Electrocardiogram (ECG) Test
An electrocardiogram (ECG) is a non-invasive test that measures the electrical activity of different parts of the heart muscle using superficial electrodes placed at twelve specific points (leads) on the chest and limbs (see figure 1). The electrodes detect very small electrical signals from the heart during each heart beat (as the heart contracts and relaxes). The heart’s electrical activities are recorded and displayed as line tracings seen as waves with spikes and dips on a moving strip of graph paper. There are normal and abnormal patterns generated from each electrode that will help indicate the health of your heart.
This gives very important and useful information about the heart. The ECG :
Interpretation of your ECG tracing require a very specialised skill.
Schematic representation of normal ECG
Figure 1: Placement of the precordial electrodes