Your patient is receiving magnesium sulfate for neuroprotection and preterm labor at 1 gram/hour. The most concerning vital sign below is:

Choice A: Applying warm, moist soaks to the client's lower legs is not an effective intervention, as it can increase the swelling and the discomfort of the legs and interfere with the healing of the incision. The nurse should avoid applying heat to the legs and use compression stockings or pneumatic devices insteaD.

Choice B: Having the client ambulate frequently in the hallway is an effective intervention, as it can improve the blood circulation and prevent the formation of blood clots in the legs. The nurse should encourage the client to ambulate as soon as possible after the surgery and assist the client with the first ambulation.

Choice C: Keeping the client on bed rest is not an appropriate intervention, as it can increase the stasis and the coagulation of the blood and increase the risk of thrombophlebitis. The nurse should avoid prolonged bed rest and promote early mobilization of the client.

Choice D: Placing pillows under the client's knees while she is resting in bed is not an appropriate intervention, as it can impair the venous return and increase the pressure and the inflammation of the legs. The nurse should avoid placing anything under the client's knees and keep the legs slightly elevated and in a straight position.

Choice A: Thromboembolic events are not prevented by methylergonovinE. Thromboembolic events are blood clots that can form in the veins or arteries and cause serious complications such as pulmonary embolism or strokE. Methylergonovine is a uterotonic agent that stimulates the contraction of the uterus and can actually increase the risk of thromboembolic events by causing vasoconstriction and hypertension.

Choice B: Postpartum hemorrhage is prevented by methylergonovinE. Postpartum hemorrhage is excessive bleeding after delivery that can result from uterine atony, retained placenta, or lacerations. Methylergonovine is a uterotonic agent that stimulates the contraction of the uterus and helps control the bleeding by compressing the blood vessels and expelling any placental fragments.

Choice C: Postpartum infection is not prevented by methylergonovinE. Postpartum infection is a bacterial infection that can affect the uterus, the vagina, the bladder, or the breast after delivery. Methylergonovine is a uterotonic agent that has no antibacterial activity and can actually increase the risk of infection by causing fever and chills.

Choice D: Hypertension is not prevented by methylergonovinE. Hypertension is high blood pressure that can cause complications such as preeclampsia, eclampsia, or strokE. Methylergonovine is a uterotonic agent that can actually cause or worsen hypertension by stimulating the alpha-adrenergic receptors and causing vasoconstriction.