G1 active recording electrode
G1: posteroinferior to the lateral malleolus
Place G1 posteroinferior to the lateral malleolus.
Table 2 · p.373 ↗
Sensory study
Lower limb
Sural sensory nerve conduction study
Place G1 posteroinferior to the lateral malleolus and stimulate distally from the midline or slightly lateral calf.
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: midline or slightly lateral calf
Stimulate at the midline or slightly lateral calf, 14 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 posterolateral calf region, not a single mandatory point.
Table 2 · p.373 ↗02 · Reference values
Adult normal limits
| Measure | Reference limit | Basis |
|---|---|---|
| SNAP onset-to-peak | ≥4 µV | 3rd percentile lower limit |
| SNAP peak-to-peak | ≥4 µV | 3rd percentile lower limit |
| Onset latency | ≤3.6 ms | 97th percentile upper limit |
| Peak latency | ≤4.5 ms | 97th percentile upper limit |
| Conduction velocity | ≥40 m/s | Published 3rd percentile |
03 · Technique
Acquisition conditions
Fixed distance
G1 to stimulation site: 14 cm
Sensitivity
2–5 µV/div
Filter
20 Hz–2 kHz
Sweep
1 ms/div
Temperature
Maintain dorsal foot skin temperature >31°C
Ground
Place the ground between the stimulating and recording electrodes
Primary evidence
Method-matched AANEM reference data
Adult antidromic sural sensory reference values.