In the last lesson, we saw how it is that surface electrocardiography works:
- The heart can be modelled as a single net dipole moment that represents the cumulative effect of all the electrical activity in the heart.
- This net dipole moment generates an electric field that extends out to the skin.
- Putting electrodes at different points on the skin help us measure the potential difference across the electric field in strategic ways.
- The potential difference measured helps us deduce the magnitude and direction of the net dipole moment, to help us understand the strength and direction of electrical activity in the heart.
