I am afraid your symptoms are suggestive of recurrence of angina and if your stress test is positive then you are obliged to undergo a second coronary angiography to see whether this stent is functioning or blocked and what can be done further. Some times, there may be additional blockages which may be new ones and therefore they may need to be dealt in their own right. It is possible to restent a blocked stent but then all these decisions can be taken only after the coronary angiography has been performed. Generally if a cypher stent has blocked, my personal advise is to go for a bypass surgery the second time as the human bodies tendency can vary from individual to individual and it’s possible that your internal environment of the body is such that such stents are prone to blockage. In any case, the reblockage rate in a medicated stent is also close to 10% so it’s not that they are 100% fool proof. The stent is not replaced but a new stent is deployed, if one decides to go for second time stenting. I hope I have answered your queries to your satisfaction but if you have any further doubts, please feel free to contact us.