The term arrhythmia refers to any change from the normal sequence of electrical impulses, causing abnormal heart rhythms. This can cause the heart to pump less effectively.
The heart is a muscle that works like a pump. The heart beats (contracts) when an electrtical impulse from the heart's "natural pacemaker" moves through it. A standard sequence must be followed for the heart to pump properly at a regular pace. A normal heart beats 60 to 100 times a minute.
