Overview
Fetal cardiomegaly refers to an enlarged heart in utero, often indicative of underlying cardiac or hematologic conditions. It is associated with significant perinatal morbidity and mortality 1.Diagnosis
Key Diagnostic Criteria: Elevated cardiothoracic ratio (≥0.58 predictive of perinatal mortality excluding Bart's anemia) 1.
Recommended Tests:
- 2D Echocardiography: Assess heart size using ratios such as four-chamber area to chest area (normal ≤0.30) or AP diameter of heart to chest (normal ≤0.49) 2.
- Ultrasonography: Evaluate for associated findings like ascites, pericardial effusion, and hydrops 1.Management
First-Line Treatments: Specific treatments depend on underlying cause; no specific drug classes/doses mentioned for general management 12.
Adjunctive Measures: Address associated conditions (e.g., anemia management) and monitor closely for complications 1.Special Populations
Pregnancy: High perinatal mortality noted, particularly in cases of Bart's hemoglobinopathies and earlier gestational age at diagnosis 1.
Comorbidities: Chromosomal abnormalities correlate with higher mortality 1.Key Recommendations
Evaluate fetal cardiomegaly using echocardiographic cardiothoracic ratios for prognostic purposes (Evidence: Moderate) 12.
Early gestational age at diagnosis and presence of skin edema are significant predictors of higher perinatal mortality (Evidence: Moderate) 1.
Consider underlying causes such as cardiac defects, Bart's hemoglobinopathies, and non-Bart's anemia when managing fetal cardiomegaly (Evidence: Moderate) 1.References
1 Wuttikonsammakit P, Uerpairojkit B, Tanawattanacharoen S. Causes and consequences of 93 fetuses with cardiomegaly in a tertiary center in Thailand. Archives of gynecology and obstetrics 2011. link
2 Respondek M, Respondek A, Huhta JC, Wilczynski J. 2D echocardiographic assessment of the fetal heart size in the 2nd and 3rd trimester of uncomplicated pregnancy. European journal of obstetrics, gynecology, and reproductive biology 1992. link90096-h)