An electrocardiogram (ECG or EKG) is one of the simplest and fastest
procedures used to evaluate the heart. Electrodes (small, plastic
patches) are placed at certain locations on the chest, arms, and legs.
When the electrodes are connected to an ECG machine by lead wires,
the electrical activity of the heart is measured, interpreted, and
printed out for the physician's information and further interpretation.
A signal-averaged electrocardiogram is a more detailed type of ECG.
During this procedure, multiple ECG tracings are obtained over a
period of approximately 20 minutes in order to capture abnormal
heartbeats which may occur only intermittently.
A computer captures all the electrical signals from the heart and
averages them to provide the physician more detail regarding how the
heart's electrical conduction system is working.
Signal-averaged ECG is one of several procedures used to assess the
potential for dysrhythmias/arrhythmias
(irregular heart rhythms) in certain medical situations.
Other related procedures that may be used to assess the heart include:
Related (non-echocardiographic) procedures that may be used to
assess the heart include: