Take it as a good sign that they aren't speed processing you for the procedure.
By pass surgery is another of Modern medicine miracles. Only in extreme cases will they perform such surgeries if any of the backup systems,lungs , kidneys , liver etc. are in doubt.
My father had quadruple bypass and they held him over because the part of his leg they took a vein from wasn't healing properly. Dr. told us that was the most common cause of holding bypass patients beyond normal time for such a procedure.
It's funny we piss n moan and bitch and complain about Drs. from time to time. Almost as if we expect them to be gods. Thing is with the things they can do nowadays they pert near are.