Table 1: Some maps of electrodes in the EGG recording.

AuthorsStomach positionElectrode positionCoordinatesNotes

Mintchev et al.
[21]
Cutaneous reference points Proximal electrode5 cm to the left of the xiphoid process on the costal margin
Commonly used
A row of 4 electrodes
(3 cm apart)
Between the first electrode and the junction of the mid-clavicular line with the right costal margin

Patterson et al.
[22]
Cutaneous reference pointsOne electrodes
Between the umbilicus and the xyphoid process
Alternative ones
Second electrode Left side of the abdomen, one-third of the distance from the ventral mid-line to the left axial mid-line, 1 cm below the lowest rib

Koch and Stern  
[23]
Sonography2 electrodes
Surface overlying the antropyloric axis calculated by ultrasonography
Best signal to noise ratio
The reference electrode Placed to form an equilateral triangle

Mirizzi and Scafoglieri [24]X-Ray/sonographyA daisy-chain of 6 electrodes
(3 bipolar channels)
Surface overlying the antro-pyloric axis calculated by ultrasonography/X-ray for at least one channel
Best signal to noise ratio

Chen et al. [25]Cutaneous reference pointsFive electrodes The main electrode located 2 cm above the mid-point between the xiphoid process and the umbilicus.
Three more electrodes were located on an upper 45 deg angle, with an additional electrode located 4 cm to the right of the central electrode.
Reference electrode on the right lower quadrant
Designed to pick-up propagation