Figure 6.

Measurement of carotid-femoral pulse wave velocity with the foot-to-foot method. From Laurent et al. (1), with permission. 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. The distance (ΔL) covered by the waves is usually assimilated to the surface distance between the two recording sites, i.e., the common carotid artery and the common femoral artery. PWV is calculated as PWV = 0.8 × ΔL (meters)/Δt (seconds).