I am diabetic, and also ended up with a pacemaker through surgical complications doing my AVR (apparently a 1 in 10 risk), so some of this medication may not be relevant. But heart wise I am also on aspirin, Nebivolol (a different Beta Blocker to Metoprolol, mentioned by others, which I found exacerbated another condition more than the Nebivolol does), a small dose of Lisinopril, even though I have quite low blood pressure, and Spironolactone. Of these, I was only on Lisinopril prior to surgery.