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Perinatal effects of nicotine.

H A Nasrat, G M Al-Hachim, F A Mahmood

    Biology of the Neonate
    |January 1, 1986
    PubMed
    Summary

    Pregnant mice exposed to nicotine experienced increased perinatal mortality. High doses, particularly in the second and third trimesters, significantly shortened gestation periods, highlighting risks of smoking during pregnancy.

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    Area of Science:

    • Perinatal toxicology
    • Reproductive toxicology
    • Pharmacology

    Background:

    • Nicotine is a primary alkaloid in tobacco smoke.
    • Maternal smoking during pregnancy is a significant public health concern.
    • Understanding nicotine's specific impact on different pregnancy stages is crucial.

    Purpose of the Study:

    • To investigate the effects of varying nicotine doses on perinatal outcomes in pregnant mice.
    • To determine the most vulnerable stage of gestation to nicotine exposure.
    • To assess nicotine's impact on gestation length, delivery rates, offspring sex ratio, and perinatal mortality.

    Main Methods:

    • Three groups of pregnant Swiss albino mice received daily subcutaneous nicotine doses (900, 1,800, 2,700 µg/kg).
    • Nicotine administration occurred during each of the three trimesters of pregnancy.
    • Observed perinatal effects included gestation period, delivery success, offspring sex ratio, stillbirths, and neonatal deaths.

    Main Results:

    • Nicotine administration generally increased perinatal mortality across all doses and trimesters.
    • Significant shortening of the gestation period was observed with high nicotine doses, especially in the second and third trimesters (p < 0.05; p < 0.01).
    • The study identified late pregnancy stages as particularly sensitive to nicotine's adverse effects.

    Conclusions:

    • Maternal nicotine exposure negatively impacts perinatal outcomes, including increased mortality and shortened gestation.
    • Late pregnancy (second and third trimesters) appears most vulnerable to nicotine-induced adverse effects.
    • Pregnant individuals should be strongly advised against smoking due to the demonstrated risks to fetal development and survival.

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