I have to say that the demands on blood bank will depend GREATLY on who your facility selects as a surgeon. When we first started CVOR cases, we packed 2-4 units in a cooler and were required to have 4 platelets on hand. Our blood supplier thought that was ridiculous, because none of their other hospitals performing CVOR procedures kept that many platelets. That was 20 years ago, and the surgeons did not wait for Plavix to decrease in the patient's systems prior to operating. We later stopped packing blood for the surgeries because the surgeon thought it was ridiculous, since he never used it. I had never heard of TEG or Rotem until we became Trauma certified, and then we were not asked to get one. Our last surgeon barely used any products at all, but insisted that we get a TEG because that was "state of the art" care. I don't think he ever looked at the results. Since his retirement two months ago, we have had locum tenens physicians who don't know what to do with TEG results, so don't order them, and we are back to using multiple platelets, as well as other blood products.
Best of luck to you.