A primigravida at 41 weeks gestation is admitted for labor induction due to post-term pregnancy. The cervix is 1 cm dilated, 50% effaced, and the fetal head is at -2 station. Which nursing intervention should be the priority before beginning oxytocin administration?
1Insert an intrauterine pressure catheter to monitor contraction strength
2Apply cervical ripening agent before oxytocin induction✓ 정답
3Rupture membranes artificially to enhance labor progress
4Begin oxytocin infusion at the lowest recommended dose
해설
With an unfavorable cervix (Bishop score 4), cervical ripening is prioritized before oxytocin to improve induction success and reduce cesarean risk. Other options are interventions for later stages or after cervical ripening.
Core Nursing ExplanationKey Concept Analysis: This question assesses the critical nursing knowledge of managing Labor induction in a Post-term pregnancy. The core principle is that successful induction requires a cervix that is favorable or "ripe" (soft, thin, dilated). The patient's cervical status (1 cm, 50% effaced, -2 station) indicates an Unfavorable cervix (low Bishop score). Administering oxytocin to an unripe cervix is often ineffective and increases the risk of prolonged labor, uterine hyperstimulation, and cesarean delivery. Therefore, the priority is to prepare the cervix first.
Answer Rationale: Key Point! The priority before beginning oxytocin is to apply a Cervical ripening agent. This intervention directly addresses the primary barrier to successful induction—the unfavorable cervix. Agents like prostaglandin E2 (dinoprostone) or a mechanical dilator (Foley catheter) soften, thin, and begin to dilate the cervix, creating conditions where oxytocin can work effectively to stimulate contractions. This sequential approach is standard, evidence-based practice to improve outcomes.
Distractor Analysis:
Watch out for confusion! Option ①: Inserting an Intrauterine pressure catheter (IUPC) is for monitoring contraction strength during active oxytocin administration, not before starting it. It's a later-step intervention for titrating the dose.
Option ③: Artificial rupture of membranes (AROM) is typically performed after the cervix has begun to dilate and the fetal head is well-applied, often during active labor to augment progress. Doing it with a high, unripe cervix increases the risk of cord prolapse and infection without improving the success of induction at this early stage.
Option ④: Beginning oxytocin at the lowest dose is the correct protocol once the cervix is favorable. However, starting it on an unripe cervix (as described) is not the priority intervention and is likely to fail. The question asks for the priority before beginning oxytocin.
Related Concepts: This integrates knowledge of the Bishop score (a pre-induction cervical assessment tool), indications for post-term pregnancy (≥42 weeks), and the stepwise protocol for labor induction. Understanding the "why" prevents jumping to interventions that are correct in other contexts but not the priority here.
Concept Summary
Concept
Description
Relevance to This Case
Post-term Pregnancy
Gestation ≥ 42 weeks. Increased risks include macrosomia, oligohydramnios, and placental insufficiency.
Before induction. To prepare an unfavorable cervix for labor.
Monitor for uterine hyperstimulation and fetal distress. Patient must be on continuous fetal monitoring.
Oxytocin Infusion
During induction. To initiate and regulate uterine contractions after cervix is ripe.
Start low, go slow. Titrate based on contraction pattern (every 30-60 min). Monitor for tachysystole.
Amniotomy (AROM)
During active labor. To augment labor by releasing prostaglandins and allowing direct fetal head pressure on cervix.
Assess fetal heart rate (FHR) before and immediately after. Document color, odor, and amount of fluid.
Anatomy, Physiology & Pharmacology Points
Physiology: Prostaglandins (used for ripening) work by breaking down collagen fibers in the cervix, making it soft and stretchable. Oxytocin works by increasing intracellular calcium in myometrial cells, triggering contractions.
Pharmacology: Cervical ripening agents (e.g., dinoprostone) have a Key Point!contraindication: they should not be used if the patient has a history of prior cesarean section or uterine surgery due to the risk of uterine rupture.
Assessment: Station "-2" means the fetal presenting part (head) is 2 cm above the maternal ischial spines. A high station with an unripe cervix makes successful induction with oxytocin alone unlikely.
