Uteroplacental insufficiency can be the result of maternal hypotension.

Understanding that maternal hypotension is a potential side effect of regional anesthesia and analgesia, what nursing interventions could you use to increase placental perfusion and/or raise the client's blood pressure? Choose all that apply.

Choice A rationale

Changing the woman's position, specifically to the lateral side, is the priority nursing intervention for late decelerations. This maneuver can increase uteroplacental perfusion by relieving possible maternal supine hypotension or improving blood flow to the placenta, thereby increasing oxygen delivery to the fetus and resolving the decelerations.

Choice B rationale

Amnioinfusion is a procedure to infuse normal saline into the uterine cavity via an intrauterine pressure catheter. It is primarily indicated for recurrent variable decelerations, which are typically caused by umbilical cord compression, not for late decelerations associated with uteroplacental insufficiency.

Choice C rationale

Inserting a fetal scalp electrode provides a more accurate, internal measure of the FHR. While it may be used if external monitoring is inadequate, it is not the first priority for addressing the underlying cause of late decelerations, which is usually uteroplacental insufficiency.

Choice D rationale

Notifying the care provider is necessary after performing initial corrective measures and if the late decelerations persist or worsen. The nurse's first independent action should be to attempt to resolve the issue by optimizing maternal-fetal oxygen exchange through a position change.

Choice A rationale

Neural tube defects, such as spina bifida or anencephaly, occur during primary neurulation, which is a process primarily completed in the very early embryonic period, specifically between 3 and 4 weeks of gestation. By 16 weeks, the neural tube is closed and this feature is past its most sensitive period for teratogenesis.

Choice B rationale

The most critical period for the development of the external ears is during the embryonic period, weeks 4 through 9 of gestation. While development continues, the major structural formation is complete before 16 weeks, making it less susceptible to major structural defects at this later gestational age.

Choice C rationale

The palate shelves fuse at approximately 10 to 12 weeks gestation, but the full consolidation and final development of the hard and soft palate structures continues. This structure remains sensitive to disruption and functional abnormalities, such as cleft palate, well into the late first and early second trimesters, around 16 weeks.

Choice D rationale

Major structural development of the heart, including septation and formation of the great vessels, is most sensitive to teratogens between weeks 3 and 8 of gestation. By 16 weeks, the heart structure is largely complete, and its vulnerability shifts from structural defects to primarily growth restriction or functional issues.