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Table 2 Characteristics of the pulmonary blood flow (PBF) waveform in fetuses before, during (at selected time points) and after in utero ventilation (IUV).

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

   In Utero Ventilation  
  Pre-IUV 20 min 2 hr 11 hr Post-IUV
Peak systolic flow (mL/min) 189.5 ± 30.5 228.4 ± 42.2 179.3 ± 32.3 177.0 ± 37.3 189.0 ± 34.9
Post-systolic minimum flow (mL/min) -78.6 ± 13.9a -32.5 ± 22.8b -68.8 ± 13.4a -80.8 ± 13.2a -75.4 ± 15.4a
End-diastolic flow (mL/min) -27.1 ± 4.4 -10.1 ± 13.9 -26.0 ± 6.5 -30.7 ± 7.2 -26.1 ± 0.3
Mean diastolic flow (mL/min) -17.7 ± 4.4a 18.4 ±2.2b -12.6 ± 3.7a -14.1 ± 3.0a -9.6 ± 5.1a
Pulsatility index 1.4 ± 0.0a 1.2 ± 0.1b 1.1 ± 0.1b 1.47 ± 0.0a 1.40 ± 0.0a
Pulse amplitude (mL/min) 207.8 ± 31.4 173.1 ± 37.2 188.4 ± 28.8 167.1 ± 34.1 213.1 ± 42.8
  1. Values that do not share a common letter are significantly different from each other (p< 0.05).