Table 1.
PPI scoring algorithm
| Maximum stimulation intensity (mA) | Pupil reactivity | Generated PPI score |
|---|---|---|
| 10 | Pupil dilation is >13% during 10‐mA stimulation | 9 |
| 20 | Pupil dilation is >13% during 20‐mA stimulation | 8 |
| 30 | Pupil dilation is >13% during 30‐mA stimulation | 7 |
| 40 | Pupil dilation is >13% during 40‐mA stimulation | 6 |
| 50 | Pupil dilation is >13% during 50‐mA stimulation | 5 |
| 60 | Pupil dilation is >13% during 60‐mA stimulation | 4 |
| 60 | Pupil dilation is >13% during the second 60‐mA stimulation | 3 |
| 60 (5% < dilation < 13%) | Pupil dilation is >13% during the third 60‐mA stimulation | 2 |
| 60 (dilation ≤ 5%) | Pupil dilation is >13% during the last 60‐mA stimulation | 1 |
If the pupil dilation is over 20% during stimulation, the PPI score is increased with one point.