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Degenerative Mitral Valve Disease (view source)
Revision as of 14:00, 29 June 2016
, 14:00, 29 June 2016→Echocardiography
* Colour Doppler jet of mitral regurgitation
* Colour Doppler jet of mitral regurgitation
*(Flail leaflet)
*(Flail leaflet)
Thickening of the mitral valve leaflets is usually diffuse, but most pronounced at the leaflet edges. With myxomatous degeneration, the mitral valve becomes stiffer and distorted. The conformation of the valve remains constant throughout the cardiac cycle. Normally, the mitral valve leaflets do not extend beyond a line across the mitral annulus in systole. In dogs with DMVD, the mitral leaflets prolapse towards the left atrium during systole. Colour Doppler can be used to demonstrate the jet of mitral regurgitation. The size of the jet is related to the severity of mitral regurgitation. Most mitral regurgitation jets in DMVD are eccentric.
Thickening of the mitral valve leaflets is usually diffuse, but most pronounced at the leaflet edges. With myxomatous degeneration, the mitral valve becomes stiffer and distorted. The conformation of the valve remains constant throughout the cardiac cycle. Normally, the mitral valve leaflets do not extend beyond a line across the mitral annulus in systole. In dogs with DMVD, the mitral leaflets prolapse towards the left atrium during systole. Colour Doppler can be used to demonstrate the jet of mitral regurgitation. The size of the jet is related to the severity of mitral regurgitation. Most mitral regurgitation jets in DMVD are eccentric.
The more severe the DMVD, the greater the degree of left ventricular and left atrial dilation.
The more severe the DMVD, the greater the degree of left ventricular and left atrial dilation.
Fractional shortening may be increased (hyperynamic left ventricle). This is because, in the setting of mitral regurgitation, impedance to ventricular emptying is reduced (blood can be ejected into the low pressure left atrium)and end-diastolic ventricular stretch is increased by the addition of the regurgitant fraction, increasing the force of contraction.
Fractional shortening may be increased (hyperynamic left ventricle). This is because, in the setting of mitral regurgitation, impedance to ventricular emptying is reduced (blood can be ejected into the low pressure left atrium)and end-diastolic ventricular stretch is increased by the addition of the regurgitant fraction, increasing the force of contraction.