Final answer:
Chronic mitral regurgitation can cause paradoxical motion of the interventricular septum, where it moves towards the left ventricle during systole instead of the right ventricle.
Step-by-step explanation:
The effects of chronic mitral regurgitation on interventricular septal motion include: Paradoxical motion. Paradoxical motion refers to abnormal movement of the interventricular septum during systole, where the septum moves towards the left ventricle instead of the normal movement towards the right ventricle. This can occur due to left ventricular dysfunction caused by chronic mitral regurgitation. It is characterized by abnormal bulging of the interventricular septum towards the left ventricle during systole.