BP in brain stims?

So we do a lot of brain stims for Parkinson's. And the surgeon requires a blood pressure of sbp<130 thru the entire case BC she says it is unsafe and can lead to hemorrhage above that SBP. Anyone with experience in these cases? We don't have many surgeons doing this here so I am wondering what your experiences are for these cases. It can get a bit annoying since patient goes from sedated to fully awake to test the stim and some of them freak out/get rly anxious and their bp goes up and... BP in brain stims?
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