What are benefits or risks of doing angioplasty stent on chronic two total 100% occlusions.

acute or chronic?: If the occluded vessels are associated with a heart attack implying that they have just occurred (that in itself is odd because there is generally only 1 culprit vessel), there's benefit in trying to re-open it and stent it. If they are chronic, total occlusions, there is no benefit and the risks outweigh any minor potential benefit.