Table 1.
Quantitative swallowing measures of timing, displacement, and area ratio.
| Measure | Description |
|---|---|
| Timing (sec) | |
| Hdur | Duration of maximum hyoid displacement |
| PESop | Pharyngoesophageal segment (PES) opening duration |
| Airwaycl | Onset and completion of supraglottic closure |
| Airwaydur | Duration of airway closure |
| BP1AEcl | Time from airway closure to bolus entering PES |
| TPT | Onset of swallow (first movement past the posterior nasal spine) to clearance of the bolus tail through the PES: total pharyngeal transit time. |
| ETT | Entrance of the bolus through the PES to clearance through the lower esophageal sphincter (LES): esophageal transit time |
| Displacement (cm) | |
| PESmax | The maximum distension of the PES |
| Hmax | Change in hyoid position from rest to maximum anterior-posterior displacement |
| HLmax | Difference in distance between hyoid and larynx at rest and when maximally approximated during swallow |
| Area (cm2) | |
| PAhold | Area of pharynx at rest |
| Ratio (area:area) | |
| PCR | Pharyngeal constriction ratio: pharyngeal area of maximum constriction/ open pharyngeal area |
| BCR | Bolus clearance ratio: bolus residual/ area of bolus prior to PES opening |