Most deaths related to noncardiac surgery occur after surgery and after discharge from hospital

It's not the operating room that is risky for patients undergoing noncardiac surgery; it's the recovery period. According to a large international study, only 0.7% of deaths in these patients occurred in the operating room, whereas 29% of deaths occurred after discharge from hospital. The study, which included patients at 28 centres in 14 countries, was published in CMAJ (Canadian Medical Association Journal).

source https://www.lifetechnology.com/blogs/life-technology-news-blog/most-deaths-related-to-noncardiac-surgery-occur-after-surgery-and-after-discharge-from-hospital