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Somatosensory evoked potentials. (A) In comatose survivors after cardiac arrest, somatosensory evoked potentials are elicited by transcutaneous electrical stimulation applied to the median nerve and then recorded at Erb's point (N9), the cervical medulla (N13) and the controlateral cortex (N20). (B) Example of present N20 cortical response (C3′) in two comatose patients after cardiac arrest. (C) Example of absent N20 cortical response (C3′) in two comatose patients after cardiac arrest.
