Your heart may be racing or slowing
Aside from ventricular fibrillation, other abnormal rhythms that can cause the heart to stop pumping blood include ventricular tachycardia, which is marked by a quickened heartbeat (above 100 beats per minute) that is out of sync with the heart’s upper chambers.
Brachycardia is a heart rate that has slowed below 60 beats per minute.
