2M-MODE PHYSICSB mode echoes from an interface that changes position will be seen as echoes moving towards and away from the transducer.If a trace line is place on this interface and the resulting trace is made to drift across the face of a CRT screen a motion pattern is obtained.
3M-MODE PHYSICSThe resulting display shows motion of a reflector over distance and time – a distance time graphThe change in distance (dy) over a period of time dt is represented by the slope of the reflector line of motion.dy/dt = slope = velocity
4M-MODE PHYSICSIf this motion pattern is obtained on moving cardiac structures then the resulting images constitute M-mode echocardiography.M-mode echocardiography is use to evaluate the morphology of structures, movement and velocity of cardiac valves and walls and timing of cardiac events.
20M-mode at the Mitral Valve AmplitudeDescriptionNormal ValueEPSSMeasure e point to septal separation< 5 mmd-eMeasures the maximum excusion of the mitral valve following diastolic opening.17 to 30 mm
21M-mode at the Mitral Valve SlopeDescriptionNormal Valued-eMeasure rate of initial opening of the mitral valve in early diastole.240 to 380 mm/se-fMeasures the rate of early closure of the mitral valve following diastolic opening.50 to 180 mm/s
22M-mode Findings at the MV B- bump on the AC shoulderPremature Closure of the MVSystolic anterior motion of the AMVLMitral Valve ProlapseMitral Regurgitation
23M-mode Findings at the MV Flail PMVLFluttering of the AMVLMitral StenosisLA myxomaVegetations
24M-mode at Mitral Valve B-bump on the AC shoulder. Systole Distance TimeDiastoleSystole
25M-mode at Mitral Valve Premature Closure Premature Closure- closure on or before the onset of theQRS complex.DistanceTimeDiastoleSystole
26Systolic anterior motion M-mode at Mitral ValveSystolic anterior motionof the AMVLDistanceTimeDiastoleSystole
27Systolic anterior motion M-mode at Mitral ValveSystolic anterior motionof the AMVLDistanceTimeDiastoleSystole