Kristin391,
Thanks for the post.
Q1:"My question is if the problem was due to disease of the valve, then why has there been this change at this time?"
I'm not sure what problem you mean. Do you mean the septal problems? BP can certainly affect valvular regurgitation, and even EF, but would be likely to affect the septum. Pulmonary hypertension can change the septal motion, and can cause progressive disturbances in septal motion.
Q2:"is it true that any amount of amiodarone can result in severe side effects?"
Yes, but 100 mg of amiodarone is associated with a low incidence of side effects.
If you would like to clarify your first question, I'll try to answer it more thoroughly.
The best explanation is that the pulmonary hypertension has lessened, perhaps because the mitral valve is now performing better.
Another possibility is that this TEE missed the findings, which sometimes happens.
Best of luck.