Comparing postoperative analgesics requirements and complications between conventional and model-based infusion strategy of intravenous patient-controlled analgesia in patients who undergoing robot assisted laparoscopic radical prostatectomy

Group A: conventional intravenous patient-controlled analgesia, Group B: model-based infusion strategy of intravenous patient-controlled analgesia

The investigators compared postoperative analgesics requirements and complications between conventional and model-based infusion strategy of intravenous patient-controlled analgesia (IV PCA) in patients who undergoing robot assisted laparoscopic radical prostatectomy (RALP)

Group A: conventional IV PCA, Group B: model based IV PCA

1. Primary endpoint: comparison of postoperative analgesic requirements in patient undergoing robot assisted laparoscopic radical prostatectomy (RALP) between conventional patient controlled analgesia (PCA) (Group A) and effective-compartment based dosing strategy of PCA (Group B)
2. Secondary endpoint: 1) VAS analysis between two groups, 2) postoperative nausea and vomiting analysis between two groups, 3) complication evaluation between two groups

Inclusion Criteria:

• Patient who is scheduled to get a robot assisted laparoscopic radical prostatectomy
• Patient who agree to get a patient controlled analgesia

Exclusion Criteria:

• American Society of Anesthesiologist (ASA) physical status over III
• History of alcohol or drug addiction
• History of acute or chronic pain or pain treatment
• Allergic to opioid analgesics
• BMI over 30 kg/m2
• History of sleep apnea or respiratory complications