# A nurse is assessing a pregnant client at 28 weeks gestation in the outpatient clinic who presents with fever, abdominal tenderness, and foul-smelling amniotic fluid. Her membranes ruptured 18 hours ago. Which assessment finding would be most indicative of chorioamnionitis?

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> subject: Maternal Newborn Health

## 문제

A nurse is assessing a pregnant client at 28 weeks gestation in the outpatient clinic who presents with fever, abdominal tenderness, and foul-smelling amniotic fluid. Her membranes ruptured 18 hours ago. Which assessment finding would be most indicative of chorioamnionitis?

A 28-year-old gravida 2, para 1 client at 36 weeks gestation presents to the labor and delivery unit with complaints of fever and abdominal pain. Her membranes ruptured 18 hours ago.

## 보기

1. Maternal temperature of 101.2°F (38.4°C) with maternal tachycardia of 110 bpm **✔ 정답**
2. Decreased fetal movement with fetal bradycardia of 100 bpm
3. Elevated blood pressure of 150/90 mmHg with proteinuria
4. Vaginal bleeding with uterine contractions every 3 minutes

**정답: 1**

## 해설

Maternal fever with tachycardia is the most classic indicator of chorioamnionitis, reflecting systemic inflammatory response. Other findings (fetal bradycardia, hypertension/proteinuria, vaginal bleeding/contractions) are less specific or indicate other conditions like fetal distress or preeclampsia.

## 심화 해설

Understanding Chorioamnionitis

The clinical scenario describes a client with prolonged rupture of membranes (PROM) presenting with fever, abdominal tenderness, and foul-smelling amniotic fluid. These are classic signs of intra-amniotic infection, or chorioamnionitis. The condition results from ascending bacteria from the lower genital tract into the uterine cavity, facilitated by the loss of the protective barrier of the membranes. The diagnosis is primarily clinical, based on maternal fever and at least two other findings such as maternal or fetal tachycardia, uterine tenderness, or purulent amniotic fluid . The question asks which assessment finding is most indicative of this condition, requiring you to differentiate primary infectious signs from secondary fetal responses or unrelated obstetric complications.

Analysis of the Correct Answer

The correct answer is Option 1: Maternal temperature of 101.2°F (38.4°C) with maternal tachycardia of 110 bpm. This combination is the hallmark of the maternal systemic inflammatory response to infection. A maternal fever of 100.4°F (38.0°C) or higher is the single most critical diagnostic criterion for clinical chorioamnionitis . The concurrent maternal tachycardia reflects the body's compensatory mechanism to meet increased metabolic demands and vasodilation caused by the infection and fever. Research on predictors of severe chorioamnionitis confirms that clinical signs like intrapartum fever are the primary triggers for diagnosis and are independently associated with more severe histological inflammation of the placenta and fetal membranes [1]. This maternal presentation directly reflects the pathophysiology of the infection itself, making it the most indicative finding.

Analysis of Incorrect Options

Option 2: Decreased fetal movement with fetal bradycardia of 100 bpm represents a fetal response to a hostile intrauterine environment, not the primary diagnostic indicator. While fetal tachycardia is a recognized clinical criterion for chorioamnionitis due to fetal inflammatory response syndrome (FIRS), fetal bradycardia is a late, ominous sign of severe fetal distress, hypoxia, or acidemia. It indicates decompensation and is a consequence of, rather than a primary indicator for, the initial diagnosis. Studies developing prediction models for chorioamnionitis in PROM patients focus on antepartum maternal clinical and laboratory indicators, not late fetal heart rate decelerations, to establish an early diagnosis [2, 4].

Option 3: Elevated blood pressure of 150/90 mmHg with proteinuria is the classic presentation of preeclampsia, a hypertensive disorder of pregnancy. While preeclampsia can coexist with other conditions, its pathophysiology of endothelial dysfunction and vasospasm is distinct from the infectious and inflammatory process of chorioamnionitis. This finding would shift the clinical priority toward managing a hypertensive crisis and assessing for end-organ damage, not primarily diagnosing an intra-amniotic infection.

