Pudendal Nerve Block for Catheter-related Bladder Discomfort Prevention

Inclusion Criteria: * Patients aged 18years to 75years. * American Society of Anesthesiologists (ASA) physical status I, II, or Ⅲ. * Undergoing elective prostate surgery at lithotomy position with urinary catheterization after anesthetic induction under general anesthesia. * Glasgow Coma Scale (GCS) score of 15. Ability to communicate. Exclusion Criteria: * History of bladder dysfunction, such as over active bladder (OAB, urinary frequency: more than three times in the night or more than eight times in 24 h). * History of bladder outflow obstruction. * Neurogenic bladder. * Impaired renal function. * Coagulopathy. * Known allergies to any anesthetic agent. * Family history of malignant hyperthermia. * Impairment of communication or cognition. * Psychopathy. * Active participation in another trial where the primary endpoint follow-up is ongoing. * Unwillingness or inability to comply with protocol procedures.