A type of abnormal heart rhythm in which the heart beats too quickly.
When electrical abnormalities cause abnormal heart rhythms, this is called a heart arrhythmia. Learn more about the different types of arrhythmia and possible treatments.
Atrial fibrillation is a heart rhythm problem that causes irregular heartbeat (arrhythmia) and abnormal blood flow.
Adult congenital heart disease is a type of defect in one or more structures of the heart that occurs before birth. Learn about symptoms and treatment.
A malfunction in the heart's electrical system that causes the heart to beat slower than it should.