In patients with atrial fibrillation, which of the following is a significant risk factor for stroke?

In patients with atrial fibrillation, hypertension is a significant risk factor for stroke because it can lead to increased pressure in the blood vessels, which may weaken them over time. High blood pressure can contribute to the development of other cardiovascular conditions and is directly linked to an elevated risk of thromboembolic events, including stroke.

In the context of atrial fibrillation, where the irregular heartbeat can cause blood to pool in the atria and increase the risk of clot formation, the presence of hypertension exacerbates this risk. Therefore, managing blood pressure is crucial to reduce stroke risk in patients with this condition.

Other factors, such as regular exercise, a low-fat diet, and youth, do not constitute significant stroke risk factors in the context of atrial fibrillation. In fact, regular exercise and a healthy diet can actually support cardiovascular health and potentially reduce the risk of stroke. Youth is generally associated with lower risks for many health conditions, including cardiovascular issues.