AFIB becomes AFIB with RVR when?

• A. Over 60 bpm
• B. Over 100 bpm
• C. Over 140 bpm
• D. Over 200 bpm

Answer: (B)

In atrial fibrillation, the atria are firing very rapidly, but how fast the ventricles beat depends on conduction through the AV node. When the ventricular rate climbs above 100 beats per minute, we call that atrial fibrillation with rapid ventricular response. The 100 bpm threshold is used because it marks the point where the heart rate becomes tachycardic and more likely to cause symptoms or hemodynamic issues, distinguishing a controlled AF from a rapid one.

The other numbers—60, 140, or 200 bpm—don’t define AF with rapid ventricular response. A resting heart rate of 60 is normal, and rates like 140 or 200 are higher extremes that may be seen in other tachyarrhythmias or specific clinical scenarios, but the standard definition of AF with RVR is a ventricular rate over 100 bpm.