Problem is that the anesthesiologists give Versed or Midazolam along with the anesthesia. It blocks memory recall of events during surgery.
I made the mistake of telling the anesthesiologist about my previous two experiences of waking up on the operating table and then not wanting to return to my body after surgery. (They had to put me back on the ventilator after surgery for 5 more hours while I visited Heaven again about a year ago during lung removal surgery.)
I’m still recovering from surgery last week. Three days after surgery I stepped out on my deck to call my two dogs that I have had for five years, and I couldn’t remember their names. I checked, and they gave me Versed during surgery and in older people it wears off much slower. Memory is back now.
Those things (out of body experiences) happen even without surgery and anesthesia. People who clinically died and were brought back by simple CPR methods without any chemicals, also often report similar experiences.
So were the documented medieval cases of out of body experiences.