EPU Electrophysiology Practice Exam

The key idea is that voltage mapping and activation mapping focus on different aspects of the electrogram. Voltage mapping looks at how large the signal is at each site—its amplitude—across the mapped area, which helps identify scar or diseased tissue by low-voltage regions. Activation mapping, on the other hand, records the exact timing of when each site activates, building a picture of the wavefront’s sequence and propagation.

So, describing voltage mapping as comparing amplitude and activation mapping as comparing timing captures the essential difference. The other statements either mix up what each map measures or claim they measure the same thing, which isn’t accurate, and they’re not used in electrophysiology.