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- W2890210856 abstract "Near infrared spectroscopy (NIRS) has been applied to measurements of cerebral blood oxygenation (CBO) in normal subjects and patients with various brain disorders including cerebrovascular diseases. However, it is not known whether NIRS allow us to measure CBO correctly in patients with abnormal cortices where optical characteristics such as optical pathlength (OP) may differ from those in normal cortex. In the present study, employing a time-resolved NIRS (TNIRS), we compared baseline hemoglobin (Hb) concentrations and OPs between normal and abnormal cortices in chronic stroke patients. We studied five patients with chronic cerebral infarction (two males, three females, age 59.0 ± 24.2 years) who were admitted to the University Hospital of Fukushima Prefectural Medical University. Employing TNIRS (TRS-20, Hamamatsu Photonics), we measured baseline Hb concentrations and OPs (760, 800, 830 nm) at various positions on the head. We observed that deoxy-Hb concentrations were significantly lower on the affected side (p < 0.01), and the tissue oxygen saturation was significantly higher than that on the affected side (p < 0.01), suggesting that oxygen consumption was reduced on the affected side. In addition, the OPs (760, 800 nm) were significantly longer on the affected side (p < 0.05); these changes might be caused by a possible increase of cerebrospinal fluid layer associated with brain tissue degeneration by ischemia. The present results suggest that NIRS should be performed on patients with abnormal cerebral cortices, giving special consideration to the possible difference in optical characteristics between normal and abnormal brain tissues." @default.
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- W2890210856 date "2018-01-01" @default.
- W2890210856 modified "2023-10-14" @default.
- W2890210856 title "Differences in Tissue Oxygenation, Perfusion and Optical Properties in Brain Areas Affected by Stroke: A Time-Resolved NIRS Study" @default.
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- W2890210856 doi "https://doi.org/10.1007/978-3-319-91287-5_11" @default.
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