A pregnant client presents to the prenatal clinic with flu-like symptoms. Laboratory results reveal positive IgM antibodies for cytomegalovirus (CMV). What is the most important assessment the nurse should prioritize for this client?
A 25-year-old pregnant woman at 32 weeks gestation arrives at the prenatal clinic reporting persistent headache, photophobia, and neck stiffness for the past week. She mentions exposure to a family member with meningitis. Laboratory tests show positive IgM antibodies for cytomegalovirus (CMV), indicating a recent primary infection. The client appears anxious and asks about the implications for her pregnancy.
1Assess for signs of preterm labor contractions
2Monitor maternal blood pressure and proteinuria
3Evaluate fetal growth and development through ultrasound✓ 정답
4Check for cervical dilation and effacement
해설
Primary CMV infection during pregnancy risks fetal neurological complications and growth restriction. Ultrasound assessment is prioritized to evaluate fetal well-being. Other options focus on maternal conditions less directly linked to CMV risks.
The client’s presentation includes persistent headache, photophobia, and neck stiffness following exposure to meningitis, combined with laboratory-confirmed primary cytomegalovirus (CMV) infection (positive IgM). While the neurological symptoms raise immediate concern for meningitis, the question specifically asks for the priority assessment related to the confirmed CMV infection in the context of pregnancy. The core of this question tests the nurse's ability to prioritize care based on the most significant risk to the fetus following a primary maternal CMV infection.
Why Fetal Growth and Development Assessment is the Priority
The correct answer is to evaluate fetal growth and development through ultrasound. The primary concern with a primary CMV infection during pregnancy is vertical transmission to the fetus, leading to congenital cytomegalovirus (cCMV) infection. This is the most common congenital infection globally and a leading cause of preventable childhood disability [1,2]. The virus can cross the placenta, and the resulting fetal infection can directly impact organogenesis and growth, leading to a spectrum of adverse outcomes.
The rationale for prioritizing an ultrasound is directly supported by the provided evidence. A study on antenatal imaging in cCMV confirms that standardized prenatal care for women with primary CMV infection includes serial ultrasound examinations to monitor for fetal abnormalities [4]. These abnormalities are not limited to one system; they can include central nervous system (CNS) findings, such as ventriculomegaly or intracranial calcifications, which correlate with the neurodevelopmental sequelae mentioned in the literature [1]. Furthermore, CMV infection can cause fetal growth restriction, hepatosplenomegaly, and echogenic bowel, all of which are detectable via ultrasound. The ultrasound findings provide crucial prognostic information and guide further management, such as consideration for antiviral therapy or amniocentesis [4].
Analyzing the Incorrect Options
While the other assessments are important in general prenatal care, they do not directly address the primary pathophysiological threat posed by a new CMV infection.
- Option 1: Assess for signs of preterm labor contractions. While systemic maternal infection can sometimes trigger preterm labor, it is not the most direct or specific complication of CMV. The immediate and defining risk is fetal infection and its teratogenic effects, not the secondary risk of preterm birth. The studies highlight neurodevelopmental and audiological sequelae, not prematurity, as the hallmark of cCMV [1].
- Option 2: Monitor maternal blood pressure and proteinuria. This assessment is specific to screening for preeclampsia. Although the client’s headache could be a symptom of severe preeclampsia, her report of photophobia, neck stiffness, and known exposure to meningitis makes a CNS infection a more likely cause of her neurological symptoms than preeclampsia. More importantly, this assessment does not address the newly diagnosed CMV infection, which is the focus of the question.
- Option 4: Check for cervical dilation and effacement. This assessment is used to diagnose preterm labor or evaluate for cervical insufficiency. At 32 weeks gestation, this is a general assessment but is not the priority related to the specific finding of a primary CMV infection. The immediate threat is not the initiation of labor but the ongoing damage the virus can inflict on the developing fetus in utero.
