Subpulmonary obstruction caused by aneurysm of the membranous ventricular septum. Study of two cases

Aneurysms of the membranous ventricular septum can exceptionally produce su bpulmonary obstruction. We report two patients, an 8-year-old and a 2-year-old respectively, with a perimembranous ventricular septal defect and subpulmonic stenosis caused b y an aneurysm of the membranous septum. Diagnosis was made by Doppler two-d imensional echocardiography and was confirmed by cardiac catheterization an d was surgery. It is shown that this obstruction may appear late due to the growth of the aneurysm. In conclusion, we believe that the appearance of an aneurysm on a ventricul ar septal defect is not always beneficial, as it may result in right ventri cular outflow tract obstruction or other kinds of complications which may r equire cardiac surgery.