Atrial fibrillation with rapid ventricular response is a fancy name for an irregular heartbeat. When your heart's electrical signals aren't working right, it can lead to a heartbeat that's too fast.
Etripamil, an investigational drug, showed statistically significant reduction in ventricular rate by 30 beats per minute for episodes of atrial fibrillation with rapid ventricular rate (p 0.0001) ...