My cardiologist implanted a loop monitor a few weeks ago after I had a TIA last December possibly caused by Tamoxifen and an undetected clotting disorder – Factor 2. Now, a echocardiogram shows moderate tricuspid regurgitatation, which the cardiologist said is related to pulmonary fibrosis from damage to my lung from radiation. I saw my oncologist the other day and he said no way is that possible. Does anyone have any experience with this? I’ve never had heart damage or a heart condition that I’m aware of previous to cancer. Reading up on the condition of course scares me for the future and long term, but the damage is done after 33 doses of radiation 4 years ago.