An abnormal heart rhythm, called arrhythmia, is a change in either the speed or pattern of the heartbeat.
During an arrhythmia episode, the heart may beat too rapidly, slowly or irregularly. If an arrhythmia is suspected, an electrocardiogram (EKG) will be ordered to record your heart’s electrical activity. During the test, the heart’s electrical impulses are recorded in a graph-like formation on a strip of moving paper. However, very often an arrhythmia will not occur during the brief period (less than a minute) of actual recording, and other types of testing may be required that will monitor the heart over longer periods of time.