Fig. 1.

Selected NCS and turn amplitude analysis. Amplitude is measured peak-to-peak. Motor NCS: gain = 5 mV/D, LFF = 2 Hz, HFF = 10 kHz; sensory NCS: gain =20 μV/D, LFF = 20 Hz, HFF = 2 kHz. A, amplitude; DL, distal latency; CV, conduction velocity. Values abnormal according to our laboratory reference normative values are marked in bold. Patient #1 affected by CIPM. Nerve conduction studies and turns/amplitude analysis are reported. Motor NCS of right peroneus (A = 2.1 mV, DL = 4.19 m, CV = 41.9m/s), left tibialis (A = 3.8 mV, DL = 4.4 ms, CV = 44.9 m/s), and left ulnar nerves (A = 9.2 mV, DL = 2.8 ms, CV = 55.7 m/s). Antidromic sensory NCS of both sural nerves (left: A = 4.3 μV, DL = 2.56 ms, CV = 54.7 m/s; right: A = 2.2 μV, DL = 2.62 ms, CV = 45.8 m/s) and left radial (A = 19.6 μV, DL = 2.33 ms, CV = 51.5 m/s), median (A = 22.8 μV, DL = 2.85 ms, CV = 49.1 m/s), and ulnar (A = 14.2 μV, DL = 2.6 ms, CV = 48.1 m/s) nerves are reported. Turns amplitude analysis of left tibialis anterior is shown in the last box. Patient #6 affected by AIDP. Motor NCS of right peroneus (A = 4.6 mV, DL = 8.74 ms, CV = 38.1 m/s), right tibialis (A = 9.7 mV, DL = 6.0 ms, CV = 38.9 m/s), left tibialis (A = 14.9 mV, DL = 5.49 ms, CV = 39.3 m/s), and left ulnar (A = 13.2mV, DL = 3.37 ms, CV = 47.0 m/s) nerves