Fetal echocardiography; basic and clinical considerations

Area of Science:

• Cardiology
• Fetal Medicine
• Medical Imaging

Background:

• 2-D real-time and M-mode imaging systems provide detailed insights into fetal cardiac function.
• Fetal ventricles exhibit geometric uniformity antenatally.
• Understanding normal fetal cardiac development is crucial for diagnosing abnormalities.

Purpose of the Study:

• To analyze fetal cardiac geometry and function using advanced imaging techniques.
• To establish normative data for fetal left ventricular volume, stroke volume, and output.
• To explore the diagnostic capabilities of cardiac imaging for congenital heart disease and dysrhythmias.

Main Methods:

• Utilized 2-D real-time and M-mode echocardiography for fetal cardiac assessment.
• Performed structural analysis of the fetal heart.
• Measured left ventricular volume (Q1v), stroke volume (Q1v,s), and output (Q'1v).

Main Results:

• Demonstrated a curvilinear increase in left ventricular volume, stroke volume, and output during the third trimester.
• Recorded a mean term left ventricular output (Q'1v) of 126 +/- 11 ml kg-1 min-1.
• Successfully diagnosed fetal congenital heart disease and cardiac dysrhythmias through structural analysis.

Conclusions:

• 2-D real-time and M-mode imaging are valuable tools for assessing fetal cardiac geometry and function.
• Fetal cardiac output undergoes significant changes in the third trimester.
• Cardiac imaging facilitates the antenatal diagnosis of congenital heart defects and arrhythmias, with ongoing research into treatment options.