Developmental Changes in Left and Right Ventricular Function Evaluated with Color Tissue Doppler Imaging and Strain Echocardiography

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Aims: We evaluated the systolic and diastolic functions of both ventricles from the early neonatal period to adolescence using color tissue Doppler imaging and 2-dimensional tissue tracking echocardiography. Methods: We examined 100 healthy children (aged 1-5 days, n=20; 1 month, n=20; 1 year, n=20; 6-7 years, n=20; and 12-13 years, n=20). Blood flow velocities in the mitral and tricuspid valves (E) were obtained with pulsed Doppler imaging, and longitudinal systolic (S') and early diastolic (E') peak velocities at the mid free wall segment of both ventricles were obtained with color tissue Doppler imaging. For longitudinal strain imaging, systolic peak values were obtained at the same position. In addition, peak systolic radial strain was obtained from a short-axis view of the left ventricle using the tissue tracking method. The E/E' ratio was calculated. Results: Regarding systolic indices, S' increased during development and stabilized at 6 to 7 years, and longitudinal strain reached values of the 12- to 13-year-old group at 1 year of age in both ventricles. Like longitudinal strain, radial strain in the left ventricle reached values of the 12- to 13-year-old group at the age of 1 year. Similarly, the E/E' ratio was high at 1 month or younger and decreased by 1 year. Conclusions: Systolic and diastolic variables change markedly from birth to 1 year of age and show only small changes thereafter.
日本医科大学医学会の論文