Conclusion
We confirmed that there is a gradient in the autoregulatory range during propofol and is even more pronounced, during sevoflurane-based anaesthesia. Dynamic CA improves as blood pressure increases (using phenylephrine) during propofol- and sevoflurane-based anaesthesia. This effect is more pronounced for propofol than for sevoflurane. We hypothesise that cerebrovascular tone may be an important underlying mechanism.