Comparison between hemodynamic effects of propofol and thiopental during general anesthesia induction with remifentanil infusion: a double-blind, age-stratified, randomized study

PurposePropofol is commonly used with remifentanil for induction of general anesthesia (GA); however, it often leads to hypotension. Intraoperative hypotension is associated with postoperative adverse events. By contrast, thiopental has less negative inotropic effects on hemodynamics compared to propofol, which could be suitable to prevent hypotension during GA induction. In the present age-stratified, randomized, assessor-blinded study, using the ClearSight((R)) system, we compared the hemodynamic effects of propofol and thiopental during GA induction under remifentanil infusion in non-cardiac surgery.MethodsPatients were divided into young (20-40year), middle (41-70year), and elderly (>70year) groups (n=20, each group). General anesthesia was induced with remifentanil 0.3 mu g/kg/min, followed by propofol (2.0, 1.5, and 1.2mg/kg) or thiopental (5.0, 4.0, and 3.0mg/kg) in the young, middle, and elderly groups, respectively. The primary outcome was the difference in the decrease in mean arterial blood pressure between patients receiving propofol and thiopental in each age group. The secondary outcomes included other hemodynamic parameters and minimal bispectral index values measured up to 10min after tracheal intubation.ResultsThe decrease in mean arterial blood pressure was greater in patients receiving propofol than those receiving thiopental (-45.4 vs -26.6mmHg and -45.7 vs -28.9mmHg, P=0.003 and 0.007, respectively), whereas no significant difference was observed in the young age group (P=0.96).ConclusionsThiopental is a more suitable agent than propofol for avoiding hypotension during GA induction under remifentanil infusion in the middle and elderly patients.