Pathophysiology
Clinical meaning
Cerebral Blood Flow (CBF) is autoregulated. When ICP rises, MAP must rise to maintain CPP (CPP = MAP - ICP). If ICP exceeds MAP, perfusion stops. Brain herniation (Uncal, Tonsillar) causes mechanical compression of the brainstem. Connect ICP: Cerebral Perfusion Pressure to bedside cues you will reassess first: vitals trends, work of breathing, perfusion, mentation, and pain or ischemic equivalents when relevant. Boards reward recognizing when subtle instability outweighs reassurance, then selecting nursing actions that protect airway, circulation, and neurologic status before routine tasks.