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Annals of Intensive Care
Fig. 3 | Annals of Intensive Care

Fig. 3

From: Early impairment of intracranial conduction time predicts mortality in deeply sedated critically ill patients: a prospective observational pilot study

Fig. 3

Schematic representation of brainstem auditory evoked potentials (BAEP) responses localizations on a brain MRI (a) and typical examples of their normal wave forms as well as recording montage (b). BAEP elicited by auditory click (100-µs 80-dB) applied to one ear, with a (−20 dB) masking of the contralateral ear by “white noise.” The recurrence frequency was 19.3 Hz (bandpass, 150–1500 Hz; sweep time, 10 ms). BAEP were picked up in Fz. with the reference electrode placed at the earlobe ipsilateral to the stimulated ear (Fz—A1 or A2). Two sets of 2000 sweeps were averaged. The I–III IPL represents the peripheral conduction time of the auditory pathway, when the III–V IPL represents the intrapontine conduction time (IPCT)

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