Table 2.

Salford Mucopolysaccharidosis Airway Score (SMAS).

S. No.	Parameter	Measure	Score	Final Score
	MPS Type
1	Mouth opening	>5 cm	0
		4–5 cm	1
		3–4 cm	2
		<3 cm	3
2	Teeth protrusion on clinical exam and scans	Non-protruding	0
		Mild	1
		Moderate	2
		Severe	3
3	Cervical spine mobility, stability	unrestricted	0
		60–90 degrees flexion	1
		30–60 degrees flexion	2
		<30 degrees or unstable	3
4	Tongue bulkiness on examination and Scan	Normal	0
		Mild (filling less than 1/3 of floor mouth)	1
		Moderate (filling 1/3 to 1/2 of oral cavity)	2
		Severe (filling more than 1/2 of oral cavity)	3
5	Modified Mallampati grade [11]	1	0
		2	1
		3	2
		4	3
6	Thyromental distance	>6 cm	0
		5–6 cm	1
		4–5 cm	2
		<4 cm	3
7	Larynx height epiglottis to soft palate	>4 cm	0
		3–4 cm	1
		2–3 cm	2
		<2 cm	3
8	Epiglottis bulkiness	Normal (filling less than 1/3 of oropharynx)	0
		Mild (filling 1/3 to 1/2 of oropharynx)	1
		Moderate (filling 1/2 to complete oropharynx)	2
		Severe (Filling entire oropharynx)	3
9	Supraglottis bulkiness	Normal (filling less than 1/3 of laryngopharynx)	0
		Mild (filling 1/3 to 1/2 of laryngopharynx)	1
		Moderate (filling ½ to complete laryngopharynx)	2
		Severe (filling entire oropharynx)	3
10	Glottis bulkiness	Normal (filling less than 1/3 of glottis)	0
		Mild (filling 1/3 to 1/2 of glottis)	1
		Moderate (filling 1/2 to complete glottis)	2
		Severe (filling entire glottis)	3
11	Subglottis diameter at cricoid level	>7 mm	0
		6–7 mm	1
		5–6 mm	2
		<5 mm	3
12	Tracheomalacia or tracheal stenosis (degree of narrowing)	No narrowing	0
		50–75% lumen narrowing	1
		75–99% lumen narrowing	2
		100% lumen narrowing	3
13	Tracheal tortuosity	None	0
		present	3
14	FEV1%	>80%	0
		60–79%	1
		40–59%	2
		<40%	3
15	FVC%	>80%	0
		60–79%	1
		40–59%	2
		<40%	3