# A nurse is assessing a 1-week-old infant whose mother had a positive cytomegalovirus (CMV) titer during pregnancy. Which assessment finding would be most indicative of congenital CMV infection in this infant?

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> subject: Infectious Diseases

## 문제

A nurse is assessing a 1-week-old infant whose mother had a positive cytomegalovirus (CMV) titer during pregnancy. Which assessment finding would be most indicative of congenital CMV infection in this infant?

## 보기

1. Petechiae and hepatosplenomegaly **✔ 정답**
2. Macrocephaly and increased muscle tone
3. Cyanosis and respiratory distress
4. Jaundice and poor feeding

**정답: 1**

## 해설

Petechiae and hepatosplenomegaly are classic signs of congenital CMV infection, representing the most common and characteristic manifestations. Other options are associated with conditions like hydrocephalus (macrocephaly), respiratory disorders (cyanosis), or general neonatal issues (jaundice).

## 심화 해설

Understanding the Clinical Presentation of Congenital CMV

When assessing a newborn for congenital cytomegalovirus (cCMV) infection, it is critical to recognize the classic triad of clinical signs that define symptomatic disease at birth. The question asks for the finding *most indicative* of cCMV, which requires you to differentiate between pathognomonic clusters of signs and more nonspecific neonatal symptoms.

The correct answer is **Petechiae and hepatosplenomegaly**. This combination reflects the virus's direct impact on the reticuloendothelial system and bone marrow. CMV has a particular predilection for the hepatobiliary epithelium and megakaryocytes, leading to a predictable pattern of organ involvement. The foundational natural history study by Boppana et al. established that in a cohort of 106 neonates with symptomatic cCMV, petechiae and hepatosplenomegaly were each present in 70% or more of patients [3]. This high prevalence makes their co-occurrence a powerful clinical indicator. The underlying pathophysiology involves extramedullary hematopoiesis and direct viral cytopathic effect on the liver and spleen, causing organ enlargement, while concurrent thrombocytopenia—present in a significant majority of these infants—manifests as petechiae. This is not a random pairing but a direct consequence of the systemic viral infection.

Let's analyze why the other options are less specific or not the *most* indicative primary finding for cCMV in this context. While some components of the other choices can be seen with cCMV, they do not represent the most classic, high-yield combination for initial assessment.

- **Option 2: Macrocephaly and increased muscle tone.** This is incorrect. The classic central nervous system finding in symptomatic cCMV is microcephaly, not macrocephaly. Boppana et al. noted microcephaly in 54 of 102 (53%) of infants at birth [3]. Increased muscle tone is also not a hallmark; infants with significant neurological involvement may present with hypotonia or seizures.

- **Option 3: Cyanosis and respiratory distress.** While pneumonitis can be a manifestation of severe, disseminated cCMV, cyanosis and respiratory distress are nonspecific findings in a 1-week-old and are far more commonly associated with bacterial sepsis, congenital heart disease, or respiratory distress syndrome. They are not the primary, most indicative signs of cCMV.

- **Option 4: Jaundice and poor feeding.** This is a strong distractor because both are common in cCMV. Jaundice was noted in over 70% of patients, and it is often a conjugated hyperbilirubinemia due to viral hepatitis [3]. Poor feeding is a nonspecific sign of illness in any neonate. However, the combination of jaundice and poor feeding is a classic presentation for neonatal sepsis. While cCMV must be on the differential, the combination of **petechiae and hepatosplenomegaly** is more uniquely characteristic of the congenital infection's classic physical examination findings and has a higher specificity when considered together.

The modern context reinforces this classic presentation. A recent large-scale analysis of NICU newborns in the United States from 2010 to 2020 continues to identify clinical signs like petechiae and hepatosplenomegaly as key triggers for cCMV testing and diagnosis . The persistence of these findings as clinical markers over decades underscores their validity. Furthermore, a review in the *Journal of Midwifery & Women's Health* emphasizes that the presentation of symptomatic cCMV at birth is often a multisystem disease, with petechiae, jaundice, and hepatosplenomegaly forming the classic triad, a consequence of the virus's hematogenous dissemination to the fetus during maternal primary or non-primary infection . The long-term implications, particularly for sensorineural hearing loss (SNHL), are significant regardless of the initial symptom severity, but the presence of clinically detectable disease at birth, as indicated by findings like petechiae and hepatosplenomegaly, is a strong predictor of more severe neurodevelopmental outcomes .

References (research sources)

- [3]Symptomatic congenital cytomegalovirus infectionResearch articleSuresh B. Boppana, Robert F. Pass, William J. Britt, Sergio Stagno, Charles A. Alford (1992) · DOI: 10.1097/00006454-199202000-00007

## 임상 시나리오

Congenital CMV AssessmentIdentifying the Classic Triad in Newborns
The most indicative findings for symptomatic congenital CMV are petechiae and hepatosplenomegaly, present in over 70% of cases. This reflects viral targeting of the reticuloendothelial system and bone marrow.

Always evaluate for the full classic triad, which includes microcephaly. Other common signs are thrombocytopenia, jaundice, and sensorineural hearing loss.

CautionIsolated jaundice or poor feeding is nonspecific in neonates. Do not rule out CMV based on the absence of these findings alone, as 90% of infected infants are asymptomatic at birth but remain at risk for late-onset hearing loss.

## 핵심 개념

- **Congenital CMV Classic Triad** — The most common clinical manifestations of symptomatic cCMV at birth include petechiae, hepatosplenomegaly, and microcephaly.
- **Reticuloendothelial System** — A network of phagocytic cells in the liver, spleen, and bone marrow that CMV targets, leading to organ enlargement and hematologic abnormalities.
- **Petechiae** — Pinpoint, non-blanching red or purple spots on the skin caused by thrombocytopenia, a common finding in congenital CMV due to bone marrow suppression.
- **Hepatosplenomegaly** — Enlargement of the liver and spleen resulting from extramedullary hematopoiesis and direct viral cytopathic effect on these organs.

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