Definition: An arrhythmia is an abnormal heart rhythm. The heart rhythm can be abnormal either because it is too fast (tachycardia) or too slow (bradycardia), or because it is no longer controlled by the sinus node.
Arrhythmia
By Richard N. Fogoros, M.D., About.com Guide
Updated July 25, 2011
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
See More About:
Explore Heart Health Center
Must Reads
- Assess Your Risk of Heart Disease
- Keep Your Heart Healthy
- Symptoms of Heart Disease
- How To Survive a Heart Attack
- The Basics On Coronary Artery Disease
Most Popular
See More About:
By Category
- Atrial Fibrillation
- Cholesterol, triglycerides
- Coronary Artery Disease
- Drugs for Heart Disease
- Exercise and Heart Disease
- Heart Healthy Diet
- Heart Valve Disease
- High Blood Pressure
- Living With Heart Failure
- Pacemakers & Defibrillators
- Palpitations & Arrhythmias
- Reducing Cardiac Risk
- Surgery, congenital, & more
- Women & Heart Disease
- Syncope (fainting)
