The document provides instructions for performing the 10-20 procedure for electrode placement in sleep studies. It describes locating four anatomical landmarks - nasion, inion, right and left pre-auricular points. Distances are then measured between the landmarks and specific percentages of those distances are used to mark electrode positions including Fp1, Fp2, F3, F4, C3, C4, P3, P4, O1, O2, Fz, Cz and Oz. The electrodes are placed at the marked positions on the skull.

1. Review on the 10-20 for Sleep
PSG 164
Michelle Sartelle, RPSGT, RRT, RST

2. The 10-20 procedure
 Locate the landmarks
 Measure the distances
 Mark the positions
 Prepare the site
 Apply the electrodes

3. 4 Anatomical Landmarks of the skull
1. Nasion
2. Inion
3. Right Pre-Auricular
4. Left Pre- Auricular

4. 4 landmarks

5. Example of how to mark your lines:
Always go perpendicular to the tape measure
31

6. After you make your second mark for an
electrode ..it will look like this
Your electrode will go in the middle

7. 4 Measurements for sleep 10/20
 Nasion to inion
 Preauricular to preauricular
 Circumference
 Parasaggital

8. 1. Nasion to inion
 10% up from nasion-FPZ
 10% up from inion-OZ
 50 % of distance-CZ

9. 2. Preauricular to preauricular
Make sure this goes thru the first mark for CZ
50% is the second mark for CZ
20% from CZ on each side for C3 and C4

10. 3. Circumference
 50% for 0Z
 5% for O1, O2 and FP 1 ,FP2
5 5
O1 % Oz % O2
FP1 FPZ FP2

11. 4. Parasagittal
 FP1 to O1
 50% for C3
 50% from C3 to FP1 for F3
 FP2 to O2
 50 % for C4
 50% from C4 to FP2 for F4