Pharyngeal peristaltic pressure variability, operational range, and functional reserve.

Area of Science:

• Gastroenterology
• Physiology
• Swallowing Disorders

Background:

• Pharyngeal motor function's understanding remains incomplete, particularly regarding peristaltic pressure amplitude variability.
• Variability in manometric findings can complicate interpretation but offers insights into pharyngeal contractile function's operational range and reserve.

Purpose of the Study:

• To define intra- and intersubject and intersession variability of pharyngeal manometric parameters.
• To determine the optimal number of swallow repetitions for acquiring reliable pharyngeal manometric data based on variability.

Main Methods:

• High-resolution manometry was used to record pharyngeal peristalsis in 10 healthy subjects.
• Subjects underwent two sessions of 20 sequences of 0.5-ml water swallows.
• Statistical analyses included two-way ANOVA, Shapiro-Wilk normality test, and Monte Carlo simulation.

Main Results:

• Significant variations in mean peak peristaltic pressure and pharyngeal contractile integral were observed across sites and within subjects.
• Both inter- and intrasubject variability were significant for key pharyngeal manometric parameters.
• Monte Carlo simulations indicated that optimal sample sizes for reliable data ranged from 3 to 15 swallow repetitions.

Conclusions:

• Significant intra- and intersubject variability exists in pharyngeal peristalsis, highlighting a broad operational range and reserve.
• The observed variability necessitates parameter-specific sample size calculations for accurate and reliable pharyngeal manometric results.
• These findings provide crucial data for interpreting pharyngeal manometry and designing future studies.