### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
MY 85 YR OLD GRANDFATHER HAS SUFFERED A HEART ATTACK AND APPARENTLY 3 OF HIS ARTERIES ARE 90 PERCENT CLOGGED.HE JUST FOUND OUT HE IS ALSO DIABETIC AND HAS BEEN FOR OVER A YEAR AND DIDN;T KNOW.HIS DOCTOR SAID HE IS A CANDIDATE FOR A TRIPLE BY PASS BUT HAS A 50/50 CHANCE OF SURVIVAL AND HE WOULD PROBABLY ONLY SURVIVE FOR 2YRS AFTER SURGURY. HE IS VERY SCARED OF THE RECOVERY AND OF DIEING.WHAT DO YOU THINK HIS CHANCES ARE OF SURVIVAL?

### output:

There are many factors one must ad Chat Doctor.  Nonetheless, I think it's fair to say that without surgery; 90% arterial occlusion (depending on one which arteries are involved - there are many arteries and their location around the heart and effect in blockage varies); can indeed lead to even worse outcomes if not repaired. Unfortunately, if the physicians are describing Triple Bypass surgery as opposed to a less invasive option (catheterization), than according to medical treatment guidelines, it is very likely these are very important arteries, which must have adequate blood-flow for survival. Thus, surgery may be the only option to prevent the inevitable (a full-fledged blockage and heart attack which may lead to death). I would assume, and certainly speak to the physicians about this to assess its validity, that his chances for survival in the near future may be improved with surgery, though for an individual of your grandfathers demographic, there are great risks to surgery as well. You must weigh your options. 90% occlusion of ones triples vessels will not reverse without intervention, and are not conductive with a positive outlook for continued lifespan. I'm sorry for you and your grandfather, and trust you can all come to a decision which you believe is best and most comfortable for his comfort and well-being.