My LBBB post AV replacement diminished with physical exersize (oppisit of typical effect). I was on 12.5 mg metoprolol/day and stopped about 8 months ago after years of excellent stress ECHO exams. Since then my EF has significanly dropped from 60% to 39% and MI deteriorated. Is it possible the Meto was an actual help? 60 yeas and cardio/weight train excersize 3x/wk, AV replaced 6 years ago with mechanical valve.