Final answer:
Atrial Fibrillation is an atrial arrhythmia that is unresponsive to cardioversion. Alternative management strategies include medication therapy, catheter ablation, and surgical procedures.
Step-by-step explanation:
The atrial arrhythmia that is unresponsive to cardioversion is Atrial Fibrillation. Alternative management strategies that may be considered include medication therapy, catheter ablation, and surgical procedures like the Maze procedure and atrial appendage closure.