Magnesium sulfate is used as a tocolytic, but clinical efficacy has been seriously questioned. Our objective was to use controlled ex vivo conditions and known pregnancy stages, to investigate how 2 key factors, hormones and gestation, affect magnesium’s tocolytic ability. We hypothesized that these factors could underlie the varying clinical findings around magnesium’s efficacy. Myometrial strips were obtained from nonpregnant (n = 10), mid-pregnant (n = 12), and term-pregnant (n = 11) mouse uterus. The strips were mounted in organ baths superfused with oxygenated physiological saline at pH 7.4 and 37 °C. The effect of different concentrations of MgSO4 (2-20 mM) was examined on spontaneous and oxytocin-induced (0.5-1 nM) contractions. Contractile properties (amplitude, frequency, and area under the curve) were measured before and after application of magnesium. Magnesium sulfate had a dose-dependent inhibitory effect on both spontaneous and oxytocin-induced contractions but was less effective in the presence of oxytocin. In spontaneous contractions, magnesium was more potent as gestation progressed (P
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Osaghae, B. E., Arrowsmith, S., & Wray, S. (2020). Gestational and Hormonal Effects on Magnesium Sulfate’s Ability to Inhibit Mouse Uterine Contractility. Reproductive Sciences, 27(8), 1570–1579. https://doi.org/10.1007/s43032-020-00185-8
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