Good to hear you heeded your symptoms after the negative stress test. Beyond the degree of occlusion at your lesion sites that the angiogram evidenced, you also likely developed good collateral circulation that served your physiologic demands, until now, so the by-pass channels will add significantly greater blood flow. Good to hear that your CD recognized the low success of pursuing angioplasty, since he/she concluded that the lessions were too highly stenosed to enable them to get the guide wire through to enable the balloon catheter to be inserted and expanded to "crack" your lessions, which would also liberate significant particles to move downstream and raise your risk of stroke. Too often CDs fail to turn patients over to the thoracic surgery team for by-pass, ignoring "Dirty Harry's" admonition on recognizing individual limitations...