I had mitral valve repair done 1.5 years ago. Initial symptoms were elevated heart rate with minimal exertion. Dx with severe mitral regurgitation. Surgery was successful. Recovery went well for several weeks, then the symptoms of elevated heart rate minimal activities has come back. Lately symptoms beside elevated HR include fatigue, chest tightness/flutter feeling, leg pain climbing stairs. Recent holter monitor showed highest HR 143 with minimal activity, echocardiogram normal, EF 50%. My resting heart rate is good 60-70, 40 when sleeping. Have been given betablockers which lowered my bp, dizziness. No further answers or treament. Also have rate induced LBBB.