Table 1

The top panel displays the mean (SD) CMAP amplitude and change in duration normalised to the values from wrist stimulation in groups of patients with ALS, MMN with clinically unaffected ulnar nerves (MMN U), and controls. The bottom panel displays the mean (SD) percentage segmental change in CMAP amplitude and duration in the five segments studied in the ulnar nerve in the same groups of patients.

Mean (SD) CMAP parameters normalised to those from the wrist
Below elbowAbove elbowAxillaErb’s pointC8/T1 root
Amplitude (%)
    Controls95.6 (4.2)91.9 (6.9)86.7 (7.9)78.9 (6.7)72.9 (9.4)
    ALS89.6 (8.2)81.9 (10.9)86.1 (9.5)75.5 (13.4)66.9 (13.5)
    MMN U94.5 (5.4)92.5 (11.5)86.1 (12.4)77.6 (12.9)72.0 (19.7)
Duration change (%)
    Controls3.0 (6.2)4.5 (8.4)4.7 (9.3)9.7 (11.9)15.4 (13.7)
    ALS6.2 (8.7)9.3 (12.3)10.4 (12.2)18.1 (17.1)21.2 (20.7)
    MMN U1.3 (9.1)4.3 (9.9)5.3 (10.5)22.9 (23.9)27.9 (33.2)
Percentage segmental change (SD) in CMAP parameters
Below elbow-wristAcross elbowAxilla- above elbowErb’s point-axillaC8/T1 root-Erb’s point
Amplitude (%)
    Controls4.4 (4.2)4.0 (4.1)5.6 (6.5)8.8 (6.1)7.7 (7.9)
    ALS10.4 (8.2)3.9 (6.9)4.6 (9.2)7.7 (11.0)11.0 (12.2)
    MMN U5.5 (5.4)2.3 (8.0)6.8 (8.6)9.4 (11.1)8.5 (13.0)
Duration (%)
    Controls3.0 (6.2)1.4 (3.1)0.3 (7.4)4.9 (6.7)5.2 (5.5)
    ALS6.2 (8.7)2.8 (7.8)1.3 (7.1)7.1 (10.9)2.8 (11.1)
    MMN U1.3 (9.1)5.1 (3.1)1.0 (5.0)16.2 (15.3)3.1 (9.2)