Sound Asleep

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NAP5 and the recent controversial guidance from NICE are putting commercial depth of anaesthesia monitors under intense scrutiny. How do they work? Does their use correlate with a reduced incidence of awareness? What is the neurobiological basis for the relationship between EEG activity and depth of anaesthesia? A group from Glasgow have developed a new type of DOA monitor that is a radical departure from the conventional number generation box. Dr John Glenn and Dr Bernd Porr explain how their electroencephalophone (EEP) harnesses the power of the human ear as the system's signal processing unit. By transducing the EEG signal into a real time audible sound wave, the EEP produces a sound that can be used to distinguish between the anaesthetised and the awake patient. Drs Glenn and Porr discuss the potential advantages the EEP holds over traditional DOA monitors, future testing and research, and their open approach to development of this exciting new technology.

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