I think you know the answer to the underlying condition that is relieved with nitroglycerine - coronary artery disease. A nuclear stress test or cath will see if you reoccluded your stent. GI or esophogeal pain can also create chest discomfort which is relieved by nitroglycerine. Do yourself a favor and make sure your stent , and the rest of your coronaries are unoccluded.
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DrStephanie
