When in the short axis view with the papillary muscles and chordae tendineae in view place the M. mode cursor between the papillary muscles and obtain an M-mode trace of cardiac function.

• 当心室乳头肌与其腱索呈现在短轴图像时，将M模式的屏幕游标放在心室的乳头肌之间，同时藉由M模式探测心脏的功能。