Fig. 5.

Changes in metrics between fast and slow pacing (left). Changes in the maximum dipole and QRS area are expressed as percentage changes from their value for BCL $=$$600\mathrm{ms}$. The mean unit weighted dipoles for the VCG during QRS are shown (right); a solid line represents the value for BCL $=$$300\mathrm{ms}$, a dashed line for BCL $=$$600\mathrm{ms}$.