Do we need to anticoagulate all patients with non-valvular or non-rheumatic AF?Not so, according to the CHADS2 score (furthermore, the use of warfarin is not without risk. It can complicate an intracranial bleeding).CHADS2 score is a scoring system to identify risk factors for developing stroke in patients with nonrheumatic atrial fibrillation.CHADS2 score is a combination of two previous scoring