Magnesium ion inhibits spontaneous and induced contractions of isolated uterine muscle

Aug 19, 2007Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology

Magnesium reduces natural and triggered contractions in isolated uterine muscle

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Abstract

Magnesium sulfate reduced spontaneous myometrial contractions by up to 100% at a concentration of 3 mM.

  • The relaxant effect of magnesium sulfate on myometrial contractions was observed in both pregnant and non-pregnant women.
  • Spontaneous contractions decreased in a dose-dependent manner, with significant reductions at concentrations of 2.0-2.5 mM.
  • Oxytocin-induced contractions were reduced by 30-40% at an 8 mM concentration, with further reductions at higher concentrations.
  • Maximum effects on induced contractions were noted at 20 minutes, indicating both dose and time dependency.
  • No significant differences were found in the response of pregnant versus non-pregnant myometrium.

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