Figure 2. Measurement of carotid-femoral pulse wave velocity with the foot-to- foot method. Measurement of carotid-femoral pulse wave velocity with the foot-to-foot method. The waveforms are usually obtained transcutaneously, at the right common carotid artery and the right femoral artery. The time delay (Δt, or transit time) is measured between the feet of the two waveforms (Figure 1). The distance (ΔL) covered by the waves is usually the surface distance between two recording sites, i.e., the common carotid and the femoral artery. Pulse wave velocity (PWV) is calculated as PWV = 0.8 x ΔL (m)/Δt (s). Source: the authors.