Second Bypass surgery

Patient had 5 bypasses done 13 years ago.  Now two of the bypasses have 90-95% blockage.  Options are to put in a stent or due a second bypass.  Patient is 70 years old.  The surgeon has looked at the pictures taken and is recommending the second bypass despite the risks

Does anyone have any experience, statistics, etc about second bypasses?  Any good websites with statistics on success rates?

[anacyde]

I know there is an increased risk, but I don't know how increased.  Personally, I'd like my chances with bypass over my chances of heart attack with such a severe occlusion.  You might want to just google keyword "second cardiac bypass risk" and see what pops up.  

Best wishes.