The brain is a very interesting and complex organ. To sustain consciousness, satisfactory perfusion and adequate oxygen delivery are vital.1 As the brain has relatively little capacity for energy storage, a continuous supply of oxygen and nutrients must be delivered by uninterrupted cerebral blood flow (CBF).2

Department of Anaesthesia, School of Clinical Medicine, Faculty of Health Sciences, Chris Hani Baragwanath Academic Hospital, University of the Witwatersrand, South Africa

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