FIG. 4. Measurements of pulse wave velocity (PWV) by Doppler echocardiographic recoding of 2 aortic sites. T1: time interval between the peak R wave on electrocardiography and the onset of PW Doppler signal of the descending thoracic aorta, T2: time interval between the peak R wave on electrocardiography and the onset of PW Doppler signal of the abdominal aortic bifurcation. D: distance between the beginning site of the descending thoracic aorta and the just above site of the abdominal aortic bifurcation. PWV can be calculated as (T2-T1)/(D).
