ABSTRACT
The hallmark of Motion Mode (M-mode) echocardiography is the high temporal resolution. Distance or depth is along the vertical axis and time on the horizontal axis. The major feature is the ability to see subtle changes in wall or valve motion. Doppler examination is best done with lower frequency transducer and M-mode tracing with high frequency transducer. The beam has to be perpendicular to the cardiac walls and valve. Whereas in Doppler examination as the relationship between path of red blood cells and ultrasonic beam approaches 90, the Doppler signal drops to zero. The posterior left ventricular wall is represented by an endocardial echo which borders the cavity of the left ventricle and epicardial echo which borders the pericardium. The anterior mitral leaflet has an M shaped appearance in diastole with posterior valve leaflet assuming letter W.
