Table 3 Correlations between blood lead level and electrophysiological parameters, motor evoked potentials and indices of nerve excitability test
From: Nerve excitability test and lead toxicity: a case-control study
Parameters | Controls (± SD) | Workers (± SD) | p value | |
|---|---|---|---|---|
NCS | Distal latency (ms) | 3.06 (± 0.27) | 3.69 (± 0.64) | 0.002 |
Distal CMAP amplitude (mV) | 7.55 (± 0.65) | 6.63 (± 1.97) | 0.108 | |
MNCV (m/s) | 58.14 (± 6.35) | 55.66 (± 2.72) | 0.037 | |
Proximal latency (ms)#1 | 10.44 (± 0.53) | 10.76 (± 1.15) | 0.446 | |
MEP | Latency (ms) | 17.44 (± 9.73) | 23.47 (± 1.80) | 0.000 |
NET | Stimulus-Response curve | |||
Stim. 50% max resp. (mA) | 3.66 (± 2.52) | 4.96 (± 1.08) | 0.001 | |
SR slope | 7.45 (± 5.47) | 5.13 (± 1.61) | 0.003 | |
Peak response (mV) | 2.03 (± 1.05) | 2.93 (± 0.91) | 0.014 | |
Threshold electrotonus | ||||
S1 (TEh 20–40 ms) | -90.63 (± 48.03) | -96.29 (± 8.38) | 0.046 | |
S3 (TEh 90–100 ms) | -119.22 (± 64.85) | -132.59 (± 18.30) | 0.027 | |