Figure 4 .

Median-nerve somatosensory evoked potentials (SEPs) were obtained respectively two (A) and 12 (B) days after admission to the ICU. In the first recording, the early cortical component (N20-P25) was present in both hemispheres with reduced amplitude and increased central conduction time; middle SEP components were not present. In the second recording, cortical SEP components showed an increase in amplitude associated with the presence of middle SEP components. Sensitivity: 5μV/div; sweep time: 10 ms/div.