Pulse Wave Velocity as Marker of Preclinical Arterial Disease: Reference Levels in a Uruguayan Population Considering Wave Detection Algorithms, Path Lengths, Aging, and Blood Pressure
Figure 1
(a) Algorithms employed to determine the carotid-femoral pulse transit time (PTT): intersecting tangent algorithm (tang) and maximal upstroke during systole (max.up). (b) Distances employed to determine the carotid-femoral PWV. Distance A: direct distance between the carotid and femoral region (direct). Distance B: distance between the sternal notch and the femoral region (sn-fem). Distance C: subtracted distance, obtained as B minus the carotid to sternal notch distance (subtracted). Combing the two PTT algorithms and the three distances, six PWV were quantified: PWVdirect/tang, PWVdirect/max.up, PWVsn-fem/tang, PWVsn-fem/max.up, PWVsubtracted/tang, and PWVsubtracted/max.up. In addition the real PWV was calculated (see text).
