Table 3.
Description of airway parameters assessed.
| Legend | Cephalometric parameters | Description |
|---|---|---|
| O | Nasopharyngeal airway space (NAS) | Palatal pharyngeal distance on the line passing from PNS, parallel to FHP |
| P | Superior airway space (SAS) | Depth of oropharyngeal airway space from P to Mpw, parallel to FHP |
| Q | Posterior airway space (PAS) | Narrowest sagittal airway space between the base of tongue and the posterior pharyngeal wall, parallel to FHP |
| R | Hypopharyngeal airway space (HAS) | Depth of the airway space from vallecula (junction of epiglottis and base of tongue) to lower pharyngeal wall, parallel to FHP. |
| S | Hyoid distance | Perpendicular distance from hyoid bone to mandibular plane (MnP) |
| T | Length (Ln) of Soft Palate | Distance from PNS to P |
| U | Width (Wd) of Soft Palate | Maximum thickness of soft palate measured on line perpendicular to PNS-P line |
| V | Length of tongue (TGL) | Eb-Tt |
| W | Height of Tongue (TGH) | Maximum height of tongue along perpendicular line of Eb-Tt line to tongue dorsum |
| X | Hyoid plane angle (HP angle) | Angle formed by the intersection of HP with the C3-Rgn plane, representing angular position of the hyoid bone in relation to the mandible |