title: The Effects of Bolus Volume and Texture on Pharyngeal Pressure Events Using High-resolution Manometry and Its Comparison with Videofluoroscopic Swallowing Study.
abstract: OBJECTIVE
  The purpose of this study was to develop new parameters of high-resolution manometry (HRM) and to applicate these to quantify the effect of bolus volume and texture on pharyngeal swallowing.
  
  
  METHODS
  Ten healthy subjects prospectively swallowed dry, thin fluid 2 mL, thin fluid 5 mL, thin fluid 10 mL, and drinking twice to compare effects of bolus volume. To compare effect of texture, subjects swallowed thin fluid 5 mL, yogurt 5 mL, and bread twice. A 32-sensor HRM catheter and BioVIEW ANALYSIS software were used for data collection and analysis. HRM data were synchronized with kinematic analysis of videofluoroscopic swallowing study (VFSS) using epiglottis tilting.
  
  
  RESULTS
  Linear correlation analysis for volume showed significant correlation for area of velopharynx, duration of velopharynx, pre-upper esophageal sphincter (UES) maximal pressure, minimal UES pressure, UES activity time, and nadir UES duration. In the correlation with texture, all parameters were not significantly different. The contraction of the velopharynx was faster than laryngeal elevation. Thedurations of UES relaxation was shorter in the kinematic analysis than HRM.
  
  
  CONCLUSIONS
  The bolus volume was shown to have significant effect on pharyngeal pressure and timing, but the texture did not show any effect on pharyngeal swallowing. The parameters of HRM were more sensitive than those of kinematic analysis. As the parameters of HRM are based on precise anatomic structure and the kinematic analysis reflects the actions of multiple anatomic structures, HRM and VFSS should be used according to their purposes.
authors.affiliation: Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
authors.forename: Ju Seok
authors.initials: JS
authors.lastname: Ryu
authors.affiliation: Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
authors.forename: Donghwi
authors.initials: D
authors.lastname: Park
authors.affiliation: Department of Rehabilitation Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
authors.forename: Yoongul
authors.initials: Y
authors.lastname: Oh
authors.affiliation: Department of Rehabilitation Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
authors.forename: Seok Tae
authors.initials: ST
authors.lastname: Lee
authors.affiliation: Department of Rehabilitation Medicine, St. Paul's Hospital, College of Medicine, The Catholic University, Seoul, Korea.
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Kang
keywords: Biomechanics; Deglutition; Deglutition disorders; Manometry; Pressure