G1 active recording electrode
G1: along the line toward the radial artery
Place G1 along the line toward the radial artery.
Table 2 · p.373 ↗
Sensory study
Upper limb
Lateral antebrachial cutaneous sensory nerve conduction study
Record along the line toward the radial artery and stimulate just lateral to the distal biceps tendon.
01 · Placement
G1, G2, stimulation and ground landmarks
G2 reference electrode
G2: 3 cm distal bar electrode
Use a bar electrode with G2 3 cm distal to G1.
Table 2 · p.373 ↗Stimulation site
Stimulation: just lateral to the distal biceps tendon
Stimulate just lateral to the distal biceps tendon, 10 cm from G1.
Table 2 · p.373 ↗Ground region
Ground electrode region
AANEM places the ground between the stimulating and recording electrodes. The model shows a usable lateral forearm region, not a single mandatory point.
Table 2 · p.373 ↗02 · Reference values
Adult normal limits
| Measure | Reference limit | Basis |
|---|---|---|
| SNAP onset-to-peak | ≥5 µV | 3rd percentile lower limit |
| SNAP peak-to-peak | ≥6 µV | 3rd percentile lower limit |
| Onset latency | ≤2.5 ms | 97th percentile upper limit |
03 · Technique
Acquisition conditions
Fixed distance
G1 to stimulation site: 10 cm
Sensitivity
10 µV/div
Filter
20 Hz–2 kHz
Sweep
1 ms/div
Temperature
Maintain dorsal hand skin temperature >32°C
Ground
Place the ground between the stimulating and recording electrodes
Primary evidence
Method-matched AANEM reference data
Adult lateral antebrachial cutaneous sensory reference values.