Merck Manual

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Transthoracic Echocardiography
Transthoracic Echocardiography
Transthoracic Echocardiography

Color Doppler echocardiography provides a two-dimensional moving image of the heart. Near the upper left, the heart can be seen beating, and the heart valves can be seen opening and closing. Color Doppler is used to show the direction and speed of blood flow through the atria and ventricles.

Video from Center for Biomedical Communications, College of Physicians and Surgeons, Columbia University.