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Neurometabolic coupling in the vegetative and minimally conscious states: preliminary findings

¹ Department of Clinical Neurophysiology, Addenbrooke’s Hospital, Cambridge, UK
² Wolfson Brain Imaging Centre, University of Cambridge, UK

Correspondence to:
Correspondence to:
M R Coleman
Cambridge Coma Study Group, Box 124, Addenbrooke’s Hospital, Cambridge, CB2 2QQ, UK; mrc30{at}wbic.cam.ac.uk

ABSTRACT
The objective of this study was to determine the integrity of the homoeostatic coupling relationship between neuronal electrical function and cerebral metabolism in the vegetative and minimally conscious states. Ten patients who met recognised diagnostic criteria (six in the vegetative state and four minimally conscious) were investigated using simultaneous electroencephalography and positron emission tomography. It was found that the coupling between neuronal electrical activity and regional glucose metabolism was preserved in all the minimally conscious patients but was absent in all the vegetative state patients. Our preliminary results suggest patients in the vegetative state may endure an impaired coupling relation between neuronal electrical function and cerebral energy metabolism.

Abbreviations: EEG, electroencephalogram; PET, positron emission tomography; PRI, power ratio index

Keywords: minimally conscious state; neurometabolic coupling; vegetative state

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