The Relationship Between Pharyngeal Constriction and Post-swallow Residue.

Area of Science:

• Deglutition physiology
• Swallowing biomechanics
• Oropharyngeal dysphagia research

Background:

• Pharyngeal constriction is a key component of effective swallowing.
• Quantifying pharyngeal constriction may help differentiate functional from impaired swallows.
• Post-swallow residue is a common indicator of swallowing impairment.

Purpose of the Study:

• To investigate the association between pharyngeal constriction measures and post-swallow residue.
• To determine if reduced pharyngeal constriction correlates with increased residue in neurogenic dysphagia patients.

Main Methods:

• Videofluoroscopy of 5ml liquid barium swallows analyzed in 20 healthy adults and 40 dysphagia patients.
• Anatomically normalized, pixel-based pharyngeal area measurements at rest and maximum constriction.
• Calculation of pharyngeal constriction ratio and normalized residue ratio scale (NRRS).

Main Results:

• Significantly larger pharyngeal areas at maximum constriction (indicating less constriction) were observed in individuals with post-swallow residue.
• This finding was consistent for residue in both the valleculae and pyriform sinuses.
• Pharyngeal constriction ratio was significantly different between individuals with and without residue.

Conclusions:

• Reduced pharyngeal constriction is a significant factor contributing to post-swallow residue.
• Objective measures of pharyngeal constriction can identify swallowing impairment.
• Interventions aimed at enhancing pharyngeal constriction may effectively reduce post-swallow residue.