ECG Simplified - Part 5: Intro

- Useful for early career medicos and paramedics
Now we will see how the cardiac chamber enlargements are inferred from the ECG. Enlargement of the atria are reflected in the P wave which represents the atrial electrical activity. Normal P wave has a maximum amplitude of 2.5 mm and width of 2.5 mm on the ECG.
An increase in the amplitude of P wave is an indication of right atrial enlargement and increase in width of P wave an indication of left atrial enlargement. When both atria are enlarged, both width and amplitude of the P wave are increased.