Option 4: Vaginal bleeding with uterine contractions every 3 minutes in a client at 28 weeks gestation is most concerning for placental abruption or preterm labor with a possible bleeding complication. Although chorioamnionitis can trigger preterm labor, the presence of vaginal bleeding is not a diagnostic criterion for the infection itself. The primary concern with this assessment would be maternal and fetal hemodynamic stability related to blood loss and the potential for coagulopathy, diverting the diagnostic focus away from a primary infectious etiology. The foundational diagnostic studies for chorioamnionitis rely on clinical signs of inflammation, such as fever and uterine tenderness, and laboratory markers like serum amyloid A, not the presence of bleeding .References (research sources)

- [1]Predictors of Severe Histological Chorioamnionitis and Associated Neonatal Outcomes in Term Intrapartum Clinical Chorioamnionitis: A Retrospective Cohort Study.Research articleBosco M, Garzon S, Simonetto C, Cattin B, Erbogasto EI, Ficial B, Milocchi C, Raffaelli R, Uccella L, Franchi M, Uccella S. (2026) · DOI: 10.3390/medicina62050937

## 임상 시나리오

Clinical Diagnosis of Chorioamnionitis

Key Assessment Findings and Diagnostic Criteria

Primary Diagnostic Criterion

The cornerstone of clinical diagnosis is **maternal fever**, defined as a single temperature of **≥100.4°F (38.0°C)** or two temperatures of 99.6°F (37.6°C) to 100.3°F (38.0°C) measured 30 minutes apart. This finding alone should trigger immediate evaluation for intra-amniotic infection in the setting of ruptured membranes.

Supportive Clinical Signs (Require ≥2 for Diagnosis)

- **Maternal tachycardia** (>100 bpm) reflecting systemic inflammatory response.

- **Fetal tachycardia** (>160 bpm) as an early fetal response to infection.

- **Uterine fundal tenderness** on palpation, distinct from normal labor discomfort.

- **Purulent or foul-smelling amniotic fluid** noted on speculum examination.

- **Maternal leukocytosis** (WBC >15,000 cells/mm³) in the absence of corticosteroid administration.

Nursing Assessment Priorities

In a client with prolonged rupture of membranes (>18 hours), perform frequent vital sign monitoring every 2-4 hours. Assess for the triad of maternal fever, uterine tenderness, and foul-smelling discharge. Document fetal heart rate patterns, as fetal tachycardia often precedes maternal fever. Prompt recognition and reporting of these findings is critical to initiate intrapartum antibiotic therapy and expedite delivery to prevent maternal and neonatal sepsis.

Differential Considerations

Fever in labor may also arise from epidural anesthesia, dehydration, or extrauterine infections (e.g., UTI, respiratory infection). However, the combination of fever with ruptured membranes and uterine tenderness strongly favors chorioamnionitis over these alternative etiologies. Preeclampsia with severe features presents with hypertension and proteinuria, not fever. Placental abruption presents with vaginal bleeding and abdominal pain but typically lacks infectious signs.

## 핵심 개념

- **Chorioamnionitis** — An acute inflammation of the fetal membranes (chorion and amnion) typically caused by ascending bacterial infection, diagnosed clinically by maternal fever plus at least two other signs such as maternal or fetal tachycardia, uterine tenderness, or purulent amniotic fluid.
- **Prolonged Rupture of Membranes (PROM)** — Rupture of the amniotic sac before the onset of labor; when lasting more than 18 hours, it significantly increases the risk of ascending infection and chorioamnionitis.
- **Maternal Tachycardia** — A maternal heart rate exceeding 100 beats per minute, often a compensatory response to fever and systemic vasodilation during intra-amniotic infection.

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