What is one potential consequence of untreated atrial fibrillation?

Atrial fibrillation is a condition characterized by an irregular and often rapid heart rhythm, which can lead to various complications if left untreated. One of the most significant risks associated with untreated atrial fibrillation is the increased likelihood of stroke. This occurs because the irregular heartbeats can lead to blood pooling in the atria of the heart, which can form clots. If a clot travels to the brain, it can block a blood vessel and cause a stroke.

The link between atrial fibrillation and stroke risk is well established. Patients with atrial fibrillation can be five times more likely to experience a stroke compared to those without the condition. The management of atrial fibrillation often includes anticoagulant medications to decrease the risk of blood clot formation, thus helping to prevent stroke.

In contrast, the other options — increased stamina, heart attack, and improved exercise performance — do not accurately reflect the primary risks associated with untreated atrial fibrillation. While heart attack can also be a concern in patients with heart rhythm disorders, stroke remains a specific and serious consequence uniquely associated with atrial fibrillation.