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Table 3 Characteristics of the pulmonary blood flow (PBF) waveform in fetuses before during (at selected time points) and after in uter o ventilation (IUV).

From: Pulmonary hemodynamic responses to in utero ventilation in very immature fetal sheep

  RESPONDERS NON RESPONDERS
  PRE-IUV 20 min 2 hrs 11 hrs POST IUV PRE-IUV 20 min 2 hrs 11 hrs POST-IUV
Peak systolic flow (mL/min) 179 ± 54a 234 ± 65b 173 ± 54a 174 ± 54a 159 ± 46a 203 ± 19xy 220 ± 14xy 187 ± 36x 181 ± 33xy 247 ± 1x
Post-systolic minimum flow (mL/min) -65.9 ± 22 11.5 ± 14 -52.9 ± 12 -75.0 ± 19 -66.2 ± 20 -71.6 ± 11 -90.3 ± 14 -89.8 ± 24 -88.5 ± 21 -94.0 ± 16
End-diastolic flow (mL) -22.6 ± 6.5a 11.5 ± 10.9b -19.1 ± 5.0a -28.1 ± 8.8a -24.2 ± 7.4a -33.2 ± 1.3 -38.8 ± 0.7 -35.3 ± 13.1 -34.1 ± 9.6 -29.9 ± 5.6
Mean diastolic flow (mL) -10.9 ± 4.7a 49.0 ± 16.5b -6.1 ± 2.7a -15.3 ± 2.3a -15.4 ± 4.7a -26.8 ± 4.0 -22.4 ± 5.2 -21.2 ± 4.2 -15.7 ± 6.2 -17.7 ± 10.7
Pulsatility index 1.4 ± 0.0a 1.0 ± 0.0b 1.0 ± 0.1b 1.5 ± 0.0a 1.4 ± 0.0a 1.5 ± 0.0 1.4 ± 0.0 1.2 ± 0.2 1.5 ± 0.0 1.4 ± 0.1
Pulse amplitude (mL/min) 193 ± 54 162 ± 34 167 ± 47 170 ± 44 165 ± 48 227 ± 24 230 ± 15 216 ± 46 212 ± 35 242 ± 2
  1. Values that do not share a common letter are significantly different from each other (p< 0.05). Overall in all parameters measured, the responding fetuses were significantly different to the non-responding fetuses (p<0.001).