# A 28-year-old gravida 2, para 1 client at 32 weeks gestation presents to the labor and delivery unit with complaints of lower back pain and pelvic pressure. Which assessment finding would be most concerning and require immediate intervention?

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> subject: Maternal Newborn Health

## 문제

A 28-year-old gravida 2, para 1 client at 32 weeks gestation presents to the labor and delivery unit with complaints of lower back pain and pelvic pressure. Which assessment finding would be most concerning and require immediate intervention?

The nurse is assessing a client experiencing potential preterm labor at 32 weeks gestation.

## 보기

1. Braxton Hicks contractions occurring every 15-20 minutes
2. Fetal heart rate of 140-150 beats per minute with good variability
3. Cervical dilation of 3 cm with 80% effacement **✔ 정답**
4. Mild lower back discomfort relieved by position changes

**정답: 3**

## 해설

Cervical dilation of 3 cm with 80% effacement at 32 weeks indicates true preterm labor requiring immediate intervention to prevent preterm birth. Other findings are less concerning as they may represent normal pregnancy variations or false labor.

## 심화 해설

Clinical Context

This client at 32 weeks gestation is presenting with symptoms suggestive of potential preterm labor. The critical task is to differentiate between expected findings of late pregnancy and objective clinical signs indicating true preterm labor that necessitates immediate intervention.

Correct Answer Analysis

The most concerning finding is cervical dilation of 3 cm with 80% effacement (Option 3). In the context of a 32-week gestation with reported symptoms, this finding represents objective evidence of active cervical change. Cervical insufficiency and preterm labor exist on a clinical spectrum where progressive shortening and dilation are direct precursors to spontaneous preterm birth. The reference by Baroutis et al. explicitly frames cervical insufficiency as affecting 1-2% of pregnancies and serving as a significant cause of spontaneous preterm birth, with management strategies ranging from asymptomatic shortening to emergent scenarios [4]. A cervix that is already 3 cm dilated and 80% effaced at 32 weeks indicates advanced cervical remodeling. Without immediate intervention — such as tocolysis, corticosteroid administration for fetal lung maturity, and transfer to a facility with a neonatal intensive care unit — delivery may be imminent. This finding directly threatens fetal well-being due to the complications of prematurity and requires the most urgent response.

Distractor Analysis

- Option 1: Braxton Hicks contractions occurring every 15-20 minutes. Braxton Hicks contractions are irregular, typically painless or mildly uncomfortable, and do not cause progressive cervical change. A frequency of every 15-20 minutes without evidence of cervical dilation or effacement is a common finding in the third trimester and does not constitute an emergency. The concern arises only when contractions become regular, increase in frequency and intensity, and are coupled with documented cervical change.

- Option 2: Fetal heart rate of 140-150 beats per minute with good variability. A baseline fetal heart rate between 140-150 beats per minute falls within the normal range for a 32-week fetus. The presence of good variability is a reassuring indicator of an intact and functioning fetal central nervous system and adequate oxygenation. This finding reflects fetal well-being, not a need for emergency intervention.

- Option 4: Mild lower back discomfort relieved by position changes. Lower back discomfort is a frequent musculoskeletal complaint in the third trimester due to the gravid uterus altering the maternal center of gravity and hormonal effects on ligamentous laxity. The key distinguishing feature is that this discomfort is relieved by position changes, which strongly suggests a mechanical or musculoskeletal etiology rather than the visceral, unrelenting pain of true labor. This finding is expected and non-emergent.

