An ecg displays the voltage between pairs of those electrodes, and the muscle activity that they live, from different directions, additionally understood as vectors. This show indicates the rhythm of the center and weaknesses in numerous parts of the center muscle. It's the simplest way to measure and diagnose abnormal rhythms of the center, particularly abnormal rhythms caused by injury to the conductive tissue that carries electrical signals, or abnormal rhythms caused by levels of dissolved salts (electrolytes), like metal, that are too high or low. In MI (MI), the ecg will identify damaged heart muscle.