Sequential coordination between lingual and pharyngeal pressures produced during dry swallowing

Area of Science:

• Physiology
• Biomechanics
• Swallowing Mechanics

Background:

• Oropharyngeal pressure dynamics are crucial for effective swallowing.
• Understanding the interplay between tongue and pharyngeal pressure is essential for diagnosing swallowing disorders.

Purpose of the Study:

• To investigate the temporal relationship and pressure dynamics between tongue pressure (TP) and pharyngeal pressure (PP) during dry swallowing in healthy individuals.
• To analyze the onset, peak, and offset times of TP and PP and their correlations.

Main Methods:

• Ten healthy subjects participated in the study.
• Tongue pressure was measured using a sensor sheet system on the hard palate.
• Pharyngeal pressure was measured using a manometric catheter.
• Synchronized waveforms were analyzed to determine pressure event timings and correlations.

Main Results:

• Tongue pressure onset occurred earlier than pharyngeal pressure onset.
• Pharyngeal pressure onset was temporally linked to the peak of tongue pressure, particularly in the posterior-median region.
• The offset of pharyngeal pressure was temporally linked to the offset of tongue pressure.

Conclusions:

• The findings elucidate the generation of oropharyngeal pressure flow during dry swallowing.
• The temporal coordination between tongue and pharyngeal pressure contributes to efficient bolus transport and swallowing safety.