CPP calculation — FRCA Primary MCQ
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Correct answer: C — 50 mmHg
CPP is MAP minus ICP, giving 50 mmHg. 5.3 kPa is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. 90 mmHg is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. 25 mmHg is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. 100 mmHg is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA physiology, the correct answer is usually the variable that best explains the observed change in the anaesthetised patient.
Reference: West's Respiratory Physiology; Ganong Review of Medical Physiology; Primary FRCA textbooks