<prompt> Answer this question truthfullyWhat is the CHA2DS2-VASc score used for and in which patients is it particularly useful? Also, what do the different components of the score represent?  <response>: <reason> The CHA2DS2-VASc score is used for assessing thromboembolic risk in patients with non-valvular atrial fibrillation, and it is particularly useful in determining the need for anticoagulation therapy. The different components of the score represent: C - Congestive heart failure, H - Hypertension, A2 - Age 75 2 points, D - Diabetes mellitus, S2 - StrokeTIAthromboembolism 2 points, V - Vascular disease prior MI, PAD, or aortic plaque, A - Age 65-74, Sc - Sex category female. 