ASA physical status III-V.

Severe cardiac, respiratory, hepatic, or renal disease.

Mental status disorder or significant hearing impairment that prevents consent or communication.

Known anxiety, depression, or other psychiatric disorder judged to interfere with study participation.

Withdrawal of consent or investigator decision for safety reasons.

Low-flow Versus Minimal-flow Sevoflurane Anesthesia During Robot-assisted Laparoscopic Radical Prostatectomy