[Electrophysiological study of 16 patients with severe N-hexane neuropathy].

Objective: To observe electrophysiological changes of severe N-hexane neuropathy getting active therapies and discuss its prognosis.

Methods: A follow-up study involved 16 adult severe N-hexane neuropathy patients who got active therapies was performed. EMG in right muscle of thenar, tibial muscle, and vastus medialis, NCV in right median nerve, common peroneal nerve, and sural nerve were determined and analyzed before treatment and in the first, the third, the ninth, and the twenty-fourth month after treatment.

Results: The electrophysiology in severe N-hexane neuropathy patients showed that the voluntary potential during muscle relaxation increased by 25.0%; the motor unit potential time limit prolonged by 20.8%, and the amplitude increased by 12.5%, and multiphasic wave increased by 16.5% during mild contraction; the raise decreased by 25.0% during strong contraction. In control group, the MCV, SCV, SNAP, DML, and CMAP of median nerve were (54.63 +/- 5.33) m/s, (59.25 +/- 6.45) m/s, (26.53 +/- 6.32) microV, (3.96 +/- 0.65)ms, and (9.89 +/- 2.30) mV respectively, the MCV, CMAP, DML of common peroneal nerve were (48.49 +/- 3.25) m/s, (5.47 +/- 1.77) mV, (5.20 +/- 1.27) ms respectively, and the SCV, SNAP of sural nerve were (63.21 +/- 9.30) m/s, (4.63 +/- 1.29) microV respectively. Severe N-hexane neuropathy patients presented significantly different abnormalities in the NCV and EMG (P < 0.01). The MCV, SCV, SNAP, DML, CMAP of median nerve were (46.00 +/- 4.32) m/s, (40.66 +/- 2.65) m/s, (7.98 +/- 1.05) microV, (4.28 +/- 0.63) ms, and (6.32 +/- 1.54) mV respectively. The MCV, CMAP, DML of common peroneal nerve were (48.49 +/- 3.25) m/s, (3.21 +/- 1.99) mV, (7.32 +/- 1.65) ms respectively. The SCV, SNAP of sural nerve were (36.48 +/- 5.20) m/s, (2.15 +/- 1.22) microV respectively. These parameters gradually recovered to normal levels in 24 months after treatment.

Conclusion: The electrophysiological abnormalities in severe N-hexane neuropathy patients can restore after treatment, and clinical prognosis is good.