Table 2 The times taken to reach the target sevoflurane concentrations using a test lung (A) at variable rates of fresh gas flow (FGF) and different types of anesthesia machine (Primus®, Perseus®, and Zeus®-fresh gas mode), (B) at variable rates of FGF and different modes in Zeus® (Zeus®-F; Zeus® fresh gas mode, Zeus®-A; Zeus® auto-mode) using a lung model. The data are presented as median (95% confidence interval) in seconds. At different FGF rates, but in the same type of AM (Perseus®, Primus®, and Zeus®-F), the time to target concentration shortened as the FGF rate increased (P < 0.05; for simplicity, no statistical remarks are included in the table). Identical data are shown for Zeus®-F mode in Tables A and B. **P < 0.05 for comparisons with Zeus®-F. TCA; target-controlled anesthesia
A. | |||
FGF rate | Primus® | Perseus® | Zeus®-F (fresh gas mode) |
0.5 L/min | 1165 (1150–1185)† | 920* (883–960) | 1590*† (1528–1639) |
1 L/min | 534 (505–538)† | 445* (428–474) | 705*† (690–729) |
3 L/min | 155 (149–164)† | 134* (121–137) | 255*† (247–260) |
B. | |||
FGF rate | Zeus ®-F (fresh gas mode) | FGF rate | Zeus®-A (auto-mode) |
0.5 L/min | 1590 (1528–1639) | Auto-control of FGF by TCA | 380 ** (374–389) |
1 L/min | 705 (690–729) | ||
3 L/min | 255 (247–260) | ||