Arrhythmias are caused by a change in the electrical signals of the heart. It may be an abnormal signal or a problem with how the signal moves through the heart. This may happen because of one or more of the following:
- The heart's pacemaker (sinoatrial [SA] node) is not working as it should. It will set a rate or rhythm that isn’t normal.
- Damage to the heart that makes it harder for these signals to move through the heart. May be caused by injury or illness such as:
- A signal to contract starts in areas of the heart other than the SA node.
- Problems with how your muscles and nerves work.
Factors outside the body that can affect the rhythm of the heart include:
- Reviewer: EBSCO Medical Review Board Michael J. Fucci, DO, FACC
- Review Date: 12/2018 -
- Update Date: 01/02/2019 -