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Fetal cardiovascular physiology and therapy.

C S Kleinman1, J A Copel

  • 1Department of Pediatrics, Yale University School of Medicine, New Haven, CT 06510.

Fetal Diagnosis and Therapy
|January 1, 1992
PubMed
Summary

Prenatal diagnosis of fetal heart defects has advanced, but understanding fetal cardiovascular physiology is crucial for interventions. Human fetal hearts show less right-ventricular dominance and limited reserves, making them sensitive to volume and afterload changes.

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Area of Science:

  • Cardiovascular Physiology
  • Fetal Medicine
  • Echocardiography

Background:

  • Prenatal diagnosis of fetal cardiovascular malformations has improved significantly.
  • This progress fuels interest in neonatal therapy and prenatal interventions.
  • Understanding fetal cardiovascular physiology is essential before intervention.

Purpose of the Study:

  • To elucidate normal and abnormal human fetal cardiovascular physiology.
  • To correlate echocardiographic findings with physiological data.
  • To inform the approach to prenatal interventions.

Main Methods:

  • Utilized data from fetal lamb models.
  • Correlated anatomic, pulsed Doppler, and color flow Doppler echocardiography.
  • Analyzed regional blood flow distribution and ventricular filling characteristics.

Main Results:

  • Human fetuses exhibit lesser right-ventricular volume dominance than lambs.
  • Human fetal hearts have limited diastolic and systolic reserves, increasing sensitivity to volume overload and afterload.
  • Altered shunt flow across the ductus arteriosus and foramen ovale can be recognized and linked to malformations.

Conclusions:

  • Human fetal cardiovascular physiology presents unique characteristics influencing intervention strategies.
  • Limited cardiac reserves make the fetus susceptible to hemodynamic stress.
  • Caution is advised for surgical interventions due to uncertainties about the causality of altered shunt flow patterns in malformations.

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