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Related Experiment Videos

Vascular catecholamine sensitivity during pregnancy in the ewe.

M K McLaughlin1, T M Keve, R Cooke

  • 1Department of Obstetrics and Gynecology, University of Vermont College of Medicine, Burlington 05405.

American Journal of Obstetrics and Gynecology
|January 1, 1989
PubMed
Summary

Pregnancy alters alpha-adrenergic sensitivity in ewes, affecting regional blood flow. This study reveals complex changes in the adrenergic system during gestation, impacting drug responses.

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Area of Science:

  • Reproductive physiology
  • Cardiovascular pharmacology
  • Adrenergic signaling

Background:

  • Pregnancy significantly impacts maternal physiology, including cardiovascular function.
  • Understanding alterations in adrenergic sensitivity during pregnancy is crucial for managing maternal and fetal health.

Purpose of the Study:

  • To investigate the hypothesis that pregnancy modifies alpha-adrenergic sensitivity in the external iliac artery blood flow of ewes.
  • To elucidate the specific effects of pregnancy on the response to alpha-adrenergic agonists.

Main Methods:

  • Chronic instrumentation of pregnant and castrated ewe models for external iliac blood flow measurement.
  • Generation of complete dose-response curves to alpha-adrenergic agents: methoxamine, phenylephrine, and norepinephrine.

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Main Results:

  • Pregnancy did not alter sensitivity to methoxamine.
  • Increased sensitivity to phenylephrine was observed in pregnant ewes.
  • Decreased sensitivity to norepinephrine was noted in pregnant ewes.

Conclusions:

  • Differential changes in drug sensitivity suggest functional similarity in alpha 1-receptor populations.
  • Pregnancy may involve inhibited uptake 1 mechanisms and altered catechol-O-methyltransferase activity or changes in alpha 2/beta-receptor populations.
  • The adrenergic system undergoes complex modifications during pregnancy, impacting regional circulation.