Table 3.

Average values of Doppler indexes and PDF parameters in one typical tilt table subject at three different preload states

Head UpHorizontalHead Down
Average Doppler indexes, one typical subject
Epeak, m/s0.50 (SD 0.05)0.55 (SD 0.05)0.70 (SD 0.04)
AT, s0.11 (SD 0.01)0.10 (SD 0.01)0.09 (SD 0.01)
DT, s0.16 (SD 0.03)0.14 (SD 0.02)0.13 (SD 0.01)
Edur, s0.27 (SD 0.03)0.24 (SD 0.03)0.22 (SD 0.02)
Apeak, m/s0.42 (SD 0.04)0.36 (SD 0.04)0.39 (SD 0.04)
Adur, s0.13 (SD 0.01)0.13 (SD 0.01)0.13 (SD 0.01)
E/A1.2 (SD 0.1)1.5 (SD 0.1)1.8 (SD 0.2)
HR, beats/min58 (SD 7)49 (SD 2)56 (SD 6)
Average PDF parameter values, same typical subject
c, × 103 (1/s)5.6 (SD 3.9)11.3 (SD 3.0)16.2 (SD 5.7)
k, × 103 (1/s2)113 (SD 24)198 (SD 31)249 (SD 21)
xo, m0.06 (SD 0.01)0.06 (SD 0.00)0.08 (SD 0.02)
  • Values are means (SD). Epeak, peak velocity of E-wave; AT, acceleration time; DT, deceleration time; Edur, duration of E-wave; Apeak, peak velocity of A-wave; Adur, duration of A-wave; E/A, ratio of E-wave to A-wave; HR, heart rate.