Predicted effect-site concentration of propofol and sufentanil for gynecological laparoscopic surgery
This study was to estimate the predicted effect-site concentration of propofol administered by a target-controlled infusion (TCI) for maintenance of anesthesia based on the bispectral (BIS) index as a measure of hypnosis in laparoscopic surgery. Method:
One-hundred and sixty unpremedicated patients undergoing gynecologic laparoscopy were assigned randomly to receive one of the target effect-site concentrations of propofol 2.0, 2.5, 3.0, 3.5 and 4.0 g/ml during TCI with propofol and sufentanil. The dose–response relationship of propofol for the maintenance of adequate anesthesia based on BIS, movement and hemodynamic response was investigated using a fixed effect-site concentration of sufentanil (0.2 ng/ml). The BIS values, hemodynamic variables, time course during emergence and intraoperative awareness were also assessed. Results:
The predicted effect-site propofol concentrations for adequate anesthesia at the skin incision in 50% (EC50) and 95% (EC95) of patients undergoing gynecologic laparoscopy were 2.2 and 3.7 g/ml, respectively. The predicted propofol EC50 and EC95 to maintain adequate anesthesia in these patients were 2.6 g/ml (95% CI 2.3–2.7 g/ml) and 3.6 g/ml (95% CI 3.3–4.0 g/ml), respectively. The BIS values, effect-site concentration of propofol, hemodynamic data and time course during emergence and post-operative adverse events were comparable in each group. There were no reports of intraoperative awareness in the post-anesthetic care unit. Conclusion:
Based on the anesthetic depth assessed by the clinical signs and BIS monitoring, the predicted effect-site propofol concentrations for the maintenance of anesthesia in patients undergoing gynecologic laparoscopy were similar in those administered adequate anesthesia at the skin incision during TCI.
Document Type: Research Article
Affiliations: 1: Department of Anesthesiology and Pain Medicine, School of Medicine, Konyang University Hospital, Daejeon, Korea 2: Department of Anesthesiology and Pain Medicine, School of Medicine, Inha University Hospital, Incheon, Korea
Publication date: 2011-01-01