I had a pacemaker - defibrillator put in a year ago. This was due to weak heart muscle(30%) I was told this could be from chemo 26 years ago. This has caused problems in the left part of my heart! I received a call from my doctor to come in and get it checked a month. At that time they double my meds and put me on another medicine to hopefully increase my muscle in my heart! My defibrillator has not gone off! They said my pacemaker was not pacing. Had my thyroid removed 2 mths. ago because of a nodule that they thought could be cancer. Was wondering if this surgery caused my heart muscle to weaken more or is it because it will continue to weaken because of chemo meds 26 years ago. I am light headed and have a chronic cough was tried and sleep a good bit after surgery but after they doubled my meds most of my sleepiness is gone! I am 68 years old had stage 3 breast cancer at the age of 41. I know I am very blessed to be alive. But still would like to live several more years! Is it possible to keep my heart muscle from getting any worse? Thanks, Brenda