Table 1.
Results of Nerve Conduction Studies and Needle EMG in Patients with Fibromyalgia
| Nerves | Number and Percentage of Patients with EMG Abnormalities (Total N =17) | |
|---|---|---|
| Nerve Conduction Studies | ||
|
Sural nerve Latency: >3.6 ms (14 cm) |
2 | 12% |
|
Fibular nerve Conduction velocity: <39 m/sec; latency: >6 ms; amplitude: <1000 µV |
2 | 12% |
|
Hoffmann reflex Latency: >32 ms; left/right difference >2 ms |
7 | 41% |
|
Anal reflex Latency: >40 ms or >45 ms in women who had given vaginal birth; left/right difference > 6 ms; amplitude: left-right difference ≥500 µV |
16 | 94% |
|
Needle EMG ≥50% neurogenic motor unit potentials | ||
| L2 | 0 | 0% |
| L3 | 1 | 6% |
| L4 | 5 | 29% |
| L5 | 12 | 71% |
| S1 | 8 | 47% |
| S2 | 16 | 94% |
| S3-S4 | 13 | 76% |