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. Author manuscript; available in PMC: 2016 Feb 22.
Published in final edited form as: Neurosurgery. 2009 Jun;64(6):1148–1154. doi: 10.1227/01.NEU.0000343542.61238.DF

FIGURE 2.

FIGURE 2

Changes in cerebral blood flow (CBF), CBF velocity (CBF-V), and their correlation during chemoregulation. A, CBF during changes in PCO2 in control animals (n = 9, filled circles), animals with vasospasm (n = 4, open squares), and after ischemia (n = 3, open triangles). B, CBF-V during changes in PCO2. C, correlation between CBF and CBF-V during changes in PCO2. Correlations above 0.8 are considered strong (dashed line). Only postischemic animals maintained a strong correlation of CBF-V and CBF throughout the wide range of PCO2 changes. Number of measurements: control animals, n = 153; vasospasm, n = 106; global ischemia, n = 43. Bars indicate mean ± SD.