Six hundred and nine patients diagnosed clinically as brain dead were studied; 326 had final cardiac asystole while still being ventilated. The median time in hospital before the heart finally stopped was 3–4 days, with 30–40 hours on the ventilator.85 A singular ventricular escape beat occurring in the midst of prolonged asystole may prevent or delay both the tonic fit and the isoelectric pattern.86 Source: Generalized Epilepsy, Atlas of Pediatric EEG Citation: Laoprasert P. Atlas of Pediatric EEG; 2011 Available at: http://neurology.mhmedical.com/DownloadImage.aspx?image=/data/books/1042/lao001_fig_08-53.gif&sec=59079914&BookID=1042&ChapterSecID=59078730&imagename= Accessed: November 07, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved