STUDY OF THE PARIETAL CORONARY SINUS VALVE UNDER SCANNING ELECTRON MICROSCOPY
SUMMARY: The retrograde cardioplegia is a procedure regularly used to protect the miocardium during cardiac surgeries. The cardioplegic solution is retrogradly perfused through the coronary sinus, the main vein of the heart, and it is useful since the coronary venous system has shown to be free of a...
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| Autores principales: | , |
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| Lenguaje: | English |
| Publicado: |
Sociedad Chilena de Anatomía
1998
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| Materias: | |
| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-98681998000200005 |
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| Sumario: | SUMMARY: The retrograde cardioplegia is a procedure regularly used to protect the miocardium during cardiac surgeries. The cardioplegic solution is retrogradly perfused through the coronary sinus, the main vein of the heart, and it is useful since the coronary venous system has shown to be free of any obstructing atherosclerotic disease. The opening of the coronary sinus occurs directly in the right atrium and an ostial valve at this level has long been related. However, a parietal valve in the coronary sinus has renewed the interest in this study. These valves could make difficult a perfect perfusion of the cardioplegic solution, particularly when low coronary sinus pressures are used. In order to understand the morphology of the parietal valve of the coronary sinus we decided to perform a study of the valve under SEM. Six fragments of the coronary sinus containing the parietal valve were taken from adult individuals, post mortem, with no gross cardiac pathologies. The samples were submitted to the usual techniques of Scanning Electron Microscopy. The parietal valve of the coronary sinus showed a half-moon shape, with a well defined structure. Its endothelium was arranged in parallel lines, similar to a stem of a tree, where we could evidence the nuclei of the endothelial cells. Under the endothelial layer we found abundant collagen and elastic fibers. Owing to its developed form seen under SEM, the parietal valve of the coronary sinus must play an important role in guiding the blood flow through the coronary sinus to the right atrium in physiological conditions and could raise difficulties to the flow of the cardioplegic solution during the retrograde cardioplegia. |
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