Pre-operative investigations and fitness for surgery are of utmost importance. This is to ensure that the patient is suitable for surgery, and that both the surgeon and the anesthetist are comfortable with proceeding with the surgery.
Investigations would include blood tests, ECG, chest X-ray and any other investigations deemed necessary by the surgeon and/or anaesthetist. If one is planning for surgery, another good tip of course would be to do things to reduce the chances of the bunion getting worse, whilst waiting for the surgery.
This would usually be footwear education - try not to wear too tight or pointy shoes. If heels are necessary, a lower heel would be better than a 5” stiletto.