First, many surgeons don't care about the physiologic status of the patient. They just want to know if they can cut. That said, none of them want a patient to die on their table either as that affects their stats. You'll find that you'll just have to use your "better judgment" as to when to let a case go.
Second, you will never "cancel" a case. You may postpone it until medically appropriate, but never cancel. Seems like silly semantics, but sometimes that matters.
We are forever getting add-on hips that are 80-90 years old. Many of them have cardiac issues. The orthopod may not have consulted IM or looked the medical history over and want to go straight to the OR. Example: 85-year old male fell and sustained a hip fx. Orthopod wants to go do a bipolar. He didn't think to ask "why did said 85-year old fall?" Oh, it was due to his MI! Whether or not cardiology would actually make an intervention is a question for another discussion, but I wouldn't proceed unless absolutely necessary in this case.
PMMD