Table 2.
Comparison of morphological characteristics of the cVEMP, mVEMP and oVEMP between iRBD patients and controls.
| VEMP | Parameter | iRBD | Controls | p |
|---|---|---|---|---|
| cVEMP | p13 Onset (ms) | 8.95 ± 1.49 | 8.7 ± 1.62 | n.s. |
| p13 peak latency (ms) | 12.78 ± 1.22 | 12.62 ± 1.33 | n.s. | |
| n23 peak latency (ms) | 19.47 ± 2.5 | 19.75 ± 1.64 | n.s. | |
| p13/n23 amplitude | 0.66 ± 0.31 | 1.01 ± 0.36 | <0.0001 | |
| Mean EMG (μV) | 92.38 ± 41.62 | 110.6 ± 65.83 | n.s. | |
| Interpeak difference (ms) | 6.7 ± 2.2 | 7.83 ± 1.28 | 0.03 | |
| Amplitude asymmetry ratio | 24.08 ± 20.62 | 14.43 ± 11.34 | n.s. | |
| cVEMP score | 1.60 ± 1.03 | 0.09 ± 0.43 | 0.02 | |
| mVEMP | p11 Onset (ms) | 10.05 ± 0.92 | 9.18 ± 1.21 | <0.0001 |
| p11 peak latency (ms) | 12.84 ± 0.99 | 11.94 ± 1.01 | <0.0001 | |
| p11 amplitude | 0.34 ± 0.23 | 0.4 ± 0.15 | 0.001 | |
| Mean EMG (μV) | 75.96 ± 33.43 | 69.36 ± 30.65 | n.s. | |
| Interpeak difference (ms) | 8.46 ± 2.13 | 8.11 ± 1.81 | n.s. | |
| Amplitude asymmetry ratio | 16.09 ± 9.84 | 16.1 ± 15.81 | n.s. | |
| mVEMP score | 3.60 ± 4.02 | 0.73 ± 2.59 | 0.01 | |
| oVEMP | n10 Onset (ms) | 7.59 ± 1.24 | 7.43 ± 0.94 | n.s. |
| n10 peak latency (ms) | 9.5 ± 1.25 | 9.0 ± 1.06 | 0.02 | |
| n15 peak latency (ms) | 13.36 ± 1.67 | 13.27 ± 1.49 | n.s. | |
| n10/p15 amplitude | 0.49 ± 0.3 | 1.12 ± 0.37 | <0.0001 | |
| Mean EMG (μV) | 11.31 ± 5.02 | 9.66 ± 3.69 | n.s. | |
| Interpeak difference (ms) | 4.01 ± 1.16 | 4.27 ± 1.14 | n.s. | |
| Amplitude asymmetry ratio | 28.94 ± 17.83 | 25.11 ± 16.6 | n.s. | |
| oVEMP score | 2.15 ± 2.58 | 0.46 ± 0.21 | 0.01 |
Amplitude is expressed as ratio between the peak or peak-to peak amplitude (in μV) and background EMG activity (in μV). Statistics: Mann Whitney U-test. n.s, non-significant.