Atrial fibrillation carries a risk of embolic events such as stroke if not adequately managed. Which option reflects this risk?

• A. No risk of embolic events
• B. Embolic events such as stroke are possible
• C. Embolic events only occur with ventricular tachycardia
• D. There is a risk only during exertion

Answer: (C)

Atrial fibrillation causes thromboembolism because the irregular, often rapid atrial contractions lead to blood stasis in the left atrium, especially in the left atrial appendage. This stagnant blood can form clots that can travel to the brain and cause an ischemic stroke. The embolic risk is ongoing and can occur at any time, not just during exertion or only in the presence of other rhythm disturbances. Therefore, embolic events such as stroke are possible in atrial fibrillation, even if symptoms are mild or intermittent.