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Table 2 F wave parameters and split hand index in patients with ALS and controls

From: Evaluation of F wave and split hand index in patients with amyotrophic lateral sclerosis

Parameter

Controls n = 22

ALS patients n = 22

P value

F min. latency (ms)

25.37 ± 2.17

28.19 ± 1.53

< 0.001

F mean latency (ms)

26.95 ± 2.21

29.74 ± 2.24

< 0.001

F max. latency (ms)

28.18 ± 2.48

32.33 ± 2.39

< 0.001

F chronodispersion (ms)

2.8 ± 0.78

4.13 ± 1.75

0.002

F persistence (%)

99.0 ± 1.93

85.42 ± 16.98

< 0.001

F max. amplitude (μV)

700.45 ± 187.98

673.85 ± 230.85

0.0267

F mean amplitude (μV)

552.44 ± 156.44

475.47 ± 209.26

0.018

F median amplitude (μV)

651.3 ± 176.35

507.46 ± 193.53

0.004

F wave duration (ms)

9.41 ± 1.01

10.39 ± 1.28

0.001

FWCV (m/s)

63.5 ± 3.74

57.08 ± 6.40

< 0.001

Giant F wave (n)

0.0 ± 0.0

1.5 ± 3.08

0.001

F/M Max AR (%)

5.24 ± 1.08

8.11 ± 1.71

< 0.001

F/M mean AR (%)

4.18 ± 0.76

5.37 ± 2.11

0.034

F/M median AR (%)

4.76 ± 0.65

7.33 ± 4.78

0.006

IRN (%)

0.0 ± 0.0

6.87 ± 16.77

< 0.001

IRF

0.0 ± 0.0

4.659 ± 10.12

< 0.001

CMAP amplitude (mV)

 APB muscle

11.9 ± 2.09

6.17 ± 2.27

< 0.001

 ADM muscle

12.52 ± 2.05

9.62 ± 1.67

< 0.001

 FDI muscle

9.97 ± 1.02

5.09 ± 0.95

< 0.001

ABP/ADM amplitude ratio

1.21 ± 0.33

1.03 ± 0.51

0.001

FDI/ADM amplitude ratio

1.31 ± 0.49

1.29 ± 0.66

0.609

Split hand index

15.35 ± 5.36

10.28 ± 6.82

0.004

  1. ALS amyotrophic lateral sclerosis, min minimum, max maximum, FWCV F wave conduction velocity, AR amplitude ratio, IRN index repeating neuron, IRF index repeater F wave, CMAP compound muscle action potential, APB abductor pollicis brevis, ADM abductor digit minimi, FDI first dorsal interosseous