Figure 1From: A Cerebral Recovery Index (CRI) for early prognosis in patients after cardiac arrestExample of two signals with different variance in amplitude. The signal in (A) shows two short periods with high amplitude on a zero background; the variance in amplitude in this signal is relatively high, whereas the signal in (B) has a more-regular or constant amplitude. The signal in A can be compared with an EEG showing a burst-suppression pattern, whereas the signal in B can be compared with an EEG with continuous amplitude. This is expressed in the regularity index (compare Equation 2 and Figure 2).Back to article page