Skip to main content

Table 1 Evolution of sensory evoked potentials (SEPs) and sensory action potentials (SAPs) with disease course.

From: Sensory and motor neuronopathy in a patient with the A382P TDP-43 mutation

  RIGHT LEFT
Months 4-18 40 68-72 104 4-18 40 68-72 104
Median nerve         
SEPs         
N9 + +   - + -   -
N13 + - ND - - - ND -
P14 + +   - - -   -
N20 + +   + - -   -
SAP (μV) N > 8 μV 13.8 12.7 4.75 0 6.8 5 0 0
Tibial nerve         
SEPs         
N20 ND ND - - ND ND - -
P30    - -    - -
Sural nerve         
SAP (μV) N > 8 μV 7.8 ND 6.4 6.1 8 ND 6.4 3.8
  1. SEPs were recorded after stimulation of the median nerve at the wrist or the tibial nerve at the ankle, and SAPs were recorded in the median or sural nerves. N9, Erb point; N13, cervical spinal cord posterior horn; P14, gracilis and cuneatus nuclei; N20, parietal cortex, and P30, frontal cortex. '+' indicates a recorded potential and '-'an absent potential. ND: not done. SAPs were dromically registered with surface electrode in the ulnar nerve (head level, normal ≥ 8 μV) and antidromically in the sural nerve (foot level, normal ≥ 8 μV)