Serial nerve conduction studies
Patient | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||||||||||||||||
Day of study | 7 | 40 | 72 | 7 | 13 | 36 | 3 | 38 | 73 | 7 | 28 | 46 | 6 | 23 | 88 | 5 | 15 | 32 | 1 | 13 | 56 | 1 | 8 | 35 |
Sensory studies | ||||||||||||||||||||||||
Median SNAP (μV) | 44 | 49 | 41 | 26 | 25 | 26 | 32 | 33 | 27 | 27 | 26 | 35 | 30 | 45 | 45 | 21 | 30 | 35 | 26 | 34 | 32 | 66 | 45 | 50 |
Ulnar SNAP (μV) | 32 | 40 | 30 | 33 | 21 | 29 | 32 | 28 | 27 | 26 | 23 | 28 | 22 | 31 | 42 | 39 | 39 | 31 | 24 | 33 | 32 | 47 | 37 | 40 |
Sural SNAP (μV) | 13 | 14 | 17 | 12 | 14 | 10 | 26 | 24 | 21 | 18 | 15 | 17 | 23 | 21 | 20 | 16 | 15 | 15 | 30 | 22 | 20 | 27 | 15 | 17 |
Motor studies | ||||||||||||||||||||||||
Median DML (ms) | 3.8 | 3.9 | 3.7 | 3.6 | 3.5 | 3.5 | 3.6 | 3.9 | 3.7 | 3.6 | 4.1 | 3.9 | 4.1 | 4.1 | 4.1 | 4.6 | 3.6 | 3.9 | 3.8 | 3.9 | 3.9 | 3.2 | 3.1 | 3.3 |
CMAP (mV) | 8.2 | 8.9 | 8.6 | 9.0 | 9.2 | 9.5 | 10.5 | 11.5 | 9.9 | 7.5 | 8.1 | 7.7 | 10.2 | 10.2 | 10.1 | 9.3 | 8.5 | 9.4 | 8.9 | 8.6 | 8.5 | 13.7 | 10.7 | 11.7 |
CV (m/s) | 53 | 52 | 55 | 57 | 56 | 55 | 51 | 53 | 53 | 56 | 56 | 57 | 55 | 59 | 59 | 53 | 51 | 54 | 53 | 53 | 54 | 62 | 59 | 60 |
Ulnar DML (ms) | 3.0 | 3.1 | 2.9 | 2.9 | 2.8 | 2.8 | 2.9 | 3.1 | 2.8 | 2.6 | 3.0 | 3.1 | 2.5 | 2.5 | 2.5 | 3.2 | 2.8 | 2.6 | 2.5 | 3.0 | 2.7 | 2.5 | 2.7 | 2.9 |
CMAP (mV) | 9.0 | 11.0 | 9.8 | 11.4 | 10.9 | 12.7 | 11.4 | 11.1 | 10.9 | 11.4 | 11.0 | 12.5 | 10.4 | 10.3 | 10.1 | 13.4 | 12.2 | 13.7 | 9.6 | 11.1 | 10.5 | 11.4 | 11.6 | 11.8 |
CV (m/s) | 56 | 50 | 58 | 56 | 59 | 58 | 58 | 55 | 59 | 56 | 51 | 50 | 61 | 58 | 58 | 53 | 57 | 57 | 59 | 56 | 58 | 58 | 60 | 66 |
Patient | 9 | 10 | 11 | 12 | 13 | 14 | 15 | ||||||||||||||||
Day of study | 7 | 15 | 30 | 60 | 5 | 16 | 49 | 5 | 18 | 25 | 85 | 6 | 14 | 30 | 76 | 7 | 14 | 48 | 1 | 9 | 3 | 28 | 44 |
Sensory studies | |||||||||||||||||||||||
Median SNAP (μV) | 15 | 11 | 11 | 19 | 16 | 25 | 29 | 18 | 23 | 24 | 39 | 21 | 13 | 24 | 34 | NA | 24 | 61 | 32 | 32 | 72 | 72 | 73 |
Ulnar SNAP (μV) | 12 | 9 | 14 | 12 | 17 | 22 | 26 | 10 | 15 | 17 | 21 | Ab | 11 | 20 | 33 | NA | 9 | 63 | 29 | 25 | 66 | 62 | 68 |
Sural SNAP (μV) | 16 | 14 | 11 | 12 | 10 | 15 | 14 | 14 | 10 | 10 | 16 | 22 | 16 | 19 | 26 | NA | 23 | 23 | 15 | 18 | 24 | 33 | 36 |
Motor studies | |||||||||||||||||||||||
Median DML (ms) | 3.9 | 3.8 | 4.0 | 3.8 | 4.2 | 3.9 | 3.9 | 3.5 | 3.2 | 3.0 | 3.4 | 3.2 | 3.4 | 4.2 | 3.7 | 2.9 | 2.7 | 3.7 | 3.8 | 3.9 | 3.4 | 3.7 | 3.9 |
CMAP (mV) | 8.7 | 8.1 | 8.0 | 7.4 | 8.5 | 11.5 | 8.0 | 9.6 | 9.5 | 10.6 | 10.2 | 5.3 | 10.0 | 10.0 | 9.2 | 7.7 | 6.5 | 7.9 | 7.5 | 7.9 | 9.7 | 9.9 | 11.4 |
CV (m/s) | 55 | 54 | 51 | 53 | 52 | 52 | 58 | 54 | 52 | 54 | 53 | 54 | 58 | 53 | 56 | 61 | 52 | 58 | 54 | 52 | 54 | 57 | 56 |
Ulnar DML (ms) | 2.4 | 2.7 | 2.9 | 2.7 | 2.9 | 2.9 | 3.0 | 2.6 | 2.5 | 2.4 | 2.8 | 3.0 | 2.9 | 3.0 | 3.0 | 2.5 | 2.0 | 3.0 | 2.8 | 3.0 | 2.4 | 2.5 | 2.7 |
CMAP (mV) | 9.9 | 11.1 | 12.8 | 11.2 | 7.9 | 10.5 | 9.2 | 10.1 | 11.7 | 11.6 | 12.1 | 3.8 | 10.0 | 9.6 | 11.0 | 4.2 | 1.8 | 9.4 | 6.6 | 9.2 | 9.5 | 9.5 | 9.6 |
CV (m/s) | 59 | 58 | 55 | 60 | 51 | 55 | 57 | 58 | 62 | 60 | 58 | 57 | 55 | 52 | 54 | 55 | 58 | 58 | 62 | 63 | 65 | 51 | 58 |
The abnormal values, as defined in methods, are indicated in bold. Significant serial changes are underscored.
Ab, absent; CMAP, compound muscle action potentials; CV, conduction velocity; DML, distal motor latency; NA, not applicable because of ICU artifacts; SNAP, sensory nerve action potential.