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[0] A woman in preterm labor at 30 weeks of gestation receives two 12-mg doses of betamethasone intramuscularly. The purpose of this pharmacologic treatment is to: [1] >>Stimulate fetal surfactant production. [2] Reduce maternal and fetal tachycardia associated with ritodrine administration. [3] Suppress uterine contractions. [4] 
Maintain adequate maternal respiratory effort and ventilation during magnesium sulfate therapy.
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