Obstruction of Left Ventricular Outlet in Association with Ventricular Septal Defect

In a pathologic collection of 722 congenital heart lesions we have observed 10 cases in which a ventricular septal defect was associated with obstruction to normal left ventricular outflow. These cases are presented in the framework of a classification relating hemodynamics to the position of the obstructing lesion and the size of the ventricular septal defect. One additional case observed clinically and at operation is also reported to make more nearly complete the classification of the anatomic arrangements in which the common denominators are ventricular septal defect and obstruction to normal ventricular outflow.