Purpose: Nalbuphine is becoming a common analgesic used in hysteroscopic operations. The aim of this study was to identify the median effective dose (ED50) and 95% effective dose (ED95) of nalbuphine combined with propofol in painless hysteroscopy.
Patients and Methods: Twenty-five patients aged 18– 60 years with an American Society of Anesthesiologists classification of I–II who were scheduled for painless hysteroscopy were recruited. The initial dose of nalbuphine was set at 0.15 mg/kg and varied by 0.01 mg/kg according to the Dixon sequential method. The ED50/ED95 of nalbuphine combined with propofol for hysteroscopy was calculated by the probit method.
Results: The ED50 of nalbuphine was 0.122 (95% confidence interval (CI) 0.092– 0.137) mg/kg, and the ED95 of nalbuphine was 0.153 (95% CI 0.138– 0.361) mg/kg.
Conclusion: The ED50/ED95 values of nalbuphine combined with propofol in painless hysteroscopy are 0.122 mg/kg and 0.153 mg/kg, respectively. Nalbuphine at 0.153 mg/kg combined with propofol is effective and safe for painless hysteroscopy.
Keywords: nalbuphine, propofol, hysteroscopy, effective dose, ED50, ED95