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Fig 2. Correlation between preoperative CBV and the increase in CBF immediately after CEA. Curved line indicates square function of the best fit. Open circle indicates patients without post-CEA hyperperfusion. Closed circle indicates patients with post-CEA hyperperfusion. The arrows indicate the patients who developed hyperperfusion syndrome. The horizontal dashed line indicates CBF increase of 100% (the definition of hyperperfusion). The vertical dashed line indicates the mean + 2 SD for CBV defined in healthy subjects.
