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. 2020 Aug 14;37(17):1854–1863. doi: 10.1089/neu.2020.7024

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Copyright 2020, Mary Ann Liebert, Inc., publishers

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FIG. 4. — Cohort histograms: % time with combined PRx and PbtO₂ derangements. (A) Histogram of % time with PRx >0 and PbtO₂ < 20 mm Hg. (B) Histogram of % time with PRx >0 and PbtO₂ > 20 mm Hg. (C) Histogram of % time with PRx < below 0 and PbtO₂ < 20 mm Hg. (D) Histogram of % time with PRx > +0.25 and PbtO₂ < 20 mm Hg. (E) Histogram of % time with PRx > +0.25 and PbtO₂ > 20 mm Hg. (F) Histogram of % time with PRx < +0.35 and PbtO₂ < 20 mm Hg. Mean and % time values were derived across the patient's entire recording period. Frequency, number of patients; ICP, intracranial pressure; MAP, mean arterial pressure; PbtO₂, brain tissue oxygen; PRx, pressure reactivity index (correlation between slow waves of ICP and MAP).