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Cerebral blood flow autoregulation curve. Autoregulation is the physiologic mechanism that holds the blood flow to the brain constant across a range of blood pressure. The flat area of the curve is a state of pressure reactivity where blood pressure and blood flow go in opposite directions. However, outside the range of auto-regulation on the two ends is a state of pressure passivity where blood flow is purely dependent on blood pressure. There is no more reactivity in the vessels
