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Fig. 3 | Annals of Intensive Care

Fig. 3

From: Prognostication after cardiac arrest: how EEG and evoked potentials may improve the challenge

Fig. 3

Somato-sensory evoked potential (SSEP) interpretation and prognostic value in comatose and DoC patients after CA. SSEPs five channels recording with N9 (proximal part of the median nerve) N13 (posterior columns of the spinal cord) P14 (cervico-medullar level), N18 (subcortical), N20 and P25 (primary somatosensory cortex). Erb-i Erb point ipsilateral, Erb-c Erb point contralatera, Fz Midline frontal electrod, CA-Cv6 cervical anterior and cervical posterior C6 electrode, Epc-Cc centro-parietal electrode contralateral to the stimulation (C’3 or C’4) and the shoulder contralateral to the stimulatio, C’3–C’4 centro-parietal electrode ipsilateral and contralateral to the stimulation. Only one side is here presented. Pre-requisite for ERP interpretation: N9 and N13 should be present. Use of neuromuscular blockage agents is recommended if artefacts limit the recording. Part A Shows that N20 and P25 are present with a high N20–P25 amplitude. Part B Shows that N20 and P25 are present with a low N20–P25 amplitude. Part C Shows an absence of N20 and P25, with preserved N9 and N13 responses

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