Pharyngeal Pressure and Timing During Bolus Transit

Area of Science:

• Gastroenterology
• Swallowing Physiology
• Medical Imaging

Background:

• Intrabolus pressure (IBP) at the upper esophageal sphincter (UES) is a known predictor of swallowing dysfunction.
• Previous research has focused on the hypopharynx, neglecting IBP throughout the entire pharynx.

Purpose of the Study:

• To describe intrabolus pressures within and surrounding a bolus throughout the pharynx and into the UES.
• To investigate the utility of high-resolution manometry (HRM) for pharyngeal pressure analysis.

Main Methods:

• Simultaneous high-resolution manometry (HRM) and videofluoroscopy in 10 healthy subjects.
• Subjects swallowed 10 mL thin-liquid barium boluses.
• Bolus movement and pressure events were tracked and analyzed.

Main Results:

• Low pressure observed at the bolus head, increasing modestly through the pharynx.
• High pressure recorded at the bolus tail, followed by a significant clearance event.
• HRM identified unique pharyngeal and UES pressure characteristics related to anatomy and UES transition.

Conclusions:

• Pharyngeal IBP patterns provide a detailed understanding of the swallowing process.
• HRM enhances pharyngeal pressure data collection, aiding in the analysis of complex anatomical regions.
• Future studies on aged and diseased populations could improve understanding of swallowing disorders.