Clinical Management and Nursing Implications
The detection of positive CMV IgM antibodies during pregnancy should prompt immediate referral to a maternal-fetal medicine or infectious diseases specialist [2]. The nurse’s role is to facilitate this referral and prioritize assessments that screen for fetal impact. Serial ultrasound examinations are a cornerstone of this evaluation to detect structural abnormalities and growth restriction [4]. Antenatal treatment with high-dose valaciclovir has been shown to reduce the risk of in utero transmission, particularly after a first-trimester primary infection, making early and accurate diagnosis of fetal involvement critical [2,4]. The presence or absence of sonographic findings is a key predictor of adverse neonatal outcomes, as the extent of fetal damage directly correlates with long-term prognosis [1].
References (research sources)
[1]
Maternal transmission, neonatal outcomes, and predictors of adverse effects in congenital cytomegalovirus infection.Research articleGarozzo MT, Pecorino B, Poli G, Maiolino L, Sciuto L, Scalia G, Ruggieri M, Polizzi A, Praticò AD. (2026) · DOI: 10.1016/j.pedneo.2025.08.016
[2]
Cytomegalovirus in pregnancy: prevention, maternal screening, and the role of antivirals.Research articleHui L, Holmes NE, Giles ML, Rawlinson W. (2026) · DOI: 10.18773/austprescr.2026.011
[4]
Antenatal Imaging and Neonatal Outcome in Infants with Congenital Cytomegalovirus Infection: The Effect of Valaciclovir.Research articleArcieri F, Vasta A, Sorrenti S, Volpe G, D'Ambrosio V, Di Mascio D, Natale F, Manganaro L, Liuzzi G, Corigliano MC, Bertolini S, Borza S, Camerino C, Rizzo G, Giancotti A. (2026) · DOI: 10.3390/jcm15020809
Clinical Management of Primary CMV Infection in Pregnancy
Assessment & Monitoring
Perform a detailed fetal anatomy ultrasound and serial growth scans every 2-4 weeks to detect anomalies such as microcephaly, ventriculomegaly, intracranial calcifications, echogenic bowel, and intrauterine growth restriction.
Assess amniotic fluid volume (oligohydramnios or polyhydramnios) which can be associated with fetal infection.
Consider amniocentesis after 20-21 weeks gestation and at least 6-8 weeks after maternal infection to confirm fetal transmission via CMV PCR, though this is a diagnostic, not screening, procedure.
Monitor maternal symptoms; primary CMV is often asymptomatic or presents with mild flu-like illness, but severe cases require supportive care.
Patient Education & Counseling
Explain that the risk of vertical transmission is highest with a primary maternal infection (30-40%) compared to a recurrent infection.
Counsel that among infected fetuses, 10-15% will be symptomatic at birth, with potential long-term sequelae including sensorineural hearing loss, vision impairment, and cognitive delays.
Discuss the role of maternal oral valacyclovir therapy, which may reduce the risk of vertical transmission and severity of fetal effects when given after primary infection in the first trimester.
Advise on standard hygiene practices (handwashing, avoiding sharing utensils) to prevent CMV acquisition, as no vaccine is currently available.
Interprofessional Collaboration
Refer to Maternal-Fetal Medicine (MFM) for comprehensive counseling, serial imaging, and consideration of antenatal treatment.
Coordinate with pediatrics and infectious disease specialists for planned postnatal evaluation of the neonate, including hearing screening and CMV PCR of urine or saliva within the first 3 weeks of life.
Engage social work and genetic counseling services to support the family in understanding the prognosis and making informed decisions.
Cytomegalovirus (CMV) — A common herpesvirus that can cause congenital infection when a primary maternal infection occurs during pregnancy, leading to fetal anomalies.
Congenital CMV (cCMV) — Fetal infection resulting from transplacental transmission of CMV, which is a leading cause of sensorineural hearing loss and neurodevelopmental disability.
IgM Antibody — An immunoglobulin indicating a recent or acute primary infection, as it is the first antibody produced in response to an antigen.
Vertical Transmission — The passage of an infectious pathogen from the mother to the fetus during the antenatal or intrapartum period.
Serial Ultrasound — Repeated prenatal imaging used to monitor fetal growth, amniotic fluid volume, and detect structural abnormalities indicative of congenital infection.