Brief Hypercapnia Enhances Somatosensory Activation of Blood Flow in Rat
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- Bernd Schmitz
- Department of Experimental Neurology, Max-Planck-Institute for Neurological Research, Cologne, Germany
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- Bernd W. Böttiger
- Department of Experimental Neurology, Max-Planck-Institute for Neurological Research, Cologne, Germany
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- Konstantin-Alexander Hossmann
- Department of Experimental Neurology, Max-Planck-Institute for Neurological Research, Cologne, Germany
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<jats:p>Activation of CBF by hypercapnia or functional stimulation has been attributed to multiple mediators, most of which are thought to interfere with cerebrovascular reactivity in a closely time-related manner. Here we describe that brief hypercapnia produces marked up-regulation of somatosensory activation of blood flow that outlasts carbon dioxide exposure for at least 60 min. In chloralose-anesthetized, mechanically ventilated rats, somatosensory activation was carried out by electrical stimulation of the forepaw. Blood flow was measured in the contralateral primary somatosensory cortex by laser-Doppler flowmetry (LDF). Under control conditions, somatosensory stimulation increased LDF by 38.8 ± 11.0%. Ventilation with 6% CO<jats:sub>2</jats:sub>for 3 min caused a rise of LDF by 28.0 ± 8.7%. Baseline CBF and P<jats:sub>a</jats:sub>co<jats:sub>2</jats:sub>returned to control values within 20 min. Repetition of somatosensory stimulation after hypercapnia revealed a long-lasting up-regulation of the flow response: 25 min after hypercapnia, functional stimulation increased LDF by 86.0 ± 18.1%, and 60 min after hypercapnia even by 96.0 ± 26.0%. This is the first demonstration of CO<jats:sub>2</jats:sub>-induced up-regulation of functional activation of blood flow and an example of the importance of general physiological variables for the modulation of the coupling process.</jats:p>
収録刊行物
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- Journal of Cerebral Blood Flow & Metabolism
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Journal of Cerebral Blood Flow & Metabolism 16 (6), 1307-1311, 1996-11
SAGE Publications
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詳細情報 詳細情報について
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- CRID
- 1360292619993715456
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- NII論文ID
- 30009334904
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- NII書誌ID
- AA10458430
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- ISSN
- 15597016
- 0271678X
- http://id.crossref.org/issn/0271678X
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