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Related Experiment Videos

Hemodynamic changes during pregnancy in the rabbit.

B Nuwayhid

    American Journal of Obstetrics and Gynecology
    |November 1, 1979
    PubMed
    Summary

    Maternal blood volume, plasma volume, and red cell volume increase significantly during rabbit pregnancy, peaking in the second trimester. Cardiac output also peaks then, followed by decreases, indicating major physiological adaptations.

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    Area of Science:

    • Physiology
    • Reproductive Biology
    • Maternal-Fetal Medicine

    Background:

    • Pregnancy induces significant physiological changes in maternal circulation.
    • Understanding hemodynamic adaptations is crucial for assessing maternal and fetal well-being.

    Purpose of the Study:

    • To quantify changes in blood volume, cardiac output, and organ blood flow during rabbit gestation.
    • To investigate the redistribution of blood flow within reproductive organs during pregnancy.

    Main Methods:

    • Measurements of blood volume (BV), plasma volume (PV), red cell volume (RCV), and cardiac output (CO) in nonpregnant and pregnant rabbits at different gestational stages.
    • Assessment of organ blood flow, including reproductive organs, spleen, liver, lungs, and kidneys.

    Main Results:

    • BV, PV, and RCV increased throughout gestation, with peak increases in the second third.
    • Cardiac output peaked during the second third of gestation, then declined.
    • Reproductive organ blood flow redistributed, with increased ovarian and placental flow per unit weight, and decreased myometrial flow per unit weight.

    Conclusions:

    • Significant hemodynamic adaptations occur during the first two-thirds of gestation, testing maternal physiological capacity.
    • The final third of gestation is characterized by fetoplacental unit interactions and continued adaptation.

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