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Catecholamine responses to changes in posture during human pregnancy.

P G Whittaker, J Gerrard, T Lind

    British Journal of Obstetrics and Gynaecology
    |June 1, 1985
    PubMed
    Summary
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    Pregnant women exhibit a blunted cardiovascular response to standing compared to non-pregnant individuals. This altered pressor sensitivity during pregnancy may contribute to hypertension development.

    Area of Science:

    • Cardiovascular Physiology
    • Reproductive Endocrinology
    • Human Physiology

    Background:

    • Pregnancy can alter cardiovascular system sensitivity to catecholamines.
    • Investigated multigravid women with low risk of vascular disease.

    Purpose of the Study:

    • Assess cardiovascular and noradrenergic responses to postural change in late pregnancy.
    • Compare responses between pregnant and non-pregnant women.

    Main Methods:

    • Measured blood pressure, pulse rate, plasma noradrenaline, and adrenaline.
    • Assessed responses to standing from semi-recumbency in 6 pregnant and 6 non-pregnant women.

    Main Results:

    • Non-pregnant women showed increased blood pressure, pulse rate, and noradrenaline upon standing.

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  • Pregnant women had higher basal noradrenaline, a slower response to standing, and less cardiovascular impact.
  • Pregnant women experienced a blood pressure drop and unaffected pulse rate upon standing.

    • Conclusions:

    • Pregnancy may attenuate the pressor response to postural changes.
    • Some women might retain non-pregnant pressor sensitivity, increasing hypertension risk during pregnancy.