerebral thrombo-embolic lesions and cognitive function, as well as electrical and functional/structural reverse remodelling, and its effects on inflammatory changes / specific cardiac biomarkers, vasoactive peptides, coagulation activity, and active fibrinolysis.
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Percentage of patients with new cerebral ischemic events detected by nuclear Magnetic Resonance Imaging (MRI) of the brain after direct current electrical cardioversion (DCC), summing up those detected within 24 hours and those at 7 - 10 days after DCC.
Timeframe: Immediately after cardioversion of atrial fibrillation up to 10 days