Transcranial color duplex scanning of the cerebral vessels was used to study arterial and venous reactivity in 38 patients in the acute period of cerebral concussion (CC) and in 32 healthy volunteers. Arterial flow was assessed in the middle cerebral artery (MCA) and venous drainage in the basal vein of Rosenthal (BV). Cerebrovascular reactivity was assessed using hypercapnic and orthostatic tests. These studies showed that CC was not accompanied by marked changes in cerebral hemodynamics in the state of rest. During the acute phase of CC, about 20% of patients showed increases in peak blood flow velocity in the MCA, typical of cerebral hyperperfusion. Increases in the peak blood flow velocity in the BV were seen in 25% of patients with CC, compensating for impaired drainage via the superficial cerebral system. In normal subjects, cerebral venous reactivity to hypercapnia was greater than arterial reactivity, while reactivity to orthostasis corresponded to the magnitudes of arterial changes. The absence of quantitative differences in the responses of arterial and venous blood flow to hypercapnia and the predominance of venous reactivity to orthostasis in patients with CC indicates that these patients had impairments in the regulation of venous tone.
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Translated from Zhurnal Nevrologii i Psikhiatrii imeni S. S. Korsakova, Vol. 109, No. 11, pp. 65–68, November, 2009.
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Dicheskul, M.L., Kulikov, V.P. Arterial and Venous Brain Reactivity in the Acute Period of Cerebral Concussion. Neurosci Behav Physi 41, 64–67 (2011). https://doi.org/10.1007/s11055-010-9380-7
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DOI: https://doi.org/10.1007/s11055-010-9380-7