Echocardiographic measurements in normal preterm and term neonates

Area of Science:

• Neonatal Cardiology
• Pediatric Echocardiography
• Cardiovascular Physiology

Background:

• Establishing normative echocardiographic data is essential for accurate diagnosis in neonates.
• Very low birth weight infants present unique physiological challenges impacting cardiac function.

Purpose of the Study:

• To define normative intracardiac dimensions and systolic time intervals in very low birth weight infants.
• To provide a database for a computer program interpreting M-mode echocardiograms.

Main Methods:

• Collected M-mode echocardiograms from 210 healthy preterm and term neonates.
• Analyzed data based on birth weight and gestational age.
• Correlated cardiac dimensions and intervals with infant characteristics.

Main Results:

• Left ventricular dimensions increased with birth weight (r=0.84, 0.78).
• Left atrial and aortic root dimensions showed a parabolic relationship with birth weight.
• Left ventricular shortening fraction and LA/Ao ratio remained constant across weight subgroups.

Conclusions:

• Normative data for intracardiac dimensions and systolic time intervals were established for very low birth weight infants.
• Findings support the development of automated echocardiogram interpretation tools.
• This data aids in the clinical assessment of neonatal cardiac health.