Normal serial variability for M-mode and digitized echocardiography in a pediatric population

Area of Science:

• Pediatric Cardiology
• Diagnostic Imaging
• Biomedical Engineering

Background:

• Serial echocardiography is vital for monitoring pediatric cardiac health.
• Understanding the normal variability of echocardiographic measurements is essential for accurate interpretation.
• Previous studies have not fully characterized the comparative variability of M-mode and digitized echocardiography in children.

Purpose of the Study:

• To assess and compare the normal serial variability of M-mode and digitized echocardiography in healthy children.
• To establish normal limits of variability for various echocardiographic parameters.
• To guide the appropriate use of echocardiography in pediatric follow-up studies.

Main Methods:

• 18 healthy children (aged 3-16 years) underwent serial M-mode echocardiography one month apart.
• Ejection fraction and shortening fraction were measured using standard M-mode techniques.
• Digitized echocardiograms were analyzed for peak and normalized left ventricular, posterior wall, and septal wall velocities.
• A four-factor hierarchical variance components analysis was used to determine variability.

Main Results:

• Standard M-mode measurements (shortening fraction, ejection fraction) exhibited the least variability (10-15% of mean).
• Digitized echocardiography revealed higher variability in velocities: left ventricular (18-29%), posterior wall (26-45%), and septal wall (38-68%).
• M-mode echocardiography demonstrated significantly less serial variability compared to digitized echocardiography in this pediatric cohort.

Conclusions:

• M-mode echocardiography offers greater reproducibility for serial measurements in children compared to digitized methods.
• The established normal variability limits provide a benchmark for interpreting changes in pediatric echocardiographic studies.
• These findings underscore the importance of considering measurement variability when assessing cardiac function in pediatric follow-up.