http://www.cnr.it/ontology/cnr/individuo/prodotto/ID47163

Impact of hypobaric hypoxia on blood flow distribution in frontal lobes (Articolo in rivista)

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Impact of hypobaric hypoxia on blood flow distribution in frontal lobes (Articolo in rivista) (literal)

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Pagani M, Salmaso D, Sidiras G, Jonsson C, Jacobsson H, Larsson SA, Lind F (2011)
Impact of hypobaric hypoxia on blood flow distribution in frontal lobes
in Acta Physiologica Scandinavica; Karolinska Institutet, Editorial Office, Stockholm (Svezia)
(literal)

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Pagani M, Salmaso D, Sidiras G, Jonsson C, Jacobsson H, Larsson SA, Lind F (literal)

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Institute of Cognitive Sciences and Technologies, CNR, Rome & Padua, Italy Department of Nuclear Medicine, Karolinska University Hospital, Stockholm, Sweden Diving & Hyperbaric Medicine Unit, Athens Naval Hospital, Athens, Greece Department of Anaesthesiology, Hyperbaric Medicine, Surgical Services & Intensive Care, Karolinska University Hospital, Stockholm, Sweden (literal)

Titolo

Impact of hypobaric hypoxia on blood flow distribution in frontal lobes (literal)

Abstract

Aim: Acute hypobaric hypoxia is well known to alter brain circulation and to cause neuropsychological impairment. However, very few studies have examined the regional changes occurring in the brain during acute exposure to extreme hypoxic conditions. Methods: Regional cerebral blood flow response to hypoxia was investigated in six healthy subjects exposed to either normobaric normoxia or hypobaric hypoxia with ambient pressure/inspired oxygen pressure of 101/21 kPa and 50/11 kPa, respectively. After 40 minutes at the desired pressure they were injected 99mTc-HMPAO and subsequently underwent Single Photon Emission Computed Tomography. Regional Cerebral Blood Flow distribution changes in the whole brain were assessed by Statistical Parametric Mapping, a well established voxel-based analysis method. Results: Hypobaric hypoxia increased regional cerebral blood flow distribution in sensorymotor and prefrontal cortices and in central structures. PaCO2 correlated positively and SatO2 negatively with regional cerebral blood flow in several temporal, parahippocampal, parietal and central structures. Conclusions: These findings underscore the specific sensitivity of the frontal lobe to acute hypobaric hypoxia and of limbic and central structures to blood gas changes emphasising the involvement of these brain areas in acute hypoxia. (literal)

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