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• W1997485760 abstract "Paradoxical reduction of cerebral blood flow (CBF) after administration of the vasodilator acetazolamide is the most severe stage of cerebrovascular reactivity failure and is often associated with an increased oxygen extraction fraction (OEF). In this study, we aimed to reveal the mechanism underlying this phenomenon by focusing on the ratio of CBF to cerebral blood volume (CBV) as a marker of regional cerebral perfusion pressure (CPP). In 37 patients with unilateral internal carotid or middle cerebral arterial (MCA) steno-occlusive disease and 8 normal controls, the baseline CBF (CBFb), CBV, OEF, cerebral oxygen metabolic rate (CMRO2), and CBF after acetazolamide loading in the anterior and posterior MCA territories were measured by 15O positron emission tomography. Paradoxical CBF reduction was found in 28 of 74 regions (18 of 37 patients) in the ipsilateral hemisphere. High CBFb (>47.6 mL/100 mL/min, n = 7) was associated with normal CBFb/CBV, increased CBV, decreased OEF, and normal CMRO2. Low CBFb (<31.8 mL/100 mL/min, n = 9) was associated with decreased CBFb/CBV, increased CBV, increased OEF, and decreased CMRO2. These findings demonstrated that paradoxical CBF reduction is not always associated with reduction of CPP, but partly includes high-CBFb regions with normal CPP, which has not been described in previous studies." @default.
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• W1997485760 date "2014-08-06" @default.
• W1997485760 modified "2023-10-17" @default.
• W1997485760 title "Paradoxical reduction of cerebral blood flow after acetazolamide loading: a hemodynamic and metabolic study with 15O PET" @default.
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• W1997485760 doi "https://doi.org/10.1007/s12264-013-1459-z" @default.
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