Polygraphie du sommeil avec enregistrement de la pression intracranienne et mesure du volume sanguin cérébral chez le nourrisson hydrocéphale

Misès, J; Gabersek, V; Lacombe, J.; Hirsch, J F; Pierre-Kahn, Alain; Zouaoui, A.; Barritault, L.; Rimbert, J. N.; N'Geh, R.

doi:10.1016/s0370-4475(79)80003-9

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…During DS, an increase in blood volume (Risberg et al 1969b;Risberg and Ingvar 1973;Mises et al 1979;Vern et al 1987;Strassburg et al 1988) To solve it would be of great theoretical importance, since this would help to clarify the functional meaning of the CBF increase in DS. In fact, the movement of lipid-soluble substances across the bloodbrain barrier is mainly limited by blood flow: an increase in the surface area enhances the passage of lipid-insoluble substances.…”

Section: E R E B R a L B L O O D V O L U M E A N D I N T R A C R A mentioning

confidence: 99%

Brain metabolism and blood flow during sleep

Franzini

1992

Journal of Sleep Research

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sleep/wake cycle, as sleep stages often alternate with a On the other hand, however, many problems concerning shorter time constant, with DS, in particular, normally not cerebral blood flow and metabolism remain to be solved lasting that long. A common strategy in most sleep studies (e.g. the regulation of blood flow, the nature of the has been, therefore, to correlate glucose utilization during flow-metabolism coupling, the existence of capillary measurement with the time spent in different sleep/wake recruitment, and the extent of non-oxidative metabolism).states (weighted for variations in glucose plasma concentraSleep is a natural, stereotyped, repetitive phenomenon, tion (in animals) and positron emission tomography (in humans) model with which to address these specific problems, while are hereafter considered separately, the same common logic findings about brain circulation and metabolism during sleep applies and their results are, in principle, comparable. will foster our understanding of brain circulation and metabolism in general.(a) Autoradiography studies Rat: Ramm and Frost (1983) found no correlation between this reason experimental data in this field have been tightly graphy), and (ii) C E R E B R A L E N E R G Y METABOLISM Direct measurements2.1.1 Local cerebral glucose utilization. When Greenberg wrote his review in 1980, very few attempts had been made to measure directly cerebral metabolism during sleep (Mangold et al. 1955;Meyer and Toyoda 1971) and, due to limitations in methodology, none could address the issue of regional differences in metabolic activity. The rather long list of papers considered in this section bears witness to the mean cerebral glucose utilization (reflected by mean optical density in the autoradiographs) and the different sleep/wake states. They also considered the "relative metabolic activity", which was calculated as the regional optic density given as a proportion of the mean brain optic density; this expresses the level of metabolic activity in a region relative to the mean level in the brain. During SS, relative metabolic activity decreases in the cerebellum, in most thalamic nuclei and in cortical layer IV, and increases in some hippocampal and hypothalamic structures. DS is associated with a relative decrease in metabolic activity in the cerebellum, and a relative increase in some brainstem regions (e.g. pontine Pavlides et al. (1987) reported a decreased cerebral glucose Correspondence: Institute Fisiologia Umana, Porta S. Donato 2, raphe, gigantocellular tegmental field, substantia nigra).

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Section: E R E B R a L B L O O D V O L U M E A N D I N T R A C R A mentioning

confidence: 99%

Brain metabolism and blood flow during sleep

Franzini

1992

Journal of Sleep Research

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Vasomotor origin of intracranial pressure waves in hydrocephalic infants

et al. 1980

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By measuring cerebral blood volume (CBV) and intracranial pressure (ICP) variations at the same running time during sleep, it has been demonstrated that the ICP wave which appears during the REM sleep in hydrocephalic infants is produced by intracerebral vaso-dilatation. Nine infants with stabilized hydrocephalus were investigated by non-invasive means: REM phases were distinguished with the usual polysomnographic electrodes. Intracranial pressure was measured with a fontanel palpation transducer and CBV variations were obtained by recording 99mTc activity at the head level after in vivo labelling of red cells with 99mTc--pertechnetate. The time-activity curves, obtained from regions of interest and selected on the sequential radioisotope images, show that an increased ICP wave, occurring during the REM period, is related to a simultaneous increase in the blood volume, limited to the cerebral sector and not to the area of the external carotid artery.

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Polygraphie du sommeil avec enregistrement de la pression intracranienne et mesure du volume sanguin cérébral chez le nourrisson hydrocéphale

Cited by 2 publications

References 10 publications

Brain metabolism and blood flow during sleep

Brain metabolism and blood flow during sleep

Vasomotor origin of intracranial pressure waves in hydrocephalic infants

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