PICTURES
Note the vegetations along the lines of closure of the valve leaflets. This is one of the hallmarks of rheumatic endocarditis. In this slide, the vegetations are seen as bumps along the division between the trabeculae carnae below and the smooth endocardium above
left ventricular hypertrophy
The hypertrophy in this case is due to an increase in the size of the individual muscle cells. More specifically it is an increase in the components of each cell. By contrast, hyperplasia is an increase in the number of cells. Hypertrophy of the left ventricle is defined as a wall thickness greater than 1.5 cm. There is an associated increase in the weight of the heart. Notice the immense thickening of the wall of the ventricle in this heart: use the ruler as a guide. When referring to an organ, hypertrophy means increased size of the organ and may be due to hypertrophy and/or hyperplasia (if the cells of the organ are capable of mitosis) of individual cells. Hypertrophy and hyperplasia are forms of adaptation and are thus reversible.
Bacterial endocarditis, heart, mitral valve
In this specimen a septic vegetation on the valve leaflet can be seen. The vegetation is the large, reddish, elevated area on the valve leaflet in the center of the slide.
left atrial mitral stenosis sometimes refered to as a third mogul. Determining left ventricle enlargement on a lateral view can be accomplished using Rigler's rule. A line is drawn from the point where the inferior vena cava meets the heart boarder up 2 cm and then a second line is drawn posteriorly from this point 2 cm. If the cardiac boarder is beyond this point than the posterior cardiac boarder is enlarged.
The heart has been sectioned to reveal the mitral valve as seen from above in the left atrium. The mitral valve demonstrates the typical "fish mouth" shape with chronic rheumatic scarring. Mitral valve is most often affected with rheumatic heart disease, followed by mitral and aortic together, then aortic alone, then mitral, aortic, and tricuspid together.
The small verrucous vegetations seen along the closure line of this mitral valve are associated with acute rheumatic fever. These warty vegetations average only a few millimeters and form along the line of valve closure over areas of endocardial inflammation. Such verrucae are too small to cause serious cardiac problems.
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Here are flat, pale tan, spreading vegetations over the mitral valve surface and even on the chordae tendineae. This patient has systemic lupus erythematosus. Thus, these vegetations that can be on any valve or even on endocardial surfaces are consistent with Libman-Sacks endocarditis. These vegetations appear in about 4% of SLE patients and rarely cause problems because they are not large and rarely embolize. Note also the thickened, shortened, and fused chordae tendineae that represent remote rheumatic heart disease.
This specimen shows a heart opened to show the mitral valve, between the left atrium and ventricle. The mitral valve has been infected by a virulent form of bacteria (infective endocarditis). The acute inflammation caused by the infection resulted in the formation of a "vegetation" on the valve, comprised of a mixture of thrombus ("blood clot"), bacteria and inflammatory cells
Chronic Rheumatic Mitral Valve
Note thickening and fusion of chordae and thickening of valve leaflets.
Acute Rheumatic Valvulitis
Note verrucae along lines of closure of the mitral valve
Mitral Valve Prolapse
Note reduplication and tenting of mitral valve leaflets with elongation of chordae
Normal Valve
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