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Related Experiment Videos

[Recent physiologic and pathophysiologic studies in heart function in the perinatal period].

H Schwartze1

  • 1Institut für Pathologische Physiologie, Karl-Marx-Universität, Leipzig.

Zentralblatt Fur Gynakologie
|January 1, 1988
PubMed
Summary

Fetal lambs direct most left ventricular output to the upper body. Postnatal cardiac contractility relies on thyroid hormones (T3) influencing beta-receptors for proper development.

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Area of Science:

  • Cardiovascular Physiology
  • Developmental Biology
  • Endocrinology

Context:

  • Investigating fetal and neonatal lamb cardiac output distribution.
  • Examining the impact of afterload on stroke volume.
  • Assessing the Frank-Starling mechanism's role in lambs.

Purpose:

  • To elucidate the distribution patterns of left and right ventricular output in fetal lambs.
  • To understand the factors influencing myocardial contractility immediately after birth.
  • To explore the relationship between thyroid function and postnatal cardiac adaptation.

Summary:

  • Left ventricular output predominantly perfuses the upper body (head, neck, forelegs) via the ascending aorta in fetal lambs.
  • Right ventricular output mainly supplies the descending aorta through the ductus arteriosus.

Related Experiment Videos

  • Increasing afterload reduces stroke volume in both fetal and neonatal lambs, with a weakly developed Frank-Starling mechanism.
  • Postnatal myocardial contractility increase is linked to sympathoadrenergic stimulation and critically depends on prenatal thyroid hormone (T3) function, likely via effects on cardiac beta-receptors.

    • Impact:

    • Highlights the distinct circulatory roles of the ventricles in fetal lambs.
    • Underscores the limited Frank-Starling mechanism in neonatal lambs.
    • Establishes a critical link between maternal thyroid function during gestation and neonatal cardiac adaptation.
    • Suggests T3's crucial role in prenatal development of cardiac beta-adrenergic receptors, impacting postnatal cardiac function.