Configuraçäo esférica do aparelho valvar aórtico

Fontes, Ronaldo Ducceschi; Bonassa, Jorge; Jatene, Adib Domingos

Objetivo - Estudar o anel aórtico humano e verificar a possibilidade de reproduzí-lo artificialmente. Métodos - A configuração anatômica de seis valvas aórticas normais foi estudada através de injeção de borracha de silicone na aorta ascendente, obtendo-se moldes rigidos do aparelho valvar aórtico. A partir desses moldes, obtiveram-se modelos de epoxi correspondentes ao anel valvar aórtico.

Foram considerados os seguintes parâmetros:

diâmetro da base (Db), diâmetro das comissuras (Dc), altura (h) e a relação Db/Dc e Db/h. Foram determinados a média e o desvio padrão dos valores obtidos. Resultados - A análise dos moldes indica que o anel valvar aórtico deriva de uma esfera.

As medidas obtidas foram:

Db = 22 ± 1,67 mm Dc = 19,67 ± 1,3 mm; h = 16,00 ± 1,09 mm; Db/ Dc = 1,12 ± 0,04 e Db/h = 1,38 ± 0,10. Conclusão - A partir destas figuras foi possível definir a configuração esférica ou semi-esférica do anel valvar aórtico e reproduzir sua configuração na confecção da biopr

Purpose - To study the normal human aortic valvular ring, and to evaluate the possibility of reproducing its shape artificially. Methods - The anatomical configuration of six normal aortic valves was studied through the injection of silicone rubber in the ascending aorta. From the resulting casts, epoxi models corresponding to the aortic annulus were obtained.

The following parameters were determined:

diameter of the base (Db), diameter of the commissures (Dc), height (h) and the Db/Dc and Db/h relationships. The mean value (x) and the standard deviation (SD) of each parameter were studied. Results - The observation of the casts indicate that the aortic valvular ring derives from a sphere.

The measures obtained were:

Db = 22 ± 1.67 mm; Dc = X 19.67 ± 1.3 mm; h = 16.00 ±1.09 mm; Db/Dc = X = 1.12 ± 0.04 and Db/h =1.38 ± 0.10. Starting from these figures it was possible to define the spheric configuration of the aortic valvular ring, as well as to reproduce it artificially. Conclusions - The aortic valvular ring has a configuration derived from a sphere or hemi-sphere. The parameters obtained from the above program, it was possible to reproduce theconfiguration of the aortic valvular ring and to use it for a bioprothesis