This research was presented at the American College of Cardiology in conjunction with their 62nd Annual Scientific Session. The general picture was that high dose vitamins and minerals do not reduce your chance of having a recurrent heart attack, however, there was some evidence to suggest that if these vitamins and minerals are taken in conjunction with something called Chelation Therapy, they may actually provide additional benefits.
Chelation treatment on its own does seem to provide a reduction in recurrent heart attacks, when studies are done on it, alongside studies on those who are receiving some kind of placebo therapy instead. The reduction was fairly modest, but there did seem to be a pattern of reduction in cardiac events (including heart attack, coronary revascularisation, angina that requires hospitalisation, stroke and death).
When given in conjunction with high dose oral vitamins and minerals, however, the chelation therapy seemed to be far more effective, although scientists warn that much more work is now needed on these results in order to fully understand why this might be the case.