Late heartbeat-evoked potentials are associated with survival after cardiac arrest.
RATIONALE
Cardiac arrest (CA) is a serious condition characterized by high mortality rates, even after initial successful resuscitation, mainly due to neurological damage. Whether brain-heart communication is associated with outcome after CA is unknown. Heartbeat-evoked brain potentials (HEPs) represent neurophysiological indicators of brain-heart communication. The aim of this study was to address the association between HEPs and survival after CA.


METHODS
HEPs were calculated from resting EEG/ECG in 55 CA patients 24 h after resuscitation. All patients were treated with targeted temperature management and a standardized sedation protocol during assessment. We investigated the association between HEP amplitude (180-320 ms, 455-595 ms, 860-1000 ms) and 6-month survival.


RESULTS
Twenty-five of 55 patients (45%) were still alive at 6-month follow-up. Survivors showed a higher HEP amplitude at frontopolar and frontal electrodes in the late HEP interval than non-survivors. This effect remained significant after controlling for between-group differences in terms of age, Fentanyl dose, and time lag between resuscitation and EEG assessment. There were no group differences in heart rate or heart rate variability.


CONCLUSION
Brain-heart communication, as reflected by HEPs, is associated with survival after CA. Future studies should address the brain-heart axis in CA.
['Schulz|André|A|', 'Stammet|Pascal|P|', 'Dierolf|Angelika M|AM|', 'Vögele|Claus|C|', 'Beyenburg|Stefan|S|', 'Werer|Christophe|C|', 'Devaux|Yvan|Y|']
D000328:Adult D000368:Aged D004562:Electrocardiography D004569:Electroencephalography D005071:Evoked Potentials D005260:Female D006323:Heart Arrest D006339:Heart Rate D006801:Humans D007036:Hypothermia, Induced D008297:Male D008875:Middle Aged D011237:Predictive Value of Tests D012042:Registries D012189:Retrospective Studies
Cardiac arrest Targeted temperature management Sedation Brain-heart interaction Interoception Neurological outcome Prognostication Visceral-afferent signals