A nurse is admitting a client who has a diagnosis of preterm labor. The nurse anticipates an order by the provider for which of the following medications?

Choice A reason: Uterine enlargement greater than expected for gestational age is not a typical manifestation of ectopic pregnancy, because the embryo is implanted outside the uterus, usually in the fallopian tube. The uterus may be slightly enlarged due to hormonal changes, but not more than expected for the gestational age.

Choice B reason: Unilateral, cramp-like abdominal pain is a common manifestation of ectopic pregnancy, because the embryo grows and stretches the fallopian tube, causing inflammation and irritation. The pain may be mild or severe, depending on the size and location of the ectopic pregnancy, and may radiate to the shoulder or back.

Choice C reason: Severe nausea and vomiting is not a specific manifestation of ectopic pregnancy, because it can be caused by other conditions, such as hyperemesis gravidarum, gastroenteritis, or appendicitis. The client may have mild nausea and vomiting due to hormonal changes, but not more than usual for the gestational age.

Choice D reason: Large amount of vaginal bleeding is not a usual manifestation of ectopic pregnancy, because the bleeding is usually internal, into the abdominal cavity. The client may have spotting or light bleeding due to the detachment of the endometrium, but not heavy or profuse bleeding.

Choice A reason: Obtaining a type and crossmatch is not the first action that the nurse should take, as it is a preparatory step for blood transfusion, which may or may not be needed. The nurse should first identify the cause and severity of the hypotension, and initiate immediate interventions to stop the bleeding and restore the circulation.

Choice B reason: Administering oxytocin infusion is not the first action that the nurse should take, as it is a pharmacological intervention that requires a prescription and an assessment of the uterine tone and bleeding. The nurse should first evaluate the firmness of the uterus and massage it if needed, to stimulate the contraction and retraction of the uterine muscle.

Choice C reason: Initiating oxygen therapy by nonrebreather mask is not the first action that the nurse should take, as it is a supportive intervention that aims to improve the oxygen delivery to the tissues and organs. The nurse should first address the underlying cause of the hypotension, which is most likely postpartum hemorrhage, and prevent further blood loss and shock.

Choice D reason: Evaluating the firmness of the uterus is the first action that the nurse should take, as it can help determine the source and extent of the bleeding, and guide the subsequent interventions. The nurse should palpate the fundus and check the lochia, and report any signs of uterine atony, which is the most common cause of postpartum hemorrhage.