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
The aortic root and left atrium
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