Final answer:
Biventricular dilatation in a patient with a ventricular septal defect (VSD) means that both ventricles of the heart have enlarged due to the presence of the VSD.
Step-by-step explanation:
Biventricular dilatation in a patient with a ventricular septal defect (VSD) means that both ventricles of the heart have enlarged due to the presence of the VSD. In the context of the cardiovascular system, the ventricles are the lower chambers of the heart responsible for pumping blood to the lungs (right ventricle) and the rest of the body (left ventricle). When a VSD is present, a hole exists between the ventricles, causing increased blood flow and pressure, which can lead to enlargement or dilation of both ventricles as they work harder to accommodate the increased volume of blood.