The characteristics of postcountershock pulseless electrical activity may indicate the outcome of CPR

摘要: Summary Objectives When ventricular fibrillation is cardioverted to pulseless electrical activity (PEA), PEA has been regarded as a non-resuscitatable rhythm. Yet, recent reports and our earlier observations suggested otherwise. We therefore investigated outcomes after postcountershock PEA, aimed develop scoring system for outcome classification at the onset of initial PEA. Methods Data from 215 domestic pigs were retrospectively reviewed. VF was induced untreated 7 min. Defibrillation attempted with up three 150 J biphasic shocks. Failing restore spontaneous circulation (ROSC), 1 min CPR preceded subsequent sequences shocks until animals resuscitated or total 15 min. Fifty-nine instances followed defibrillation, including 29 that attained ROSC. Results ROSC required shorter interval between first shock fewer prior demonstrated greater wavelet amplitude smaller QRS intervals, higher heart rates. Using Fisher's linear discriminant analysis, 79.3% 63.3% non-ROSC cases predicted correctly. A 71.2% all classified Conclusions Animals in which converted intervals had small analysis helpful predicting likelihood an individual animal presenting