WHAT IS ELECTROCARDIOGRAPHY (ECG, EKG) TEST?
Recording of the heart’s electrical current using electrodes from 12 different leads: bipolar limb leads I, II, III; augmented limb leads aVR, aVL, aVF; and precordial chest leads V1-V6. The heart’s electrical activity takes three forms on the ECG: the P wave, which signifies atrial depolarisation; the QRS complex, which signifies ventricular depolarisation; and the T wave, which signifies ventricular repolarisation. This test identifies conduction abnormalities and dysrhythmias, monitors recovery from MI, and helps evaluate the effectiveness of cardiac medications. Single-lead tracings monitor the presence and type of electrical conduction during cardiac emergencies and during insertion of a temporary transvenous pacemaker.