Risk factors for delayed recovery in postanesthesia care unit after surgery: a large and retrospective cohort study.

Background: Delayed recovery in the postanesthesia care unit (PACU) after surgery, as a severe occurrence, influences enhanced recovery after surgery. The data from the observational clinical study is a paucity.

Materials And Methods: This large, retrospective, and observational cohort study initially included 44 767 patients.

Daytime variation in non-cardiac surgery impacts the recovery after general anesthesia.

Background: Circadian rhythm involved with physiology has been reported to affect pharmacokinetics or pharmacodynamics. We hypothesized that circadian variations in physiology disturb anesthesia and eventually affect recovery after anesthesia.

Methods: A retrospective cohort study initially included 107,406 patients (1 June 2016-6 June 2021).