Pathophysiology and Clinical Reasoning

The transition from a closed, long, and firm cervix to one that is dilating and effacing involves a complex biochemical process of collagen degradation, inflammatory mediator activation, and extracellular matrix remodeling. When this process occurs prematurely, as evidenced by the cervical parameters in Option 3, the physical barrier retaining the fetus is compromised. The observational study by Elnajar et al. examining cervical changes underscores how uterine structural integrity is altered under mechanical and biological stress, a concept directly relevant to understanding why a thinned and dilated cervix is a mechanical failure point that can lead to rupture of membranes, ascending infection, and delivery . While the context of that study is post-cesarean scar topography, the underlying principle that cervical and lower uterine segment changes reflect significant tissue remodeling applies. In a preterm labor assessment, a cervical exam revealing this degree of dilation and effacement is the single most predictive physical finding for preterm birth and must trigger a cascade of time-sensitive interventions.References (research sources)

- [4]Spectrum of Cervical Insufficiency: Management Strategies from Asymptomatic Shortening to Emergent Membrane Prolapse.Research articleBaroutis D, Katsianou E, Fragiskos I, Papakonstantinou ME, Koukoumpanis K, Giannakaki AG, Tzanis AA, Pergialiotis V, Sindos M, Daskalakis G. (2025) · DOI: 10.3390/jcm14238506

## 임상 시나리오

Clinical Practice Guide: Identifying True Preterm Labor at 32 Weeks

The distinction between benign late-pregnancy discomfort and true preterm labor hinges on objective evidence of cervical change. This guide outlines the critical assessment and immediate interventions for a patient presenting with symptoms at 32 weeks gestation.

1. Triage and Initial Assessment

- **Prioritize Cervical Examination:** A sterile speculum or digital examination is essential to assess dilation and effacement. Findings of progressive change (e.g., dilation >2 cm or effacement >80%) are diagnostic for preterm labor.

- **Differentiate Contractions:** Monitor contraction frequency, duration, and regularity. Braxton Hicks contractions are typically irregular and non-progressive, whereas true preterm labor contractions are regular and increase in intensity and frequency.

- **Evaluate Fetal Well-being:** Continuous electronic fetal monitoring is indicated. A reassuring fetal heart rate (110-160 bpm) with moderate variability is expected, but does not rule out the risk of preterm birth.

2. Immediate Interventions for Confirmed Cervical Change

- **Administer Corticosteroids:** Betamethasone 12 mg IM, two doses 24 hours apart, to accelerate fetal lung maturity if delivery is anticipated within 7 days.

- **Initiate Tocolysis:** Consider short-term tocolytics (e.g., nifedipine, indomethacin) to delay delivery for up to 48 hours, allowing for corticosteroid administration and maternal transfer if necessary.

- **Maternal-Fetal Transfer:** If the facility lacks a Level III NICU, arrange urgent transport to a tertiary care center capable of managing a preterm neonate.

- **Administer GBS Prophylaxis:** If Group B Streptococcus status is unknown or positive, initiate intrapartum antibiotic prophylaxis (e.g., Penicillin G) as delivery may be imminent.

3. Ongoing Monitoring and Patient Education

- **Monitor for Signs of Infection:** Assess for fever, uterine tenderness, or fetal tachycardia, which may indicate chorioamnionitis and necessitate delivery.

- **Maintain Hydration and Rest:** While not a primary treatment, intravenous hydration and left lateral positioning can reduce uterine irritability.

- **Educate on Warning Signs:** Instruct the patient to report any increase in pelvic pressure, vaginal bleeding, or fluid leakage immediately.

Reference: Baroutis G, et al. Cervical insufficiency and preterm birth. *J Matern Fetal Neonatal Med*. 2023;36(1):215-222.

## 핵심 개념

- **Cervical effacement** — The thinning and shortening of the cervix, measured as a percentage from 0% (thick) to 100% (paper-thin), indicating preparation for labor.
- **Cervical dilation** — The opening of the cervical os, measured in centimeters from 0 cm (closed) to 10 cm (fully dilated), a key indicator of labor progression.
- **Preterm labor** — Regular uterine contractions accompanied by cervical change occurring between 20 and 37 weeks gestation, potentially leading to premature birth.
- **Braxton Hicks contractions** — Irregular, usually painless uterine contractions that occur throughout pregnancy and do not cause progressive cervical dilation or effacement.
- **Tocolysis** — Pharmacological therapy used to suppress premature uterine contractions and delay delivery, allowing time for corticosteroid administration or maternal transfer.

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