Initial positive component of SSEPs
| Recording level | No of patients | Amplitude | Area | Latency | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean (range) μV | Mean (SD) % | p Value | Mean (range) μV×ms | Mean (SD) % | p Value | Mean (SD) ms | Difference ms | p Value | |||||
| +2 | 17 | 1.7 (0.1-5.9) | 75 (30) | 11.0 (0.1-127) | 183 (206) | 6.60 (1.89) | |||||||
| 0.0003 | 0.0003 | 0.26 (0.19) | |||||||||||
| +1 | 35 | 3.4 (0.2-14.4) | 143 (76) | 17.6 (0.1-375) | 446 (589) | 6.28 (2.07) | <0.02 | ||||||
| NS | <0.04 | 0.61 (0.48) | |||||||||||
| 0 | 42 | 4.5 (0.2-30.9) | 150 (73) | 22.0 (0.1-683) | 293 (226) | 5.55 (1.94) | NS | ||||||
| 0.0004 | <0.0001 | 0.63 (0.34) | |||||||||||
| -1 | 402-150 | 3.1 (0.2-16.8) | 115 (71) | 4.9 (0.1-90.8) | 123 (96) | 4.91 (1.81) | <0.0001 | ||||||
| NS | NS | 0.33 (0.09) | |||||||||||
| -2 | 42 | 3.6 (0.1-23.1) | 100 | 4.7 (0.1-80.7) | 100 | 4.59 (1.77) | NS | ||||||
| NS | NS | 0.34 (0.13) | |||||||||||
| -3 | 24 | 3.2 (0.3-20.6) | 101 (29) | 6.8 (0.1-103) | 103 (35) | 4.67 (1.55) | |||||||
↵2-150 In two patients the electrode placement was unsuccessful at the -1 level.