Which classification of atrial fibrillation indicates persistent episodes that last longer than 7 days but less than 3 months?

The classification of atrial fibrillation that refers to episodes lasting longer than 7 days but less than 3 months is Persistent AF: Early. This term describes a specific state of atrial fibrillation where the episodes do not resolve spontaneously and require medical intervention but have not exceeded the time frame that would classify them as long-standing persistent atrial fibrillation.

Understanding the definitions of the other classifications helps contextualize why this answer is accurate. Permanent AF refers to a situation where the atrial fibrillation persists indefinitely and is accepted by both the patient and the physician, usually beyond the 3-month mark. Paroxysmal AF involves episodes that terminate spontaneously or with intervention, typically lasting less than 7 days. First Diagnosed AF simply refers to the initial identification of atrial fibrillation without indicating the duration.

Thus, Persistent AF: Early specifically captures the essence of episodes that persist beyond 7 days but are still within a limited timeframe, distinguishing it from the other classifications based on duration and management approach.