Do you need an empty stomach for mastectomy?

Fasting is not determined by surgery, but by the anesthetic you play. If you are under general anesthesia, you must be on an empty stomach, so as not to cause muscle relaxation, stomach contents flowing back to the trachea, causing suffocation and local anesthesia. It is only around and will not affect the central nervous system of the human body. On the contrary, local anesthesia will make you full.