The provider orders magnesium sulfate to treat a primigravida client's severe pre-eclampsia.

The medication is available as 60 grams of magnesium sulfate in 1000 mL of lactated ringer's at a rate of 4 grams/hr. What is the starting rate of the infusion? Record numerical answers only.

Round the answer to the nearest whole number.

Choice A rationale

Increased pain with urination, known as dysuria, is a primary symptom often associated with a urinary tract infection (UTI), not specifically polyhydramnios. While an enlarged uterus could theoretically cause compression and urinary symptoms, dysuria is a localized inflammatory response from the lower urinary tract, caused by microbial pathogens ascending the urethra, leading to mucosal irritation and pain during micturition.

Choice B rationale

A tense (firm) uterus is a key physical sign of polyhydramnios, reflecting the excessive accumulation of amniotic fluid. This fluid volume stretches the myometrium, leading to palpable firmness or rigidity upon abdominal assessment. Normal amniotic fluid volume in the third trimester is approximately 800-1000 mL, while polyhydramnios involves a volume typically exceeding 2000 mL or an Amniotic Fluid Index (AFI) greater than 24-25 cm.

Choice C rationale

Difficulty auscultating fetal heart sounds occurs because the excessive amniotic fluid acts as a buffer or sound barrier, significantly dampening the transmission of the fetal heart sounds to the mother's abdomen. The fluid-filled space between the fetal chest wall and the uterine wall scatters the sound waves, making the detection of the fetal heart rate via external Doppler or stethoscope challenging.

Choice D rationale

Sudden weight loss is not characteristic of polyhydramnios; in fact, the opposite is expected. The massive volume increase from the excess amniotic fluid, coupled with the enlarged fetus and placenta, typically results in a rapid or excessive maternal weight gain, far exceeding the normal gestational weight gain rate for the specific trimester.

Choice E rationale

Maternal shortness of breath (dyspnea) is a common symptom of severe polyhydramnios. The dramatically enlarged uterus pushes the diaphragm cephalad (upward), mechanically restricting the downward excursion of the diaphragm during inspiration, thereby reducing the functional lung capacity and making breathing more difficult, especially when the client is supine.

Choice F rationale

A uterus larger than expected for gestational week (LGA), also termed fundal height greater than dates, is a primary clinical finding of polyhydramnios. The excessive fluid distends the uterus significantly more than a normal pregnancy would, causing the measured fundal height to exceed the expected measurement (typically ≥ 3 cm difference) based on the last menstrual period and standard growth charts.

Choice A rationale

Placing a rolled towel under the client's knees is generally discouraged because it can promote venous stasis in the lower extremities by compressing the popliteal vein, thereby increasing the risk of developing a deep vein thrombosis (DVT). While comfort measures are important, this specific action is not a critical immediate action necessary for safety or to advance care upon admission to the labor unit.

Choice B rationale

The healthcare provider must be notified of the client's admission and status, but this is not the most critical immediate action for the nurse. The immediate priority upon admission is to complete the initial assessment, which includes establishing the fetal heart rate (FHR) baseline (which is currently being monitored) and assessing the stage of labor through a sterile vaginal exam, then notifying the provider with complete findings.

Choice C rationale

Administering supplemental oxygen via a non-rebreather mask (NRB) is indicated for signs of maternal hypoxemia (low oxygen saturation) or for fetal distress. Although the client has an increased respiratory and cardiac rate, her lungs are clear, and she is alert, suggesting anxiety or labor pain is the likely cause. Oxygen is not immediately required without evidence of true hypoxemia.

Choice D rationale

Performing a sterile vaginal exam (SVE) to assess cervical dilation and effacement is a critical, immediate action upon admission to the labor unit to determine the stage of labor. This information is essential for triage, ongoing management, and planning. It provides the baseline data needed to compare against subsequent exams and to communicate the client's status effectively to the healthcare provider.