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Antenatal Magnesium Sulfate Exposure and Ponderal Index in Preterm Infants

Antenatal Magnesium Sulfate Exposure and Ponderal Index in Preterm Infants

American Journal of Perinatology 36(3): 329-334

ISSN/ISBN: 0735-1631

PMID: 30112756

DOI: 10.1055/s-0038-1667375

Antenatal magnesium sulfate (MgSO4) is known to affect the central nervous system of preterm infants, and there is biologic rationale for influence on other phenotypes. This study investigated the effect of MgSO4 exposure on the trajectory of ponderal index (PI, kg/m3) from birth to 2 years of age. A secondary analysis of a U.S. randomized controlled trial investigating MgSO4 versus placebo administration among women at high risk for preterm delivery was performed. Multivariable logistic regression was used to assess the relationship between PI from birth to 2 years of age and exposure to MgSO4 versus placebo. There was a larger decrement in PI from birth to 2 years of age in infants exposed to MgSO4 compared with placebo (p = 0.032). There was a statistically significant one-way interaction between newborn sex and treatment group (p = 0.019). Change in PI in males exhibited a greater decrement in those exposed to MgSO4 versus placebo (p = 0.227), whereas female infants exposed to MgSO4 had a smaller decrement (p = 0.04). MgSO4 exposure in preterm infants is associated with a larger decrease in PI from birth to 2 years of age. In addition, the direction of effect of MgSO4 on the change in PI over the first 2 years of life is different by sex.

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Accession: 048148299

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