[Aneurysm of the membranous interventricular septum. Study by Doppler echocardiography (color mapping in one of the cases)].

Eight patients with aneurysm of the membranous interventricular septum (AMIS) were studied, in all of them the diagnosis was done by Doppler echocardiography (D-E). In all cases, the AMIS was visualized in left parasternal long and short axis views. In six of them by means of apical and subcostal four chamber views. The AMIS was identified as a bag-shaped echo at the level of the interventricular septum; it bulged into right ventricle during systole. Left-to-right shunt was demonstrated by pulsed wave Doppler in 5 patients and in another case with color flow mapping. AMIS has a mild hemodynamic repercussion as is the case with small ventricular septal defects. D-E offers diagnostic advantages, with high specificity if the AMIS is demonstrated in several views and the left-to-right shunt is recognized and quantified by Doppler technique.