Reduce cardiac workload...I take an ACE inhibitor and a beta blocker (coreg) to reduce the heart's workload. The ACE inhibitor dilates vessels, etc. and most beta blockers slows and stabilizes the heart rate, but Coreg is not just a beta blocker, it also has some ACE inhibitor characteristics as well..
Doesn't the AICD control the heart rate and negate that aspect of Coreg?