Which of the following is NOT a factor in the CHA2DS2-VASc score?

The CHA2DS2-VASc score is a clinical tool used to assess the risk of stroke in patients with atrial fibrillation. Each component of the score corresponds to various risk factors that increase the likelihood of thromboembolic events.

Vascular disease, which includes a history of myocardial infarction, peripheral artery disease, or aortic plaque, is a recognized risk factor and contributes to the overall score. Age is also crucial; individuals aged 65 to 74 receive points in the scoring system due to their higher risk of stroke. Additionally, being female is factored into the score as a risk enhancer, further escalating the risk for women compared to men.

In contrast, a history of arrhythmia is not a factor in the CHA2DS2-VASc score. While atrial fibrillation itself is a condition that necessitates the use of this scoring system, the score focuses specifically on certain demographic and medical factors rather than the existence of arrhythmias. Thus, the absence of arrhythmia history in the scoring criteria makes it clear why this is the correct choice for an answer regarding factors NOT included in the CHA2DS2-VASc score.