Table 2.
Values of CMAP recorded from the supraspinatus muscle: two different procedures.
| n = 35 | (CMAP-C) SupSpi (Acc) |
(CMAP-D) SupSpi (Erb) |
P value | ||||
|---|---|---|---|---|---|---|---|
| Mean | SD | CoV | Mean | SD | CoV | ||
| onset latency (ms) | 2.8 | 0.4 | 0.14 | 1.9 | 0.2 | 0.11 | <0.01 |
| peak-to-peak amplitude (mV) | 10.3 | 5.0 | 0.49 | 10.3 | 4.8 | 0.47 | 0.99 |
| baseline-to-peak amplitude (mV) | 5.5 | 2.6 | 0.47 | 5.7 | 2.6 | 0.46 | 0.64 |
| duration (ms) | 11.3 | 1.4 | 0.12 | 11.1 | 1.6 | 0.14 | 0.42 |
| rise time (ms) | 2.0 | 0.7 | 0.35 | 2.0 | 0.7 | 0.35 | 0.99 |
Acc, accessory nerve; CMAP, compound muscle action potential; CoV, coefficient of variation; Erb, Erb’s point in the supraclavicular fossa; SD, standard deviation; SupSpi, supraspinatus muscle.