Modulation of Evoked Cerebral Blood Flow under Excessive Blood Supply and Hyperoxic Conditions

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We measured the field potential and local cerebral blood flow (LCBF) using laser-Doppler flowmetry in α-chloralose anesthetized rats during activation of the somatosensory cortex by electrical stimulation of the hind paw under independent administration of additional carbon dioxide and oxygen. The aim of this study was to test the hypothesis that the increase in LCBF during activation of the cortex (evoked LCBF) is not directed toward supplying oxygen for oxidative metabolism. Under the hypercapnic condition (PaCO2 = 74.9 ± 14.3 mmHg), the baseline LCBF was about 46.5% higher than that under the normocapnic condition (PaCO2 = 35.7 ± 2.1 mmHg) (p < 0.001), but after normalization for each baseline (divided by the prestimulus level), there was no significant difference in the peak value and the rise time of normalized evoked LCBF. On the other hand, the baseline level of LCBF under the hyperoxic condition (PaO2 = 479.4 ± 77.2 mmHg) was about 5.0% lower than that under the normoxic condition (PaO2 = 105.5 ± 7.8 mmHg) (p < 0.01), suggesting mild vasoconstriction under the condition of hyperoxia at rest. The peak value of normalized evoked LCBF under the hyperoxic condition was about 6.5% higher than that under the normoxic condition (p < 0.05). In addition, the rise time of evoked LCBF was earlier under the hyperoxic condition (0.37 ± 0.16 s) than that under the normoxic condition (0.52 ± 0.12 s) (p < 0.01). The field potential measured during stimulation under hypercapnic and hyperoxic conditions was not significantly different when compared with that under normal gas conditions. These results support our hypothesis and suggest that the excess oxygen is involved in the mechanism underlying the regulation of LCBF.

収録刊行物

  • The Japanese journal of physiology

    The Japanese journal of physiology 50(1), 115-123, 2000-02

    日本生理学会

参考文献:  31件中 1-31件 を表示

被引用文献:  5件中 1-5件 を表示

各種コード

  • NII論文ID(NAID)
    10008290566
  • NII書誌ID(NCID)
    AA00691224
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0021521X
  • NDL 記事登録ID
    5411054
  • NDL 雑誌分類
    ZS8(科学技術--医学--解剖学・生理学・生化学)
  • NDL 請求記号
    Z53-D40
  • データ提供元
    CJP書誌  CJP引用  NDL  IR 
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