Hi there -
Your mother is experiencing some very suggestive symptoms, both of probable ischemia due to some coronary artery disease (that "plaque buildup" her cardiolgist didn't seem very concerned about, even though she's already had one
myocardial infarction -- MI), and possibly of congestive
heart failure (CHF) as well. While the latter is one possibility -- and with an enlarged left ventricle it is fairly likely -- the
pain is not even especially atypical (women often experience heart
pain in more diffuse and atypical ways and areas) and should be a red flag especially in someone with a prior MI.
The cardiologist's cavalier assessment (he knows she has some "plaque buidup" because of having looked at an
EKG?) and failure to make the connection between established heart disease (which he apparently acknowleges, but hasn't tested for adequately) and new
chest pain (any thoracic
pain suspected of being caused by heart disease may be called "
chest pain" as shorthand for cardiac
pain) really concerns me. Your mother's fatigue and need for extra sleep could be due to something else, but with that apparently enlarged left ventricle it's probably at least in part due to CHF, which should be treated. She also needs to have an angiogram (even if she had one during her original
heart attack) to determine the extent of her disease and to help put together a treatment plan. She should probably be on a
beta blocker at least, and if she's in CHF there are more choices in terms of which
beta blocker, as some work better for this than the usual ones.
I hope this is helpful to you. I'm very glad your mother has you as an advocate. It's important, especially since medical people are often the most likely to deny a serious problem because of their work ethic. Please do continue to encourage her to get this fully worked up. Something is definitely wrong. What it is and to what extent it's wrong is all that's left to determine. Then it can be treated.
Good luck to the both of you, and please follow up with us here.