My angioplasty (done at local hospital) revealed a 70 percent blockage in the left anterior descending artery (and other significantly lesser blockages). 70% is the threshold for putting in a cardiac stent. That threshold was set because they were putting in too many stents for lesser blockages before. The medication was to keep arteries open until after lung surgery. In fact, there is a study that indicates that people on medication can do as well as people who have stent. After my VAT lung surgery at Mayo, I had Mayo consult to see if I might continue on the medication and not do a stent (I was thinking about the possibility of additional lung surgeries). If you haven't had an angioplasty, I assume they have yet to identify blockages.
Best wishes for your surgery. They have lots of experience at Mayo for lung surgery.