The pre-op is more about getting the latest pictures and getting paperwork filled out then anything else. I had a CT done during my preop , which was also done about a week before the actual install.
Congrats on deciding to get it done. Curious as to which you are going with , AB or med-el ? I am currently waiting to have my second CA unit installed , but have been on hold due to the recall.
That 0% number mentioned previously is hyperbole. Not saying that there is any huge risk of death , just that it is an actual surgery with full anesthesia with all the risks associated with that. It is prudent to have things in order.
The largest risk is having the facial nerve nicked or cut. However this has been getting rarer and rarer now that the usage of facial nerve monitors are increasing. You may want to ask your surgeon if they will be using one.
There has also been studies that indicate higher risk of meningitis , so your surgeon may recommend that you get vaccinated for that.