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Cerebral Autoregulation MAP Range — FRCA Final MCQ

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EasyNeuroanaesthesiaCerebral Autoregulation MAP RangeFRCA Final

The autoregulation of cerebral blood flow maintains constant CBF across which MAP range in healthy adults?

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Correct answer: E — 60-160 mmHg

Cerebral autoregulation maintains constant CBF across MAP 60-160 mmHg (some sources 50-150). Below lower limit: CBF falls passively with pressure → ischaemia. Above upper limit: CBF rises → hyperaemia, oedema. Autoregulation curve shifts right in chronic hypertension.

Reference: RCOA – 2020 – Primary curriculum: Cerebral circulation physiology