Previously undiagnosed atrial fibrillation presents an absolute risk. Which statement describes this?

• A. New atrial fibrillation presents an unpredictable arrhythmia risk.
• B. Chronic AF with stable rate.
• C. AF with known duration but no symptoms.
• D. Atrial flutter with low risk.

Answer: (A)

When atrial fibrillation hasn’t been diagnosed yet, the risk it carries isn’t a fixed, predictable number because episodes can start and stop. The overall chance of complications like stroke depends on whether AF is active at any moment, and you can’t know in advance when it’s happening in someone who’s undiagnosed. That makes the risk truly unpredictable over time, which is why this description fits best.

In contrast, a continuous, chronic AF that’s always present suggests a more ongoing but still recognizable rhythm pattern, and AF that’s silent but with known duration has risk tied to a known time frame. Atrial flutter is a different rhythm with its own risk profile, not the same scenario as undiagnosed AF.