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Hypertrophic Cardiomyopathy - Feline Cardiomyopathies (view source)
Revision as of 12:14, 3 December 2012
, 12:14, 3 December 2012→Systolic Anterior Motion of the Mitral Valve (SAM)
====Systolic Anterior Motion of the Mitral Valve (SAM)====
====Systolic Anterior Motion of the Mitral Valve (SAM)====
This is where the anterior mitral valve leaflet moves towards the IVS in systole, therefore creating obstruction in the left ventricular outflow tract which interferes with the LV outflow in mid-systole. As a result of this movement, the mitral valve leaflet does not completely seal the atrioventricular annulus; this causes a secondary mitral regurgitation. The combination of turbulent blood flow in the left ventricular outflow tract and mitral regurgitation causes a systolic murmur which can be identified on auscultation.
This is where the anterior mitral valve leaflet moves towards the IVS in systole, therefore creating obstruction in the left ventricular outflow tract which interferes with the LV outflow in mid-systole. As a result of this movement, the mitral valve leaflet does not completely seal the atrioventricular annulus; this causes a secondary mitral regurgitation. The combination of turbulent blood flow in the left ventricular outflow tract and mitral regurgitation causes a systolic murmur which can be identified on auscultation.
The mechanism of SAM is not completely understood. One hypothesis is that deformation of the mitral valve architecture (leaflets, chordae tendinae, papillary muscles) and the hyperdynamic state caused by myocardial hypertrophy cause SAM.
==Clinical Signs==
==Clinical Signs==