The most common cause of decreased variability in the FHR is:

Choice A rationale

Tub bathing is generally considered safe throughout pregnancy, including late gestation, as long as the woman is comfortable getting in and out of the tub and the water is not excessively hot. However, tub bathing should be avoided after the rupture of membranes (amniotic sac) to minimize the risk of ascending bacterial infection into the uterus.

Choice B rationale

Proper perineal hygiene involves wiping from front to back (urethra to anus). This technique prevents the transfer of fecal bacteria, such as Escherichia coli, from the anal area to the vaginal or urethral openings, significantly reducing the risk of developing a urinary tract or vaginal infection.

Choice C rationale

Cleansing the nipples during pregnancy is typically done with plain water and is part of the regular daily shower or bath routine. The use of specially treated soaps or harsh chemicals on the nipples should be avoided as they can remove protective oils and increase the dryness or irritation of the skin.

Choice D rationale

While bath time can be relaxing, expectant mothers should be advised to avoid using bubble baths, bath oils, or heavily scented soaps. These substances can sometimes irritate the sensitive vulvar and vaginal tissues, potentially leading to inflammation, itching, or even predisposing to a vaginal infection.

Choice A rationale

Determining when the last meal was eaten is important for assessing aspiration risk, especially if an emergency cesarean section is needed, which is a key safety measure. However, this is a secondary concern to establishing the fetal status. Fetal well-being is the highest priority upon admission for a woman in labor, as indicated by monitoring the fetal heart rate.

Choice B rationale

Ascertaining whether the membranes have ruptured is necessary because rupture of membranes increases the risk of infection (chorioamnionitis) and can be associated with cord prolapse. While critical for infection control and assessing the risk of cord prolapse, this action does not take priority over the immediate evaluation of fetal status and oxygenation through heart auscultation.

Choice C rationale

Obtaining a comprehensive obstetric history (parity, previous birth experiences, complications, etc.) is essential for planning care and identifying risk factors. This information helps the nurse and provider anticipate potential complications during labor and delivery. However, it is an administrative and data-gathering task that can be performed after the immediate assessment of the maternal and fetal status.

Choice D rationale

Auscultating the fetal heart is the highest priority upon admission of a laboring patient. This action immediately assesses the current fetal status, specifically the heart rate and its pattern, which are the most critical indicators of fetal oxygenation and well-being. Any signs of fetal distress, such as a nonreassuring heart rate pattern, require immediate intervention and supersede all other admission tasks.