Cabg surgery -should I travel to singapore for this?

Why. CABG surgery has been a standard intervention in the us for the treatment of coronary artery disease for many years. You may have it here without any problem. If money is the issue and it can be done in singapore for much less, you may consider this option, but be aware of pitfalls associated with it such as need for follow up, reputation of clinic/mds doing it, etc.
Not likely. There are very good places all over the usa. There is a new market for "surgical vacations" have a family trip and get surgery at one low price. We do see folks who have travelled and then have a problem far away or come home with bigger bills and bigger problems singapore is reported to be lovely, interesting and a safe place.