Isolated pharyngeal swallow exists during normal human feeding

Hitoshi Kagaya, Michio Yokoyama, Eiichi Saitoh, Daisuke Kanamori, Chiaki Susa, Rebecca Z. German, Jeffrey B. Palmer

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Swallowing is one of the basic activities in humans. The pharynx functions as an airway and a food channel, and a pharyngeal swallow usually occurs after bolus transport from the oral cavity. However, direct fuid infusion through a catheter into the hypopharynx produces a pharyngeal swallow without the oral stage in experimental situations. The purpose of this study was to examine whether a pharyngeal swallow, which is not accompanied by bolus transport, can occur during normal human feeding. Fifty-three healthy volunteers (25-89 years) were recorded, via videofuoroscopic examination of swallowing, during 3 different swallowing trials: command swallow of 10 ml liquid barium, chew-swallow of corned beef, and chew-swallow of a mixture of corned beef and liquid barium. Subsequently each swallow was classifed as being either a consecutive pharyngeal swallow (CPS), following transport, or an isolated pharyngeal swallow (IPS), without immediately prior transport. The location of the bolus at swallow initiation was also noted. Of 307 trials, 681 swallows were identifed, which included 43 IPS and 638 CPS. IPS only occurred as the frst swallow of a trial, but the frequency of IPS did not differ between 28 younger (< 60 years) and 25 older (≥ 60 years) people. Of the three food types, IPS occurred more frequently with the mixed food than with liquid. These results suggest that IPS may represent an airway protective mechanism. In conclusion, IPS occurs in normal swallowing during a daily eating situation. Swallowing is more complex than a simple reflex.

Original languageEnglish
Pages (from-to)39-43
Number of pages5
JournalTohoku Journal of Experimental Medicine
Volume236
Issue number1
DOIs
Publication statusPublished - 02-05-2015

Fingerprint

Deglutition
Beef
Barium
Liquids
Catheters
Swallows
Food
Oral Stage
Hypopharynx

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Kagaya, Hitoshi ; Yokoyama, Michio ; Saitoh, Eiichi ; Kanamori, Daisuke ; Susa, Chiaki ; German, Rebecca Z. ; Palmer, Jeffrey B. / Isolated pharyngeal swallow exists during normal human feeding. In: Tohoku Journal of Experimental Medicine. 2015 ; Vol. 236, No. 1. pp. 39-43.
@article{6a725846d2214c098e51893b119c1f8f,
title = "Isolated pharyngeal swallow exists during normal human feeding",
abstract = "Swallowing is one of the basic activities in humans. The pharynx functions as an airway and a food channel, and a pharyngeal swallow usually occurs after bolus transport from the oral cavity. However, direct fuid infusion through a catheter into the hypopharynx produces a pharyngeal swallow without the oral stage in experimental situations. The purpose of this study was to examine whether a pharyngeal swallow, which is not accompanied by bolus transport, can occur during normal human feeding. Fifty-three healthy volunteers (25-89 years) were recorded, via videofuoroscopic examination of swallowing, during 3 different swallowing trials: command swallow of 10 ml liquid barium, chew-swallow of corned beef, and chew-swallow of a mixture of corned beef and liquid barium. Subsequently each swallow was classifed as being either a consecutive pharyngeal swallow (CPS), following transport, or an isolated pharyngeal swallow (IPS), without immediately prior transport. The location of the bolus at swallow initiation was also noted. Of 307 trials, 681 swallows were identifed, which included 43 IPS and 638 CPS. IPS only occurred as the frst swallow of a trial, but the frequency of IPS did not differ between 28 younger (< 60 years) and 25 older (≥ 60 years) people. Of the three food types, IPS occurred more frequently with the mixed food than with liquid. These results suggest that IPS may represent an airway protective mechanism. In conclusion, IPS occurs in normal swallowing during a daily eating situation. Swallowing is more complex than a simple reflex.",
author = "Hitoshi Kagaya and Michio Yokoyama and Eiichi Saitoh and Daisuke Kanamori and Chiaki Susa and German, {Rebecca Z.} and Palmer, {Jeffrey B.}",
year = "2015",
month = "5",
day = "2",
doi = "10.1620/tjem.236.39",
language = "English",
volume = "236",
pages = "39--43",
journal = "Tohoku Journal of Experimental Medicine",
issn = "0040-8727",
publisher = "Tohoku University Medical Press",
number = "1",

}

Isolated pharyngeal swallow exists during normal human feeding. / Kagaya, Hitoshi; Yokoyama, Michio; Saitoh, Eiichi; Kanamori, Daisuke; Susa, Chiaki; German, Rebecca Z.; Palmer, Jeffrey B.

