Parameter | 0 Points | 1 Point | 2 Points |
---|---|---|---|
1. Mouth opening | > 4 cm | < 4 cm | – |
2. Thyromental distance | > 6.5 cm | 6–6.5 cm | < 6.5 cm |
3. Mallampati class | I or II | III | IV |
4. Neck movement | > 90° | 80–90° | < 80° |
5. Underbite | Can protrude jaw | Cannot protrude jaw | – |
6. Body weight | < 90 kg | 90–110 kg | > 110 kg |
7. Previous intubation history | No difficulty | Unsure or unknown | Known difficulty |
Total score ≥ 4 predicts difficult intubation |