<s>[INST] Hello, my husband had a mitral valve repair Jan. 30th of this year. He seemed to be doing well, when he all of a sudden, had trouble breathing, especially when tries to lie down. Have you heard of this, and what is the proper procedure for fixing it? He did not have any lung problems before. Thanks, Pat [/INST] Hello,  The symptoms You describe occur due to fluid in the lungs, the reason may be varied And speculation based  on this small history is not justified.    I would  strongly request you to get a 2 d echo and visit your cardiologist with the same.  Regards Dr Priyank Mody </s>