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Atrial fibrillation is a condition in which the heart beats in an irregular pattern. It is caused by a problem in the heart's electrical pathways. It can be a sign of heart disease or other health problems that affect the heart.
Heart disease is the leading cause of death in the United States. It is an umbrella term, made up of a variety of different diseases affecting the...
Ventricular fibrillation (V-fib) is a dangerous type of arrhythmia, or irregular heartbeat. It affects your heart’s ventricles. Because sustained V-fib can lead to cardiac arrest and death, it requires immediate medical attention.