Kirklin And Barratt-boyes Cardiac Surgery Pdf Free Download [VERIFIED]
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The patient underwent aortic and mitral valve replacement and a left ventricle free wall resection. The tumor was attached to the mitral valve (Figure 2), but did not involve the aortic valve. Left ventricular function after surgery was normal, and the patient recovered well. Histopathological analysis revealed that the tumor was composed of spindle-shaped cells arranged in fascicles, and the cells were rich in cytoplasm with randomly distributed vesicular nuclei and a few mitotic figures (Figure 3). Immunohistochemistry revealed that the neoplastic cells were positive for desmin (Figure 4) and negative for muscle-specific actin, desmin, myoglobin, H-caldesmon, and S100 protein. The neoplastic cells were negative for HMB45, smooth muscle actin, and myoglobin. On electron microscopy, the tumor was composed of cells with well-developed sarcomeric and Z lines. The cytoplasm contained numerous mitochondria and lysosomes with phagocytosed remnants of myocytes and associated membranes. Other than the sarcomeric striations, there were no other remarkable ultrastructural features observed in this lesion. On immunoelectron microscopy, specific sarcomeric striations were only observed in the cytoplasmic area of the tumor cells, but not in mitochondria or lysosomes. These neoplastic cells immunoreacted with muscle-specific actin, h-caldesmon, desmin, and vimentin, but did not immunoreact with HMB45, smooth muscle actin, and S100 protein. On the basis of these findings, we diagnosed this neoplasm as a spindle cell myofibroblastic tumor. Because we performed an extensive surgical resection, we were unable to perform a functional or molecular analysis on this tumor. However, we were able to examine the expression of Ca2+-regulatory proteins in the cardiac tumor and adjacent normal myocardium because tissue was available after surgery. Therefore, we measured the expression of Ca2+-regulatory proteins, SERCA2a, RyR, NCX, and SLN, in the tumor and in the adjacent normal myocardium of the patient using quantitative real-time polymerase chain reaction.
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