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Large arteriolar component of oxygen delivery implies a safe margin of oxygen supply to cerebral tissue

  • Author(s): Sakadžić, S
  • Mandeville, ET
  • Gagnon, L
  • Musacchia, JJ
  • Yaseen, MA
  • Yucel, MA
  • Lefebvre, J
  • Lesage, F
  • Dale, AM
  • Eikermann-Haerter, K
  • Ayata, C
  • Srinivasan, VJ
  • Lo, EH
  • Devor, A
  • Boas, DA
  • et al.
Abstract

© 2014 Macmillan Publishers Limited. All rights reserved. What is the organization of cerebral microvascular oxygenation and morphology that allows adequate tissue oxygenation at different activity levels? We address this question in the mouse cerebral cortex using microscopic imaging of intravascular O2partial pressure and blood flow combined with numerical modelling. Here we show that parenchymal arterioles are responsible for 50% of the extracted O2at baseline activity, and the majority of the remaining O2exchange takes place within the first few capillary branches. Most capillaries release little O2at baseline acting as an O2reserve that is recruited during increased neuronal activity or decreased blood flow. Our results challenge the common perception that capillaries are the major site of O2delivery to cerebral tissue. The understanding of oxygenation distribution along arterio-capillary paths may have profound implications for the interpretation of blood-oxygen-level dependent (BOLD) contrast in functional magnetic resonance imaging and for evaluating microvascular O2delivery capacity to support cerebral tissue in disease.

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