Optimal cerebral perfusion pressure: are we ready for it?

Area of Science:

• Neurocritical care
• Traumatic brain injury management
• Cerebrovascular physiology

Background:

• Cerebral perfusion pressure (CPP) management in head injury involves divergent approaches.
• Monitoring cerebrovascular pressure reactivity offers an alternative strategy.
• This approach aims to reconcile differing CPP management philosophies.

Purpose of the Study:

• To review indices of cerebral vascular reactivity and autoregulation.
• To explore an individualized CPP target based on optimal reactivity.
• To prevent both injurious hypotension and hypertension in head injury.

Main Methods:

• Review of indices derived from intracranial pressure, near-infrared spectroscopy, and transcranial Doppler.
• Analysis of the relationship between cerebrovascular reactivity and CPP.
• Examination of retrospective data correlating CPP deviation from optimal CPP with patient outcomes.

Main Results:

• Cerebrovascular reactivity and autoregulation indices show a U-shape curve relative to CPP, identifying an optimal CPP range.
• Greater deviation from optimal CPP correlated with unfavorable outcomes in head-injured patients.
• Hypotension below optimal CPP increased mortality, while hypertension above optimal CPP increased severe disability.

Conclusions:

• Pilot studies demonstrate the feasibility of autoregulation-oriented CPP optimization in various patient groups.
• Further prospective studies are needed to confirm if optimal CPP management improves patient outcomes.