A nurse is assessing a laboring client at 38 weeks gestation. Which assessment finding would be the most concerning indicator of chorioamnionitis?
1Contractions occurring every 2-3 minutes lasting 60-90 seconds
2Maternal temperature of 101.2°F (38.4°C) with fetal tachycardia of 170 bpm✓ 정답
3Amniotic fluid with light meconium staining
4Cervical dilation progressing from 6 cm to 7 cm in 2 hours
해설
Maternal fever with fetal tachycardia is the most concerning sign of chorioamnionitis, especially with prolonged rupture of membranes. Other options are normal labor findings or less specific indicators.
The question asks you to identify the most concerning indicator of chorioamnionitis during a labor assessment. Chorioamnionitis, also referred to as intra-amniotic infection, is an acute inflammation of the fetal membranes and amniotic fluid, typically caused by an ascending bacterial infection. Recognizing its clinical hallmarks is critical for timely intervention to prevent severe maternal and neonatal complications. The standard clinical definition, as reflected in the provided studies, is based on the presence of maternal fever and at least one other clinical sign, such as maternal or fetal tachycardia, fundal tenderness, or purulent amniotic fluid [1, 4].
Analyzing the Answer Choices
Let's examine each option to understand why option 2 is the correct and most concerning finding.
Option 1: Contractions occurring every 2-3 minutes lasting 60-90 seconds
This describes a normal, active labor contraction pattern for a term gestation. While a tachysystole pattern (more than 5 contractions in 10 minutes) can be associated with fetal distress, this specific finding alone is an expected physiological event during labor and is not a diagnostic criterion for chorioamnionitis.
Option 2: Maternal temperature of 101.2°F (38.4°C) with fetal tachycardia of 170 bpm
This is the correct answer. This finding directly meets the clinical criteria for diagnosing suspected chorioamnionitis. The research provided defines clinical chorioamnionitis as an intrapartum fever, specifically a temperature of 38.0°C or greater, accompanied by one or more additional signs [1, 4]. Here, the maternal temperature is 38.4°C, which qualifies as a significant intrapartum fever. The fetal heart rate of 170 bpm is a clear fetal tachycardia, which is a classic fetal response to infection and a key secondary sign. The combination of maternal fever and fetal tachycardia is highly specific for an intrauterine infectious process and signals an urgent need for intervention, such as intravenous antibiotic administration, to mitigate adverse outcomes .
Option 3: Amniotic fluid with light meconium staining
Meconium-stained amniotic fluid can be a sign of fetal distress or a normal physiological event in a post-term fetus. At 38 weeks, it warrants close monitoring but is not a primary diagnostic indicator of chorioamnionitis. The infectious process in chorioamnionitis is more directly associated with purulent or foul-smelling amniotic fluid, not meconium.
Option 4: Cervical dilation progressing from 6 cm to 7 cm in 2 hours
This represents a cervical change of 1 cm in 2 hours, which is slower than the expected rate of dilation in the active phase (typically 1.2 cm/hr for a primipara and 1.5 cm/hr for a multipara). While this could indicate a labor dystocia, which is a risk factor for chorioamnionitis, it is not a diagnostic finding of the infection itself. It is a risk factor, not a clinical indicator.
Clinical Reasoning and Implications for Care
The clinical diagnosis of chorioamnionitis is a key trigger for action. The primary concern is the potential for severe sequelae. The research highlights that intrapartum clinical chorioamnionitis at term is a complication associated with adverse maternal and neonatal outcomes, including a higher likelihood of NICU admission for the neonate [1]. Furthermore, the presence of a significant intrapartum fever, particularly when categorized as ≥39.0°C, has been studied for its association with other birth injuries, such as obstetric anal sphincter injuries (OASIS), underscoring the systemic impact of the inflammatory process [4]. Once suspected, prompt administration of appropriate intravenous antibiotics is the cornerstone of management to reduce the infectious burden and improve outcomes for both the mother and the fetus . The combination of maternal fever and fetal tachycardia is the most direct and urgent signal that this infectious process is underway and requires immediate interprofessional collaboration and intervention.
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
[4]
Associations of intrapartum fever and clinical chorioamnionitis with obstetric anal sphincter injuries in term vaginal deliveries.Research articleMikhail SM, Abu Shqara R, Ganem N, Aiob A, Nakhleh Francis Y, Frank Wolf M, Lowenstein L. (2026) · DOI: 10.1002/ijgo.71183
Clinical Guide: Chorioamnionitis Assessment
The diagnosis of clinical chorioamnionitis is based on the presence of maternal fever (temperature ≥100.4°F or 38.0°C) and at least one other clinical sign. The most common secondary signs include maternal tachycardia (>100 bpm), fetal tachycardia (>160 bpm), fundal tenderness, and purulent or foul-smelling amniotic fluid.
Key Nursing Actions
Notify the provider immediately if maternal fever and fetal tachycardia are present, as this is a medical emergency requiring prompt antibiotic therapy.
Administer broad-spectrum antibiotics (typically Ampicillin and Gentamicin) as prescribed to reduce maternal and neonatal morbidity.
Monitor maternal vital signs hourly, including temperature and heart rate, to track the progression of infection.
Continuously monitor fetal heart rate for signs of tachycardia, decreased variability, or late decelerations indicating fetal compromise.
Prepare for possible expedited delivery, as delivery is the definitive treatment for chorioamnionitis regardless of gestational age.
Neonatal Considerations
Infants born to mothers with chorioamnionitis are at high risk for early-onset neonatal sepsis. The neonatal team should be present at delivery, and the newborn will require close observation, blood cultures, and potentially empiric antibiotic therapy.
Chorioamnionitis — Acute inflammation of the fetal membranes and amniotic fluid, typically caused by an ascending bacterial infection.
Fetal Tachycardia — A fetal heart rate greater than 160 bpm, which is a clinical sign of infection or distress.
Intra-amniotic Infection — Microbial invasion of the amniotic cavity leading to inflammation of the placenta and fetal membranes.