Cardiac WHAT?? Well, I suppose if you ready to have cardiac arrest already, and you did anything that caused any kind of change or stress to the body, anything is possible. To me if you're that sick already you should be under the care of a good ND or lay person schooled in cleansing.
Before you try doing a flush please use common sense and find a protocol such as Hulda Clark 's or Andreas Moritz ' and do the proper preparation. It's a large subject so one or two helpful hints is not going to get you what you really need - a deep understanding of the anatomy and physiology of the liver and gall bladder, and what you're attempting to do with them.
Ask lots of questions too. It never can hurt. Don't try to just do a flush with no preparation or proven protocol though - not a very sound idea.