Abnormal Heartbeat (Arrhythmia)
An abnormal heartbeat (arrhythmia) is any variation in the normal heartbeat. Abnormal heartbeats occur when the heart has an irregular heart rhythm, beats too fast (tachycardia), or beats too slow (bradycardia).
The electrical system of the heart creates signals that trigger the heart to pump. These electrical signals control the heart rate and rhythm. Normally, the heart beats in a regular rhythm and at a rate that is appropriate for the work the body is doing. An arrhythmia results from a problem in the electrical system of the heart. Things that can cause the heart to beat abnormally include heavy smoking, alcohol use, excess caffeine or other stimulants, stress, thyroid disease, and fever.
Many arrhythmias are minor, causing only occasional abnormal heartbeats and requiring no treatment. Others, such as atrial fibrillation, can be life-threatening because they increase the risk of blood clots and strokes. Arrhythmias are of special concern in people who also have heart disease or heart failure. Some arrhythmias can be treated with medicine. Others may require an electrical shock (cardioversion), surgery, or a pacemaker.
eMedicineHealth Medical Reference from Healthwise
To learn more visit Healthwise.org
© 1995-2012 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Find out what women really need.
Pill Identifier on RxList
- quick, easy,
Find a Local Pharmacy
- including 24 hour, pharmacies