In: Tohoku Journal of Experimental Medicine, Vol. 236, No. 1, 02.05.2015, p. 39-43.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Isolated pharyngeal swallow exists during normal human feeding

AU - Kagaya, Hitoshi

AU - Yokoyama, Michio

AU - Saitoh, Eiichi

AU - Kanamori, Daisuke

AU - Susa, Chiaki

AU - German, Rebecca Z.

AU - Palmer, Jeffrey B.

PY - 2015/5/2

Y1 - 2015/5/2

N2 - Swallowing is one of the basic activities in humans. The pharynx functions as an airway and a food channel, and a pharyngeal swallow usually occurs after bolus transport from the oral cavity. However, direct fuid infusion through a catheter into the hypopharynx produces a pharyngeal swallow without the oral stage in experimental situations. The purpose of this study was to examine whether a pharyngeal swallow, which is not accompanied by bolus transport, can occur during normal human feeding. Fifty-three healthy volunteers (25-89 years) were recorded, via videofuoroscopic examination of swallowing, during 3 different swallowing trials: command swallow of 10 ml liquid barium, chew-swallow of corned beef, and chew-swallow of a mixture of corned beef and liquid barium. Subsequently each swallow was classifed as being either a consecutive pharyngeal swallow (CPS), following transport, or an isolated pharyngeal swallow (IPS), without immediately prior transport. The location of the bolus at swallow initiation was also noted. Of 307 trials, 681 swallows were identifed, which included 43 IPS and 638 CPS. IPS only occurred as the frst swallow of a trial, but the frequency of IPS did not differ between 28 younger (< 60 years) and 25 older (≥ 60 years) people. Of the three food types, IPS occurred more frequently with the mixed food than with liquid. These results suggest that IPS may represent an airway protective mechanism. In conclusion, IPS occurs in normal swallowing during a daily eating situation. Swallowing is more complex than a simple reflex.

AB - Swallowing is one of the basic activities in humans. The pharynx functions as an airway and a food channel, and a pharyngeal swallow usually occurs after bolus transport from the oral cavity. However, direct fuid infusion through a catheter into the hypopharynx produces a pharyngeal swallow without the oral stage in experimental situations. The purpose of this study was to examine whether a pharyngeal swallow, which is not accompanied by bolus transport, can occur during normal human feeding. Fifty-three healthy volunteers (25-89 years) were recorded, via videofuoroscopic examination of swallowing, during 3 different swallowing trials: command swallow of 10 ml liquid barium, chew-swallow of corned beef, and chew-swallow of a mixture of corned beef and liquid barium. Subsequently each swallow was classifed as being either a consecutive pharyngeal swallow (CPS), following transport, or an isolated pharyngeal swallow (IPS), without immediately prior transport. The location of the bolus at swallow initiation was also noted. Of 307 trials, 681 swallows were identifed, which included 43 IPS and 638 CPS. IPS only occurred as the frst swallow of a trial, but the frequency of IPS did not differ between 28 younger (< 60 years) and 25 older (≥ 60 years) people. Of the three food types, IPS occurred more frequently with the mixed food than with liquid. These results suggest that IPS may represent an airway protective mechanism. In conclusion, IPS occurs in normal swallowing during a daily eating situation. Swallowing is more complex than a simple reflex.

UR - http://www.scopus.com/inward/record.url?scp=84929485126&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84929485126&partnerID=8YFLogxK

U2 - 10.1620/tjem.236.39

DO - 10.1620/tjem.236.39

M3 - Article

C2 - 25947116

AN - SCOPUS:84929485126

VL - 236

SP - 39

EP - 43

JO - Tohoku Journal of Experimental Medicine

JF - Tohoku Journal of Experimental Medicine

SN - 0040-8727

IS - 1

ER -