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Table 3 Simplified Airway Risk Index (SARI)

From: Neuroplasticity induced by general anaesthesia: study protocol for a randomised cross-over clinical trial exploring the effects of sevoflurane and propofol on the brain – A 3-T magnetic resonance imaging study of healthy volunteers

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