What you can do is ask both your psychiatrist and cardiologist or primary physican to speak to each other, and at the same time, give each of them a simple, signed written consent to talk to each other saying they can discuss cardiac meds or med effects that each of them prescribe.
I imagine you get a cardiac exam or at the very least, a yearly 12 lead ekg done every year, Sorry to hear you had a myocardial infarction a while back. I think it is so great that you are watching out for yourself and thinking about such things. What I suggested is what I do. It helps alot and the physicians actually appreciate and don't mind talking to each other,
Your doctor should speak to your psychiatrist to make sure
your cardiac medications would not interact with any psychiatric medications you are prescribed. All atypical antipsychotics (current generation from Risperdal onward) have the potential to cause as an adverse side effect cardiovascular concerns and this should be discussed between your doctor and psychiatrist as well. Also ask them
if any follow up tests such as an ekg could be of help. After follow up they would be able to discuss these concerns with you more
fully within their clinical discretion.
As they would be aware of the clinical specifics of these prescriptions, if they determine it is safe for you then the best thing to do would be work with them as regards the Abilify and update them how you are doing on a regular basis.