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  • Title: Does continuing oral magnesium supplementation until delivery affect labor and puerperium outcome?
    Author: Meier B, Huch R, Zimmermann R, von Mandach U.
    Journal: Eur J Obstet Gynecol Reprod Biol; 2005 Dec 01; 123(2):157-61. PubMed ID: 15899543.
    Abstract:
    OBJECTIVE: To determine the labor and puerperal impact of continuing oral magnesium supplementation until delivery. STUDY DESIGN: Single-center study with matched controls. In 40 pairs of healthy women with vaginally delivered singleton pregnancies, matched for maternal age, race and parity, maternal and neonatal outcome endpoints were compared in those receiving continuous oral magnesium aspartate supplementation 15-30 mmol/d for at least 4 weeks until delivery (for constipation, calf cramps, preterm contraction without cervical effacement or additional tocolytics) versus non-supplemented controls. RESULTS: In the magnesium group labor was nonsignificantly longer (stage 1: 326.0+/-187.5 min versus 276.7+/-140.8 min, P = 0.19; stage 2: 52.0+/-44.5 min versus 43.5+/-44.0 min, P = 0.40) and maximum oxytocin dose nonsignificantly higher (14.5+/-9.4 [median 12.0; n=15] versus 10.5+/-6.9 [median 7.5] mU/min, P = 0.28; n = 10). Fewer women had afterpains (12 versus 20, P=0.11), required spasmolysis (3 versus 14, P = 0.005), or could breastfeed their infants exclusively at discharge (24 versus 34, P = 0.04). CONCLUSION: Continuing oral magnesium supplementation until delivery does not significantly prolong labor or increase the oxytocin requirement, but it significantly impairs breastfeeding competence.
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