not sure I would guess it's where the blockage is some places they can't put stents I understand .. I was tired all the time ...fluttering in my chest ...short of breath .. etc .. they kept fooh ..foohing it ..

If blockage more than 70 percent, they tend to do CABG.

My husband failed stress test so they took him to cath lab. He had 4 blocked arteries so they did open heart surgery. If one is blocked, a stent should do the trick. Good luck.