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[Cardiopulmonary adaptation to birth].

C Huon1, G Moriette

  • 1Service de médecine néonatale, Hôpital Port-Royal, Paris.

Revue Des Maladies Respiratoires
|January 1, 1988
PubMed
Summary

Fetal circulation features unique adaptations like the ductus arteriosus and foramen ovale for placental gas exchange. At birth, these shunts close, enabling the newborn

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Area of Science:

  • Cardiovascular Physiology
  • Respiratory Physiology

Context:

  • The fetal cardiopulmonary system exhibits specialized circulatory pathways to facilitate gas exchange via the placenta.
  • Key fetal structures include the ductus arteriosus and foramen ovale, which allow shunting of blood between systemic and pulmonary circulations.
  • Pulmonary vascular resistance is high in the fetus, limiting blood flow to the lungs.

Purpose:

  • To describe the unique cardiopulmonary adaptations in the fetus and the dramatic circulatory and respiratory transitions that occur at birth.
  • To explain the physiological mechanisms enabling a newborn to transition to extrauterine life and independent respiration.

Summary:

  • Fetal circulation utilizes shunts like the ductus arteriosus and foramen ovale, with the placenta handling gas exchange. Fetal lungs are fluid-filled and have high resistance.
  • At birth, pulmonary vascular resistance decreases, lungs inflate, and surfactant production facilitates gas exchange. The ductus arteriosus and foramen ovale close, establishing adult-like circulation.
  • The newborn transitions from placental to pulmonary respiration, with the two ventricles functioning in series and the lungs taking over gas exchange.

Impact:

  • Understanding these transitional changes is crucial for identifying and managing congenital heart defects and respiratory distress syndrome in newborns.
  • This knowledge aids in the clinical management of premature infants and the physiological assessment of neonatal adaptation to extrauterine life.
  • Elucidates the critical physiological shifts required for neonatal survival and independent respiratory function.

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