• Pre- & Post-Ductal
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  • Why do we check both pre- and post-ductal saturations in cardiac babies?
    To detect shunting across the ductus arteriosus and see if there's a difference in oxygen delivery to the upper vs lower body
  • Why is it concerning when pre-and post-ductal saturations differ by more than 10% in ductal dependent systemic circulatiom?
    It means the difference in DO2 to the upper & lower body is ↑ : PH/high PVR, restrictive/closing pda (systemic), flow to lungs < systemic
  • Where are pre- and post- ductal probes placed?
    Pre= right hand and post= either foot. Right hand = flow to brain, feet= lower body
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