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Fig. 3A. —Bar graphs of cerebrospinal fluid hyperintensity (grading: = none [0], [UNK] = mild [1], = marked [2]) among 70 patients. Bar graphs show patients who received low (0.6) and high (>0.6) inspired oxygen fraction in basilar cisterns (A) and sulcar subarachnoid space (B). Most subjects in low inspired oxygen fraction group had no hyperintensity in basilar cisterns (A); however, in sulcal subarachnoid space (B) many had sufficient oxygen pressure to show hyperintensity even with this lesser degree of supplementation. In both regions, total percentage of mild and marked hyperintensity increased in patients with higher level of oxygen supplementation. (Basilar cisterns, p < 0.001; sulcal subarachnoid space, p = 0.03.)

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