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Differences between fetal and postnatal circulations
| Circulation | Circuits | Site of gas exchange | Shunts | Perfusion rate, mL/kg/min | Heart rate (beats per min) | Vascular resistance |
|---|---|---|---|---|---|---|
| Fetal | Parallel | Placenta | DV, DA, FO | 470–500 | 110–160 | Pulmonary >systemic |
| Neonatal | Series | Lungs | Closure of shunts: | 200 | 100–120 | Systemic >pulmonary |
| DV → Ligamentum venosum | ||||||
| DA → Ligamentum arteriosum | ||||||
| FO → Fossa ovalis |
DV, ductus venosus; DA, ductus arteriosum; FO, foramen ovale.
