Electrocardiograms

• ECG

  • The electrical activity of the heart generates tiny currents that can be picked up by electrodes on the skin surface.

  • Once amplified they can produce a pattern on a machine called an ELECTROCARDIOGRAM (ECG).
• • P wave

  • Electrical excitation from SA node spreading across atria

  • QRS wave

  • Wave of excitation passing over the ventricles

  • T wave

  • Electrical recovery of the ventricles