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Related Experiment Videos

Interrelation between ventricular function, myocardial blood flow, and O2 consumption changes at birth in lambs

J J Smolich1, P J Berger, A M Walker

  • 1Institute of Reproduction and Development, Monash University, Clayton, Victoria, Australia.

The American Journal of Physiology
|February 1, 1996
PubMed
Summary

The study reveals a shift from fetal right ventricular (RV) to newborn left ventricular (LV) dominance, driven by increased LV performance and altered blood flow patterns. Postnatal LV oxygen consumption rises due to enhanced O2 extraction, not increased blood flow, with stable mechanical efficiency.

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Area of Science:

  • Cardiovascular Physiology
  • Neonatal Adaptation
  • Fetal Circulation

Background:

  • The transition from fetal to neonatal circulation involves significant changes in ventricular workload and myocardial perfusion.
  • Understanding the interplay between external work, blood flow, and oxygen consumption is crucial for neonatal adaptation.

Purpose of the Study:

  • To investigate the interrelation of changes in ventricular external work, myocardial blood flow, and oxygen consumption at birth in sheep.
  • To elucidate the mechanisms underlying the shift in ventricular dominance and myocardial perfusion patterns postnatally.

Main Methods:

  • Instrumented fetal sheep underwent measurements of hemodynamics, ventricular outputs, myocardial blood flow (using radioactive microspheres), and left ventricular oxygen consumption.
  • Measurements were repeated in fetuses and then at 1 and 4 hours after cesarean section delivery.

Related Experiment Videos

  • Calculations included ventricular minute work, myocardial blood flow per gram, and external work per unit of myocardial blood flow.

    • Main Results:

    • A switch from fetal right ventricular (RV) dominance to newborn left ventricular (LV) dominance was observed, linked to increased LV pumping performance.
    • Myocardial blood flow patterns shifted, with a predominant fall in RV myocardial blood flow postnatally.
    • Postnatal LV oxygen consumption increased due to enhanced arteriovenous O2 extraction, while external work per unit of myocardial blood flow rose, particularly in the LV.

    Conclusions:

    • The transition to neonatal circulation involves a shift in ventricular dominance and myocardial blood flow distribution.
    • Increased LV oxygen consumption postnatally is primarily driven by enhanced O2 extraction, not augmented myocardial blood flow.
    • Left ventricular mechanical efficiency remains unchanged after birth, despite alterations in workload and perfusion.