a week before my surgery a coworker (very small office) had her cousin die in the hospital immediately following WLS.
I did not have the health issues he had and it didn't worry me. I was far more concerned that obesity would take my life than this surgery.
However, that being said, anytime I have ever had surgery I did review my will and documents, just in case. I have children, one still a minor, and I think that is just being responsible. I didn't expect to die, but I didn't want to leave anything unclear.