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Articles

Effect of Exteriorization of the Sheep Fetus on Its Cardiovascular Function

MICHAEL A. HEYMANN, ABRAHAM M. RUDOLPH
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https://doi.org/10.1161/01.RES.21.5.741
Circulation Research. 1967;21:741-746
Originally published November 1, 1967
MICHAEL A. HEYMANN
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ABRAHAM M. RUDOLPH
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Abstract

Exteriorized sheep or goat fetuses, with placental circulation continuing, have been extensively used for measurements of fetal cardiovascular function. However, the effects of this procedure on fetal cardiovascular function have not been assessed. We inserted vinyl catheters into an umbilical vein, an umbilical or fetal hindlimb artery, and a hindlimb vein. We measured umbilical arterial and venous blood gas tensions, umbilical blood flow using the steadystate diffusion antipyrine method, and fetal arterial and umbilical venous pressures before and after delivery by cesarean section. Following exteriorization, placental vascular resistance consistently increased and umbilical blood flow decreased. Umbilical venous Po2 increased, but umbilical arterial and venous pH and Pco2 and arterial Po2 did not change significantly. Thus exteriorization of the fetus produces major changes in the fetal circulation, but these changes are not indicated by any major alterations in fetal blood gases and pH.

  • fetal exteriorization
  • umbilical blood flow
  • fetal blood gas tensions
  • placental vascular resistance
  • antipyrine method
  • electromagnetic flowmeter
  • Accepted September 29, 1967.
  • © 1967 American Heart Association, Inc.
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Circulation Research
November 1, 1967, Volume 21, Issue 5
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    Effect of Exteriorization of the Sheep Fetus on Its Cardiovascular Function
    MICHAEL A. HEYMANN and ABRAHAM M. RUDOLPH
    Circulation Research. 1967;21:741-746, originally published November 1, 1967
    https://doi.org/10.1161/01.RES.21.5.741

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    Effect of Exteriorization of the Sheep Fetus on Its Cardiovascular Function
    MICHAEL A. HEYMANN and ABRAHAM M. RUDOLPH
    Circulation Research. 1967;21:741-746, originally published November 1, 1967
    https://doi.org/10.1161/01.RES.21.5.741
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