An electrocardiogram (ECG, EKG) is a painless test that measures the electrical activity (rhythm) of the heart. For this test, which takes just a few minutes, one lies on a table with electrodes attached to the skin of the chest, arms, and legs. The ECG can reveal several different heart problems that can cause heart failure, including heart attacks, rhythm disorders, long-standing strain on the heart from high blood pressure, and certain valve problems.
However, the ECG result may be normal in heart failure