Central shunt flows and pressures in the mature fetal lamb.

Debra Anderson, J. M. Bissonnette, J. J. Faber, Kent Thornburg

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Two to eight days after surgery, we determined biventricular cardiac output with the microsphere-dilution method and individual ventricular output with an electromagnetic flow sensor in 12 fetal lambs. Mean biventricular output was 462 ml.min-1.kg-1. Right ventricular output was 60%, pulmonary blood flow was 6%, blood flow in the ductus arteriosus was 54%, flow through the foramen ovale was 34%, and flow in the descending thoracic aorta above the ductus arteriosus was 12% of the biventricular cardiac output. Foramen ovale flow did not correlate with the pressure difference between the atria. The flow though the foramen ovale correlated positively with the flow in the inferior caval vein. It was concluded the shunt flow through the foramen ovale is mainly determined by the kinetic energy of the blood in the "lower atrial inflow tract." Fetal systemic somatic blood flow showed a reliable negative correlation with the oxygen tension in the fetal arterial blood. This was taken as presumptive evidence for long-term autoregulation of flow in the peripheral tissues.

Original languageEnglish (US)
JournalThe American journal of physiology
Volume241
Issue number1
StatePublished - Jul 1981
Externally publishedYes

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Foramen Ovale
Ductus Arteriosus
Pressure
Thoracic Aorta
Cardiac Output
Venae Cavae
Electromagnetic Phenomena
Ambulatory Surgical Procedures
Fetal Blood
Microspheres
Veins
Homeostasis
Oxygen
Lung

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Central shunt flows and pressures in the mature fetal lamb. / Anderson, Debra; Bissonnette, J. M.; Faber, J. J.; Thornburg, Kent.

In: The American journal of physiology, Vol. 241, No. 1, 07.1981.

Research output: Contribution to journalArticle

Anderson, Debra ; Bissonnette, J. M. ; Faber, J. J. ; Thornburg, Kent. / Central shunt flows and pressures in the mature fetal lamb. In: The American journal of physiology. 1981 ; Vol. 241, No. 1.
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