Well, hopefully that will help you out then, with the new medications. I hate it when you have no say in when they will fix something! What about quality of life? So your heart gets 50% of the oxygen it should have and they are just going to wait despite your heart muscle damage. You are going to be tired a lot i am thinking.I have had sleep study before and was borderline. It will be done at hospital. all the stickys that will fit on my head. Its not too bad. Lady let me have a smoke in the bathroom so I was able to go to sleep after that. The other blockages they hope to fix the 90% with meds (Imdur) and cholesterol . The 50% is in a stent and not enough blockage to fix it yet.