Myocardial tissue Doppler and long axis function in the fetal heart

Area of Science:

• Cardiology
• Fetal Medicine
• Ultrasound Imaging

Background:

• Current echocardiographic methods for fetal ventricular function are imprecise, leading to inconsistent diastolic function assessments.
• Long axis parameters offer a more insightful approach to evaluating fetal cardiac mechanics.

Purpose of the Study:

• To characterize fetal long axis cardiac function.
• To establish normative reference ranges for fetal long axis cardiac function parameters.

Main Methods:

• Cross-sectional study of 159 normal fetuses.
• Utilized long axis M-mode echocardiography to measure atrioventricular ring displacement.
• Employed pulsed wave Doppler ultrasound to assess myocardial tissue velocities at the ventricular base.

Main Results:

• Demonstrated a strong, near-linear relationship between gestational age and most long axis parameters.
• Observed significant increases in systolic atrioventricular ring amplitude and ventricular wall thickness with advancing gestation.
• Right ventricular filling and myocardial velocities were higher than left, with greater right ventricular long axis amplitude.
• Myocardial tissue Doppler velocities showed similar maturation rates in systole and early diastole for both ventricles.

Conclusions:

• Fetal ventricular function undergoes significant maturational changes in both systole and diastole.
• The rate of maturation for myocardial tissue velocities is comparable between the right and left ventricles.
• Long axis echocardiography provides valuable insights into fetal cardiac development and function.