An Introduction to ECG Interpretation
Electrocardiography is a method that registers electrical activity against time. The changes in electrical potential difference (voltage) during depolarization and repolarisation of the myocardial fibers are recorded by electrodes positioned on the surface of the chest and on the limb (limb leads). The sources of the electrical potentials are contractile cardiac muscle cells (cardiomyocytes). The ECG waveform is either printed onto graph paper that runs at a constant speed or shown on a computer screen. The advantages of electrocardiography come with its low cost, immediate availability and easy implementation. The procedure itself is also non-invasive.
KeywordsLeft Ventricular Lead Ventricular Lead Ventricular Depolarization Electrical Axis Accessory Conduction Pathway
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