Reference values for pulse wave Doppler and tissue Doppler imaging in pediatric echocardiography

Area of Science:

• Pediatric Cardiology
• Echocardiography
• Biomedical Engineering

Background:

• Pulse wave Doppler and tissue Doppler imaging are crucial for assessing pediatric cardiac function.
• Existing reference values and Z scores have limitations due to inconsistent methods and small sample sizes.
• Standardized parametric modeling and Z score quality assessment are needed for reliable pediatric cardiac function evaluation.

Purpose of the Study:

• To establish new, standardized reference values and Z score equations for pediatric echocardiography measurements.
• To improve the accuracy of cardiac function assessment in children by adjusting for growth.
• To address limitations of current reference data in pediatric cardiology.

Main Methods:

• Prospective recruitment of 233 healthy children aged 1-18 years.
• Recording of 13 pulse wave Doppler and 14 tissue Doppler imaging measurements.
• Application of parametric nonlinear regression modeling for growth normalization, with analyses for Z score distribution and heteroscedasticity.

Main Results:

• Normalization using body surface area was most effective in accounting for growth compared to age, height, or weight.
• Nonlinear models (polynomial, allometric) demonstrated good fit, and transformations corrected non-normal residual distributions.
• Weighted parametric nonlinear models successfully generated Z score equations with normal distribution and no residual growth association.

Conclusions:

• New Z scores for normalized pulse wave Doppler and tissue Doppler imaging in pediatric echocardiography are provided.
• These standardized values enhance the assessment of cardiac function in pediatric populations.
• Future research should integrate factors like ventricular morphology, loading conditions, and heart rate to define disease thresholds.