Arrhythmia: An arrhythmia is any disorder of the heart rate or rhythm, where the heart beats too fast, too slow, or with an irregular pattern.
Electrocardiogram (ECG):An electrocardiogram is a medical test that records the electrical activity of the heart and is used to diagnose various cardiac conditions including fibrillation.
Cardiac Arrest: Cardiac arrest is a sudden loss of blood flow resulting from the failure of the heart to effectively pump; fibrillation can be a common cause