Memory Tips
Acronym: RIPE before you DRIP. The cervix must be Ripe before you start the oxytocin DRIP.
Bishop Score Mnemonic: DESS-P (Dilation, Effacement, Station, Softness, Position). A score of ≤6 means you need to help the cervix "get in shape" first.
High-Frequency NCLEX Topics
The NCLEX frequently tests the sequence and priority of interventions in obstetric care. You must know that cervical assessment (Bishop score) dictates the first step in induction. Questions often present a patient with an unfavorable cervix and ask for the "priority," "first," or "initial" action.
Watch Out for Question Variations!
Instead of asking for the priority intervention, the question might ask: "The nurse anticipates the physician will order which medication first?" (Answer: Cervical ripening agent).
The scenario could change to a patient with a favorable cervix (e.g., 3 cm, 80%, 0 station). Then the priority would be to begin oxytocin infusion (Option 4).
It could be a safety question: "Which finding requires the nurse to hold the cervical ripening agent?" (Answer: History of classical cesarean section).
Nursing Clinical Practice GuideClinical Scenario: You are the nurse admitting Maya, a 28-year-old primigravida at 41 weeks and 2 days. She is anxious about being overdue. Your vaginal exam confirms the cervix is long, posterior, firm, 1 cm dilated, 50% effaced, and the head is high at -2 station. The fetal heart rate (FHR) tracing is Category I (reassuring).
Nursing Intervention Strategy:
Assessment & Education: Explain the induction process to Maya and her partner. Validate her feelings. Calculate the Bishop score (approximately 4) and document it clearly. Ensure a baseline FHR and contraction monitoring is established and is reassuring.
Priority Action: Anticipate and prepare for the administration of a cervical ripening agent per protocol (e.g., dinoprostone vaginal insert). This is your priority before any oxytocin is considered.
During Ripening: Continue continuous electronic fetal monitoring (EFM). Monitor for signs of Uterine hyperstimulation (more than 5 contractions in 10 minutes) and nonreassuring FHR changes. Assess for onset of labor pains.
Post-Ripening/Pre-Oxytocin: After the designated time (e.g., 12-24 hours), reassess the cervix. If it is favorable (e.g., ≥3 cm, ≥80% effaced), then you can proceed with the oxytocin protocol.
Patient Safety and Precautions:
Absolute Contraindication for Prostaglandins: Prior uterine scar (e.g., classical C-section, myomectomy), known hypersensitivity, or unexplained vaginal bleeding. Key Point! Always verify obstetric history!
Monitoring: Uterine hyperstimulation is the major risk. Have terbutaline (a tocolytic) readily available per protocol to relax the uterus if needed.
Patient Positioning: Keep the patient on bedrest for the duration specified after prostaglandin insertion (often 30-60 minutes) to prevent expulsion.
Verify order, patient identity, and absence of contraindications.
Place patient in dorsal recumbent position.
Insert the vaginal insert into the posterior fornix of the vagina.
Keep patient supine for 30 minutes after insertion.
Initiate continuous EFM. Monitor uterine activity and FHR per protocol (e.g., every 30 min).
The insert is usually removed after 12 hours or at the onset of active labor.
For Oxytocin (Pitocin) Infusion (to be started AFTER ripening):
Use an infusion pump. Standard starting dose is often 0.5-1 mU/min.
Increase by 1-2 mU/min every 30-60 minutes until adequate labor pattern is established (3 contractions per 10 minutes, each lasting 40-60 seconds).
Key Point! The goal is to achieve a physiologic labor pattern, not a maximum dose.
Discontinue oxytocin and notify the provider immediately for tachysystole with FHR changes, or if hyperstimulation occurs.
A Word from Your Senior Nurse
Labor induction is a common but nuanced procedure. Remember, you are the one at the bedside watching the monitor and assessing the patient. Your understanding of "why we ripen first" makes you an advocate for safe, effective care. Jumping straight to Pitocin on a closed, high cervix is like trying to push a car in park—it creates a lot of strain with little movement. Your knowledge ensures the process starts on the right foot, reducing stress for the patient and the uterus! On the NCLEX, they love to test if you know the logical, safe sequence of care. Think step-by-step, just like you would at the bedside.