M-mode (motion-mode) echocardiography is obtained by placing the ‘cursor line’ through the heart, in an area of interest, and displaying the movement of the heart against time through that single line (time-motion graph/display). Time is on the x-axis and motion on the y-axis. The ECG provides a timing reference.

M-mode echocardiography is generally used when performing measurements or observing the motion of structures over time.

Standardisation of cardiac measurements from M-mode has been described the American Society of Echocardiography (Q'Rourke et al. 1984).

Left ventricle

Right ventricle

Mitral valve

The aortic root and left atrium

Aortic value

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