Table 2.
Nerve conduction study findings of the four cerebrotendinous xanthomatosis patients
| Case | Median | Ulnar | Superficial radial | Peroneal | Tibial | Sural | H-reflex (N < 27.6) | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Motor | Sensory | Motor | Sensory | |||||||
| I-1 | R DL (ms) | 4.4 (N < 3.6) | 2.8 | 2.9 (N < 2.8) | 2.2 | 1.9 | 4.0 (N < 4.2) | 2.7 (N < 4.9) | Absent | 31.0 |
| L DL (ms) | 4.4 | 3.0 | 2.5 | 2.9 | 1.7 | 4.0 | 3.7 | Absent | 30.4 | |
| R CV (m/s) | 50 (N > 57.8) | 50 (N > 51.7) | 50 (N > 61.4) | 56 (N > 56.3) | 63 (N > 50) | 39 (N > 48.6) | 45 (N > 50.5) | Absent (N > 47.4) | ||
| L CV (m/s) | 49 | 47 | 54 | 49 | 71 | 42 | 40 | Absent | ||
| R Amp | 7.6 (N > 11.9) | 47 (N > 33) | 11 (N > 11.7) | 32 (N > 26.1) | 23 (N > 15) | 4.1 (N > 6.0) | 5.5 (N > 13.1) | Absent (N > 12.5) | ||
| L Amp | 7.1 | 21 | 8.1 | 38 | 33 | 4.5 | 9.6 | Absent | ||
| R F waves | 26.8-0.7 (N < 25.4) | 27.0-0.8 (N < 25.0) | 49.8-0.4 (N < 44.7) | 50.2-0.8 (N < 45.0) | ||||||
| L F waves | 27.9-0.8 | 26.4-1.0 | 47.4-0.4 | 50.4-0.8 | ||||||
| I-2 | R DL (ms) | 4.4 | 2.7 | 3.2 | 2.6 | 2.1 | 4.2 | 5.0 | Absent | 32.4 |
| L DL (ms) | 4.0 | 2.8 | 3.0 | 2.2 | 1.8 | 3.9 | 3.3 | Absent | 32.6 | |
| R CV (m/s) | 49 | 53 | 54 | 46 | 57 | 39 | 41 | Absent | ||
| L CV (m/s) | 51 | 50 | 51 | 54 | 67 | 41 | 40 | Absent | ||
| R Amp | 8.6 | 23 | 7.3 | 26 | 34 | 2.9 | 10.5 | Absent | ||
| L Amp | 9.2 | 31 | 8.8 | 13 | 60 | 3.8 | 6.7 | Absent | ||
| R F waves | 30.0-0.5 | 28.8-1.0 | 50.5-1.0 | 51.8-1.0 | ||||||
| L F waves | 28.3-1.0 | 28.4-1.0 | 50.1-0.6 | 53.9-1.0 | ||||||
| II-1 | R DL (ms) | 4.3 | 2.8 | 3.0 | 2.4 | 2.1 | Absent | 4.5 | Absent | 38.4 |
| L DL (ms) | 4.1 | 3.0 | 2.8 | 2.5 | 2.0 | 4.9 | 5.1 | Absent | 37.5 | |
| R CV (m/s) | 44 | 50 | 42 | 50 | 56 | Absent | 32 | Absent | ||
| L CV (m/s) | 46 | 47 | 43 | 48 | 60 | 30 | 34 | Absent | ||
| R Amp | 10.3 | 42 | 11.5 | 20 | 25 | Absent | 4.0 | Absent | ||
| L Amp | 11.7 | 47 | 9.9 | 29 | 32 | 2.4 | 2.6 | Absent | ||
| R F waves | 32.6-1.0 | 32.1-1.0 | Absent | 70.6-0.6 | ||||||
| L F waves | 30.4-0.9 | 30.4-1.0 | 79.2-0.2 | 75.7-0.9 | ||||||
| II-2 | R DL (ms) | 4.0 | 2.5 | 2.8 | 2.0 | 1.7 | 4.4 | 3.4 | Absent | 31.9 |
| L DL (ms) | 4.2 | 2.7 | 3.0 | 2.3 | 1.7 | 3.8 | 3.8 | Absent | 31.6 | |
| R CV (m/s) | 52 | 56 | 58 | 60 | 71 | 39 | 41 | Absent | ||
| L CV (m/s) | 52 | 52 | 50 | 53 | 71 | 43 | 39 | Absent | ||
| R Amp | 8.5 | 29 | 6.6 | 38 | 16 | 3.2 | 4.7 | Absent | ||
| L Amp | 7.4 | 50 | 6.7 | 40 | 29 | 4.7 | 2.0 | Absent | ||
| R F waves | 29.8-1.0 | 30.4-0.8 | 54.2-0.3 | 53.3-1.0 | ||||||
| L F waves | 29.6-1.0 | 31.6-0.9 | 50.9-0.8 | 56.5-0.9 | ||||||
N = normal; DL = distal latency; CV = conduction velocity; Amp = amplitude (mV in motor nerves and μV in sensory nerves); F waves = minimal latency-persistent rate; H-reflex = soleus H-reflex in minimal latency; AT = anterior tibialis; FDI = 1st dorsal interosseous muscle; R = right; L = left