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

Abu-Hegazy, Mohammad; Elmoungi, Azza; Eltantawi, Eman; Esmael, Ahmed

doi:10.1186/s41983-021-00374-5

The Egyptian Journal of Neurology, Psychiatry and Neurosurgery

Table 4 SSEP in different myoclonic subgroups

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

	Juvenile myoclonic epilepsy (N = 19)	Progressive myoclonic epilepsy (N = 10)	Secondary (post-hypoxic) Lance–Adams syndrome (N = 2)	Secondary (post-ischemic stroke myoclonus) (N = 2)	Secondary (hepatic) (N = 6)	Secondary (chronic kidney) (N = 6)	Drug-induced myoclonus (N = 5)	P
Age	31.9 ± 12.5	34.4 ± 11.6	61 ± 4.5	56 ± 3.4	56.7 ± 5.9	59.3 ± 7.4	28.9 ± 10.9	0.13
N20 amplitude	1.9 ± 0.7	2.1 ± 0.6	0.9 ± 0.5	2.8 ± 0.7	1.9 ± 0.6	1.9 ± 0.8	1.9 ± 0.9	0.63
N20 latency	23.3 ± .18	23.2 ± .12	23 ± 2.4	23.4 ± 1.6	23.2 ± 0.1	23.3 ± 0.1	23.3 ± 0.1	0.22
P24 amplitude	2.6 ± 1.1	20.9 ± 27.5	10.6 ± 1.2	8.5 ± 0.6	7.8 ± 2.2	6.7 ± 1.6	6.9 ± 1.6	0.04*
P24 latency	25.2 ± 0.2	24.9 ± 0.55	24.4 ± 2.3	24.8 ± 1.7	25.5 ± 0.8	24.8 ± 0.6	24.9 ± 0.2	0.06
N33 amplitude	3.7 ± 1.4	24.5 ± 30.8	11.4 ± 1.3	12.5 ± 0.4	9.5 ± 2.1	8.8 ± 1.6	8.2 ± 2.1	0.04*
N33 latency	34.03 ± 0.1	33.54 ± 0.18	33.3 ± 1.8	35.6 ± 1.9	34.1 ± 0.6	34.1 ± 0.6	34 ± 0.21	0.14
P24–N33 complex amplitude	6.2 ± 2.5	45.4 ± 58.3	22.1 ± 1.2	21 ± 0.8	17.7 ± 4	15.6 ± 2.9	15.1 ± 3.6	0.04*
N20 amplitude	1.9 ± 0.7	2.01 ± 0.7	1.9 ± 0.5	1 ± 0.3	1.8 ± 0.6	2.3 ± 0.9	1.8 ± 0.8	0.7
N20 latency	23.2 ± 0.14	23.1 ± 0.11	23.6 ± 3.2	23.4 ± 0.7	23.7 ± 0.2	23.3 ± 0.1	23.2 ± 0.1	0.29
P24 amplitude	2.9 ± 1.2	19.4 ± 22.5	7.2 ± 0.7	8.4 ± 0.5	7.4 ± 2.9	7.1 ± 2.6	8.1 ± 2.1	0.02*
P24 latency	25.1 ± 0.1	25.2 ± 0.9	24.9 ± 3.2	25.1 ± 2.9	24.9 ± 0.3	25 ± 0.2	24.7 ± 0.2	0.39
N33 amplitude	4.1 ± 1.2	23.5 ± 26.5	9.6 ± 0.9	10.6 ± 0.8	9.1 ± 2.8	8.5 ± 2.8	10.1 ± 2.7	0.02*
N33 latency	34.1 ± 0.3	33.6 ± 0.57	33.70 ± 3.5	33.8 ± 2.2	34.3 ± .41	33.7 ± 0.4	34 ± 0.7	0.07
P24–N33 complex amplitude	6.9 ± 2.3	42.9 ± 48.9	16.8 ± 2.4	19 ± 2.3	16.5 ± 5	15.6 ± 5.3	18.2 ± 4.2	0.02*
EGG spike/polyspike wave complex	12 (63.2%)	10 (100%)	2 (100%)	2 (100%)	4 (66.6%)	4 (66.6%)	2 (40%)	0.02*

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