 The D.C. roads and sidewalks closing for this week's NATO Summit. I'm Sandy Kozel. 726. Atrial fibrillation, or AFib, is the most common type of arrhythmia. And although the condition alone is not life-threatening, it can increase your risk of stroke and heart failure if not treated. Dr. Athanasios Tamiris, a cardiac electrophysiologist with MedStar Health, says pulsed field ablation is a new, safer treatment for atrial fibrillation.