I have a clinical question about intracranial pressures.

I’m on for the night and received a pt who fell from a second story window in the neuro ICU. Settings currently are A/C VC 500 x18 +5 40%. Goal is to keep the intracranial pressure below 15 obviously, but with the EVD currently open the measurement isn’t accurate. IF my patient’s ICPs get higher, wouldn’t it be more prudent to use a more like PRVC to help keep the pressures lower?