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Table 5 SSEPs findings in different myoclonus subtypes according to anatomical classification

From: Electrophysiological characteristics and anatomical differentiation of epileptic and non-epileptic myoclonus

 

Cortical (N = 10)

Subcortical (N = 12)

Cortical–subcortical (N = 28)

Control (N = 30)

P

P1

P1

P3

Right median nerve

 N20 amplitude

2.1 ± 0.6

1.9 ± 0.7

1.9 ± 0.8

2.2 ± 0.8

0.62

0.86

0.25

0.25

 N20 latency

23.2 ± 0.1

23.2 ± 0.1

23.3 ± 0.2

23.3 ± 0.2

0.28

0.08

0.536

0.96

 P24 amplitude

20.9 ± 27.5

7.2 ± 1.9

3.29 ± 2.4

2.7 ± 0.8

0.005*

 < 0.001*

 < 0.001*

0.004*

 P24 latency

24.8 ± 0.6

25.2 ± 0.8

25.1 ± 0.3

25.2 ± 0.2

0.3

0.14

0.864

0.61

 N33 amplitude

24.5 ± 30.8

9.7 ± 1.8

4.4 ± 2.9

3.9 ± 1.3

0.004*

0.006*

 < 0.001*

0.005*

 N33 latency

33.5 ± 0.2

34.1 ± 0.5

34.1 ± 0.4

34.1 ± 0.2

0.003*

 < 0.001*

0.89

0.87

 P24–N33 complex amp

45.4 ± 58.3

16.5 ± 3.4

7.7 ± 5.2

5.8 ± 1.9

0.004*

 < 0.001*

 < 0.001*

0.002*

Left median nerve

 N20 amplitude

2 ± 0.7

2.1 ± 0.7

1.9 ± 0.7

2.1 ± 0.7

0.76

0.89

0.25

0.48

 N20 latency

23.2 ± 0.1

23.3 ± 0.1

23.2 ± 0.1

23.2 ± 0.2

0.05

0.14

0.54

0.86

 P24 amplitude

19.4 ± 22.5

7.3 ± 2.3

3.3 ± 1.9

2.4 ± 0.9

0.002*

0.041*

 < 0.001*

0.034*

 P24 latency

25.2 ± 0.9

24.9 ± 0.2

25.1 ± 0.1

25.2 ± 0.2

0.39

0.83

0.86

0.11

 N33 amplitude

23.5 ± 26.5

8.8 ± 2.69

4.6 ± 2.2

3.5 ± 1.3

0.002*

0.041*

 < 0.001*

0.029*

 N33 latency

33.6 ± 0.6

33.97 ± 0.52

34.1 ± 0.3

34.1 ± 0.2

0.104

0.040*

0.895

0.746

 P24–N33 complex amp

42.9 ± 49

16.1 ± 4.9

7.9 ± 4

5.7 ± 2

0.002*

0.040*

 < 0.001*

0.024*

 EEG Spike/polyspike wave complex

10 (100%)

4 (33.3%)

18 (64.3%)

0

0.005*

 < 0.001

 < 0.001

 < 0.001

  1. P: all patients according to anatomical subtypes vs control (one-way Anova test); P1: cortical myoclonus vs control (Student t-test); P2: subcortical myoclonus vs control (Student t-test); P3: cortical–subcortical myoclonus vs control (Student t-test)