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- W2168268771 abstract "Both circular muscles (CM) and longitudinal muscles (LM) of the esophagus participate in peristalsis. Various measurement techniques have yielded conflicting information as to the temporal correlation between contraction in the two muscle layers. High-frequency intraluminal ultrasound (HFIUS) is a novel technique to detect contraction of LM and CM of the esophagus. We investigated the temporal correlation between the CM and LM contraction during ascending excitatory and descending inhibitory reflexes using HFIUS. A manometric catheter equipped with two balloons and a 12.5-MHz ultrasound transducer catheter was used to study 10 normal healthy subjects. The changes in muscle thickness and pressure, proximal and distal to esophageal distension, were recorded at 5 and 10 cm above the lower esophageal sphincter (LES). The esophageal distension induced an increase in pressure and an increase in muscle thickness of both CM and LM layers proximal to the distension site. The onset of increase in muscle thickness and peak muscle thickness in two layers occurred at the same time. There was a close temporal correlation between the changes in pressure and changes in muscle thickness. Atropine inhibited the distension-related pressure and muscle thickness increase in both layers. Distal to the esophageal distension, there was no change in pressure but a decrease in the thickness of the two muscle layers. The decrease in muscle thickness of the two layers occurred at the same time. The responses of the two muscle layers to distension were similar at 5- and 10-cm sites above the LES. HFIUS is a relatively noninvasive technique to study the LM layer response during peristalsis in vivo. Our data indicate that the two muscle layers may contract and relax together during distension-related peristaltic reflexes in the esophagus." @default.
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- W2168268771 date "1998-10-01" @default.
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- W2168268771 title "Distension-related responses in circular and longitudinal muscle of the human esophagus: an ultrasonographic study" @default.
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- W2168268771 doi "https://doi.org/10.1152/ajpgi.1998.275.4.g805" @default.
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