If Anyone Thinks Medicine is an Easy Job...

Look at the test results on your chart after open-heart surgery.   (You may prefer to not do the procedure if you are only curious to know.  But the pursuit of knowledge is important,  is it not?)  So many tests to verify blood type of the units to transfuse for you.  Detailed microscopic examination of the replaced parts.   X-rays at the start of surgery and for several days after, looking for stuff that has failed.  I am sure every test has a lawsuit, or at least a grieving widow, behind it.