My father has recently (December) had a triple bypass which, as you can imagine, was all fun and games. He's been feeling a bit tired and breathless again lately and as a result was given another stress test and angiogram combination which, we have now been told, shows that only one of the bypass grafts is working as it should and the other two are, well, not. They're now preparing to place a stent in one of the coronary arteries, but are unsure what to do about the other. Can any of you medical types suggest why the bypass did not work? The consultants and staff have closed ranks and dismissed it as 'one of those things' which I find a less than satisfactory explanation. Don't spare the details. I'm a molecular biologist by trade so I can pick up the vagaries of medical jargon.