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Basic Principles of Colour Doppler Echocardiography

All About Cardiovascular System and Disorders

Usual colour Doppler echocardiogram is superimposition of colour Doppler images on a two dimensional echocardiogram. Colour M-Mode is superimposition of colour Doppler images on an M-Mode echocardiogram. For example, when the VSD is small, the pressure difference between the right and left ventricles is high.