A 27-year-old pregnant woman of 30 weeks gestation has been administered terbutaline because of the onset of preterm labor. This drug is effective in stopping preterm labor because
A) it is an antagonist of endogenous oxytocin.
B) it stimulates beta-2 receptors, inhibiting contractility of smooth muscle.
C) it relaxes smooth muscle by decreasing the amount of free acetylcholine.
D) it prevents calcium influx into the cells for cellular contraction.
Question 2
The nurse has established peripheral IV access and begun an infusion of magnesium sulfate on a 29-year-old antepartum patient who is 35 weeks pregnant.
Which of the following assessment findings most likely prompted the patient's physician to order magnesium sulfate for this patient?
A) Decreased level of consciousness with a sudden onset
B) The presence of rales and rhonchi and oxygen saturation less than or equal to 80 on room air
C) Maternal bradycardia accompanied by a prolonged QT interval
D) Systolic blood pressure readings in excess of 190 mmHg
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