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Query: UMLS:C0020440 (hypercapnia)
 7,939 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Transcranial dopplerography (TDG) examination of the blood flow along the major intracranial arteries and cerebral vascular response to functional loads was performed in 51 patients with stenosis and/or occlusion of the internal carotid artery (ICA). The measurements were made on the equipment "Quantascope-103 PC" (Scimed, England). 74% (26 patients) of ICA occlusion subjects had asymmetry of the linear circulation rate (LCR) in the middle-size cerebral arteries (MCA). It occurred with LCR inhibition on the ipsilateral to the occlusion side. In half of ICA stenosis patients the ipsilateral MSA circulation was also reduced. The difference between the two groups in relation to MCA circulation asymmetry was significant (p < 0.001). Nitroglycerin and hypercapnia tests proved more informative than ortho- and antiorthostatic tests. A relationship was found out between overall stenosis of major brain arteries and blood flow along them.
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PMID:[Functional transcranial dopplerography in an atherosclerotic lesion of the carotid arteries]. 794 80

Changes in cerebral hemodynamics (CH) was assessed with transcranial color duplex scanning in the middle cerebral artery (MSA) of 15 healthy male volunteers aged 20-23 years in response to psychoemotional stress (PES). The latter was induced by calculations, mild exercise (Martine's test), hypercapnia in inspiration of 6% CO2 and their various combinations. The results showed that a combined action of the stressors differs quantitatively and qualitatively from their isolated action. As a rule, in combination the stressors potentiated each other. The response of CH to a combined action of the stressors, PES and hypercapnia, in particular, may be also characterized by a prevalent effect of one of the stressors, in this case by a stronger action of hypercapnia.
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PMID:[Response of cerebral hemodynamics to combined stress impacts]. 1580 Dec 29