Syncope is a sudden, brief loss of consciousness also known as “fainting.“ Learn about causes and treatment.
An occasional extra heartbeat that temporarily changes the heart's regular rhythm. The extra heartbeat originates in one of the heart's lower chambers.
A battery-operated device that is surgically implanted in the chest to detect and correct life-threatening heart arrhythmias.
Condition in which electrical signals in the heart are blocked, causing the heart to beat out of sync.
Tachycardia occurs when the heart beats faster than 100 beats per minute. It can occur as a normal response to exercise, fever, stress, or other stimuli. Tachycardia that occurs abruptly and without a clear cause, or when the heart rate increases out of proportion for a given activity is considered abnormal.
A type of abnormal heart rhythm in which the heart beats too quickly.
A malfunction in the heart's electrical system that causes the heart to beat slower than it should.
Hypertrophic cardiomyopathy is an inherited condition in which the heart muscle grows thicker than it should be.
Sudden cardiac arrest occurs when the heart stops pumping, and is a leading cause of death in the United States. Learn about symptoms and treatment.
When electrical abnormalities cause abnormal heart rhythms, this is called a heart arrhythmia. Learn more about the different types of arrhythmia and possible treatments.