Figure 1. (A) Distribution of regional cerebral blood flow (rCBF) values obtained from all patients (with and without ischemic electroencephalography [EEG] Delta) at the time of carotid occlusion. The occlusion rCBF values of the five patients exhibiting carotid cross-clamp-related ischemic EEG changes are shown separately as black bars. (B) The logistic regression curve with 90% confidence interval depicting the relation between rCBF and the probability of no carotid cross-clamp-related EEG change. The logistic regression curve is generated using the equation P = e sup (alpha + beta x)/(1 + e sup (alpha + beta x), where P is the probability of no EEG change, alpha and beta are the intercept and slope estimates from the logistic regression analysis, and x is rCBF.