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[In Process Citation]

Gross, Schroder, Schleussner

    Zentralblatt Fur Gynakologie
    |July 10, 1999
    PubMed
    Summary

    Flunarizine and Verapamil readily cross the placenta, accumulating in placental tissue. These calcium antagonists stimulate placental beta-human chorionic gonadotropin (β-hCG) synthesis without altering placental metabolism.

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    Area of Science:

    • Pharmacology
    • Reproductive Biology
    • Toxicology

    Background:

    • Calcium antagonists like Flunarizine and Verapamil are used clinically.
    • Understanding their placental transfer and effects is crucial for fetal safety.
    • Limited data exists on the placental transfer and metabolic impact of these specific agents.

    Purpose of the Study:

    • To investigate the placental transfer kinetics of Flunarizine and Verapamil.
    • To assess the impact of Flunarizine and Verapamil on human placental metabolism.
    • To evaluate the effects of these calcium antagonists on placental hormone synthesis.

    Main Methods:

    • Dual in vitro perfusion of human placental lobules.
    • Perfusion with Flunarizine or Verapamil (10 µg/ml) for 6 hours.
    • Measurement of placental transfer, tissue accumulation, and metabolic markers (glucose consumption, lactate production, β-hCG synthesis).

    Main Results:

    • Flunarizine and Verapamil rapidly crossed the placental barrier but were significantly accumulated in placental tissue.
    • Verapamil exhibited a higher placental transfer rate compared to Flunarizine.
    • Neither drug altered placental glucose consumption or lactate production.
    • Both Flunarizine and Verapamil stimulated placental beta-human chorionic gonadotropin (β-hCG) synthesis into the maternal circulation.

    Conclusions:

    • Flunarizine and Verapamil demonstrate significant placental transfer and accumulation.
    • These calcium antagonists do not adversely affect key placental metabolic functions.
    • Stimulation of placental β-hCG synthesis warrants further investigation regarding potential endocrine effects.

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