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  • Title: [Cerebral functions in brain-damaged patients. What is meant by coma, vegetative state, minimally conscious state, locked-in syndrome and brain death?].
    Author: Faymonville ME, Pantke KH, Berré J, Sadzot B, Ferring M, de Tiège X, Mavroudakis N, van Bogaert P, Lambermont B, Damas P, Franck G, Lamy M, Luxen A, Moonen G, Goldman S, Maquet P, Laureys S.
    Journal: Anaesthesist; 2004 Dec; 53(12):1195-202. PubMed ID: 15597160.
    Abstract:
    Comatose, vegetative, minimally conscious or locked-in patients represent a problem in terms of diagnosis, prognosis, treatment and everyday management at the intensive care unit. The evaluation of possible cognitive functions in these patients is difficult because voluntary movements may be very small, inconsistent and easily exhausted. Functional neuroimaging cannot replace the clinical assessment of patients with altered states of consciousness. Nevertheless, it can describe objectively how deviant from normal the cerebral activity is and its regional distribution at rest and under various conditions of stimulation. The quantification of brain activity differentiates patients who sometimes only differ by a brief and incomplete blink of an eye. In the present paper, we will first try to define consciousness as it can be assessed at the patient's bedside. We then review the major clinical entities of altered states of consciousness encountered in the intensive care unit. Finally, we discuss the functional neuroanatomy of these conditions as assessed by positron emission tomography (PET) scanning.
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