Table 2

Correlation of PW Doppler and CW Doppler Velocities and Time Intervals

ModalityVariablePW DopplerCW Dopplerrp Value
Flow velocityV12.64 ± 0.562.45 ± 0.500.979<0.001
 (m/s)Vn1.07 ± 0.370.91 ± 0.330.948<0.001
V21.77 ± 0.491.48 ± 0.400.893<0.001
Time intervalPEP83 ± 1881 ± 170.873<0.001
 (ms)Q to V1164 ± 47170 ± 420.908<0.001
Q to Vn260 ± 60264 ± 650.944<0.001
Q to V2355 ± 60351 ± 550.888<0.001
ETime324 ± 46323 ± 480.907<0.001

CW = continuous-wave; ETime = ejection duration; PEP = pre-ejection period; PW = pulsed-wave; Q to V1 = time to first peak; Q to V2 = time to second peak; Q to Vn = time to nadir of midsystolic drop; V1 = first peak of left ventricular ejection velocity; V2 = second peak; Vn = nadir of the midsystolic drop.