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[Fetal echocardiography]
1Département de cardiologie et de maladies vasculaires, CHRU de Pontchaillou, Rennes, France.
Insights
Prenatal diagnosis of fetal heart disease using fetal echocardiography is challenging, with many cases undetected. Improved techniques and associated tests are crucial for accurate diagnosis and prognosis.
Area of Science:
- Cardiology
- Fetal Medicine
- Medical Diagnostics
Background:
- Cardiac malformations are common and severe fetal abnormalities.
- Prenatal diagnosis of fetal heart disease remains difficult.
- Fetal echocardiography is the primary diagnostic tool, aiding therapeutic decisions.
Purpose of the Study:
- To highlight the challenges in prenatal diagnosis of fetal cardiac malformations.
- To emphasize the importance of specific echocardiographic views and associated tests for improved diagnostic accuracy.
- To discuss the diagnosis and management of fetal arrhythmias and other cardiac conditions.
Main Methods:
- Utilizing fetal echocardiography, including four-chamber views and ventricular/arterial connection studies.
- Employing M-mode and Doppler modes for analyzing fetal arrhythmias.
- Considering extracardiac abnormalities and karyotype analysis for prognostic evaluation.
Main Results:
- Only 30% of fetal heart diseases are detected, often without known risk factors.
- Many minor heart diseases with favorable prognoses remain undetected.
- Fetal arrhythmias, particularly supraventricular types, are often treatable with maternal therapy.
- Complete heart block and hypertrophic cardiomyopathy in fetuses require specific diagnostic approaches.
Conclusions:
- Enhanced fetal echocardiography protocols are necessary to improve diagnostic sensitivity.
- Comprehensive evaluation including extracardiac and genetic assessment is vital for prognosis.
- Fetal arrhythmias and certain cardiomyopathies necessitate specialized diagnostic and therapeutic strategies.
Abstract:
Cardiac malformations are the most frequent and serious fetal malformations. However their prenatal diagnosis is the less easy. Fetal echocardiography is the main diagnostic tool; in addition it is helpful for the therapeutic orientation. Only 30% of fetal heart diseases are detected on account of maternal or fetal indications, most of them being discovered without any known risk factor. In order to improve its diagnostic sensitivity, fetal echocardiography must include a four chambers view and a study of ventricular and arterial connection. Nevertheless, many heart diseases remain undetected, most of them being minor with favorable prognosis. Search of an extracardiac abnormality and karyotype analysis must be performed in order to explicit the prognosis. Fetal arrhythmias can be analyzed by study of the atrial and ventricular contraction using M-mode echocardiogram or Doppler mode; most of them are supraventricular and accessible to maternal therapy. The sustained fetal bradycardia is frequently a complete heart block whose prognosis depends upon its association with a heart defect and/or a ventricular escape. Antibodies SS-A and SS-B are frequently associated with complete heart block without structural heart defects. Hypertrophic cardiomyopathy may be observed in fetus of diabetic mothers needing an accurate evaluation of the thickness of the interventricular septum. Echocardiography is a part of fetal medicine, which includes the different specialties devoted to the fetus.