Electrocardiogram or ECG is a diagnostic test which measures electrical signals that travel through the heart, causing it to pump blood through its chambers. These impulses are recorded in form of a graph showing waves in a distinct pattern.Depending on shape of these waves, doctors can evaluate any abnormal condition of heart. So, ECG acts as an important and a relevant tool in determining several diseases such as coronary artery disease, arrhythmia or hypertrophic heart. The test’s results also can suggest other disorders that may affect heart’s function. It is a useful test that can detect problems with the frequency of heart beat, irregular heart rhythm and the strength and timing of electrical signals as they pass through each part of your heart.