The nurse and student are discussing how to evaluate a client receiving Oxytocin in the third stage of labor.
What does the nurse include as the desired outcome of this medication?

Choice A rationale

Maternal uterine contractions are utilized during a Contraction Stress Test (CST) to assess fetal response to the stress of decreased placental perfusion. However, a Nonstress Test (NST) is a non-invasive procedure monitoring FHR response to fetal movement without inducing contractions. The NST is deemed reactive/non-reactive based on the FHR acceleration patterns, which are largely indicative of fetal physical activity and reserve.

Choice B rationale

Fetal gestational age is a key determinant for the criteria of a reactive NST. Before 32 weeks, an acceleration is defined as an increase of ≥ 10 bpm lasting ≥ 10 seconds. After 32 weeks, the criteria are ≥ 15 bpm lasting ≥ 15 seconds, as seen in this scenario. However, the reason for the reactive result itself is the healthy response of the FHR to fetal physical activity, indicating a healthy central nervous system.

Choice C rationale

A reactive Nonstress Test (NST) is one that meets specific criteria, indicating adequate oxygenation and a healthy central nervous system. The criteria for ≥ 32 weeks gestation is two or more FHR accelerations of ≥ 15 beats per minute above the baseline, each lasting ≥ 15 seconds, within a 20-minute period, usually associated with fetal physical activity. This demonstrates good fetal reserve.

Choice D rationale

Maternal blood pressure is monitored during the NST as part of the overall assessment, but it is not the reason for a reactive interpretation. Fetal bradycardia or decelerations may be linked to maternal hypotension (e.g., from supine positioning), but the core finding for reactivity is the transient FHR accelerations, which reflect a healthy autonomic nervous system responding to fetal physical activity.

Choice A rationale

Internal fetal monitoring, specifically using an intrauterine pressure catheter (IUPC), directly measures the intensity of the contraction in millimeters of mercury (mmHg). This provides a precise quantitative measure of the force exerted by the uterine muscle, which is crucial for assessing labor progress and the risk of uterine hyperstimulation, something external monitoring cannot accurately provide.

Choice B rationale

The IUPC measures the resting tone between contractions, which is the baseline uterine pressure when the uterus is relaxed. A normal resting tone is typically 8–12 mmHg. An elevated resting tone (hypertonus) can decrease uteroplacental blood flow and oxygen exchange, leading to fetal distress, thus requiring careful monitoring.

Choice C rationale

The client's position during contraction and labor is an external observation and does not require or necessitate the use of an internal fetal monitoring device. Fetal monitoring primarily focuses on the physiological parameters of uterine activity and the fetal heart rate, not the mother's physical positioning or movement.

Choice D rationale

An internal fetal scalp electrode (FSE) is the most accurate method for continuously monitoring the fetal heart rate during labor. It attaches directly to the fetal scalp, providing a high-fidelity, beat-to-beat recording that is not affected by maternal or fetal movement, ensuring the most precise assessment of fetal well-being.

Choice E rationale

While the IUPC primarily measures pressure, it also allows for the accurate determination of the frequency of the contraction, measured from the beginning of one contraction to the beginning of the next. This precise timing is essential for calculating the contraction pattern and assessing the adequacy of labor and potential for hyperstimulation.

Choice F rationale

The client's response to the contraction, such as their pain level or need for comfort measures, is a subjective, behavioral observation. It is part of the overall nursing assessment but is not a physiological parameter directly measured or characterized by the internal fetal monitoring devices (IUPC or FSE).