Objective: The aim of this study was to measure the initiation of pharyngeal
swallowing during discrete swallowing and during chew-swallowing in younger and older
healthy subjects and to determine the normal range of the stage transition duration (STD)
for different food boluses. The correlations between STDs were investigated.
Methods: Twenty-eight younger subjects (< 60 years old) and 25 older
subjects (≥ 60 years old) were enrolled. While in the sitting position, the subjects
swallowed 10 ml of thin liquid barium (LQ), 8 g of corned beef hash with barium (CB), 8 g
of cookie with barium (CK), and a two-phase mixture of 4 g of corned beef hash with barium
and 5 ml of thin liquid barium (MX). A videofluoroscopic examination of swallowing was
performed at 30 frames/s in the lateral projection. The delay in pharyngeal swallowing
(i.e., STD) was measured. The normal range (mean ± 2SD) of STDs for each bolus type was
determined, and correlations were calculated to examine the relationship among STDs.
Results: The median STDs for LQ, CB, CK, and MX in all subjects were 0.0,
1.2, 2.4, and 1.9 s, respectively. The STDs were prolonged for CB, CK, and MX compared
with LQ. Additionally, the median STD was longer for LQ, CB, and CK in older than in
younger subjects. No significant correlations were found between STDs except for those
between CB and CK. Conclusions: A delayed pharyngeal response is commonly
observed during chew-swallowing. Liquids, solids, and two-phase mixtures exhibit
independent timings of pharyngeal swallow initiation.
抄録全体を表示