Reflex Vasoconstriction to a Cold Stimulus for Non-Invasive Evaluation of Neurovascular Function in Man

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  • AIZAWA Yoshifusa
    First Department of Internal Medicine, Niigata University School of Medicine and Shinrakuen Hospital, Kidney Center
  • SHIBATA Akira
    First Department of Internal Medicine, Niigata University School of Medicine and Shinrakuen Hospital, Kidney Center
  • TAJIRI Masaki
    First Department of Internal Medicine, Niigata University School of Medicine and Shinrakuen Hospital, Kidney Center
  • HIRASAWA Yoshihei
    First Department of Internal Medicine, Niigata University School of Medicine and Shinrakuen Hospital, Kidney Center

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  • Reflex Vasoconstriction to a Cold Stimu

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The response of limb blood flow to cold stimulus was determined by venous occlusion technique in 30 healthy subjects. The stress was applied by immersing one hand into icefloating water for 35sec, and the blood flow was measured serially in the contralateral upper limb. The change of blood flow at the 15th sec of stress was the largest among the intermittent measurements, and decreased by 48±8% of the control value. A significant rise in plasma dopaminebetahydroxylase was found in response to the same stress. This simple cold stress test may be used to evaluate the function of the reflex arc involved in reflex vasoconstriction.A significantly diminished vasoconstriction was observed in 12 uremic patients with a concomitantly smaller rise of plasma dopaminebetahydroxylase activity in the test.

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