Pyloric Opening and Closure Evaluated by Means of Strain Gauge Force Transducers.

Toyota, Kazuhiro

doi:10.1540/jsmr.34.13

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…These findings suggest that the indication for PPG in the treatment of early gastric cancer can be extended to radical resection of a group 1 lymph node. It has been reported that pyloric relaxation, recorded under a baseline by the experiment using SG, is observed only in phase III and is synchronized with antral contractions in normal dogs [7]. Our observations in normal dogs are consistent with this finding.…”

Section: Discussionsupporting

confidence: 92%

Pyloric motility after pylorus‐preserving gastrectomy with or without the pyloric branch of the vagus nerve

et al. 2002

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An attempt was made to examine gastropyloric motility after pylorus-preserving gastrectomy (PPG) and to determine the influence of the pyloric branch of the vagus nerve in the dog. Fifteen dogs were divided into three groups of five. PPG with preservation (PPPG) and resection of the pyloric branch of the vagus (RPPG) were performed, and controls were prepared. Interdigestive and digestive gastropyloroduodenal motility was recorded after a 2-week recovery period using strain-gauge force transducers (SG). Radiopaque markers (ROMs) were used to assess gastric emptying. No significant differences were found between PPPG and RPPG in terms of gastropyloroduodenal motility during either the interdigestive or the postprandial state. During phase III of the interdigestive state, pyloric relaxation correlated with contraction of the gastric body after both PPPG and RPPG. During the first month it was accompanied by tonic and phasic pyloric contractions after feeding and delayed gastric emptying in two groups. By the end of the first month these pyloric contractions had diminished, and the rate of gastric emptying was similar to that of the controls. We concluded that it is not necessary to preserve the pyloric branch of the vagus for gastropyloroduodenal motility after PPG. Gastric stasis during the early postoperative period is due to tonic and phasic contractions of the pylorus.

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Section: Discussionsupporting

confidence: 92%

Pyloric motility after pylorus‐preserving gastrectomy with or without the pyloric branch of the vagus nerve

et al. 2002

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“…In the present study, the increased frequency of pyloric relaxations during phase II was observed in cholecystectomized dogs. The pyloric ring opens during relaxation of the pyloric sphincter 20 . In humans, the frequency of duodenogastric reflux is negatively correlated with the pyloric pressure 12 .…”

Section: Discussionmentioning

confidence: 99%

Duodenogastric reflux following cholecystectomy in the dog: role of antroduodenal motor function

Nogi

Haruma

Taniguchi

et al. 2001

Aliment Pharmacol Ther

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Background : Duodenogastric reflux has been implicated in the pathogenesis of gastric ulcer and gastritis. Duodenogastric reflux after cholecystectomy is also a possible cause of post‐cholecystectomy syndrome. Aim : To investigate the role of antroduodenal motor function in increased duodenogastric reflux following cholecystectomy and the effect of trimebutine maleate (trimebutine) on the duodenogastric reflux in conscious dogs. Methods : Antropyloric and duodenal motility and bile acids content in the gastric juice were measured for 3 h during the inter‐digestive state in dogs with or without cholecystectomy. Results : Bile acids content in the gastric juice of cholecystectomized dogs was significantly higher than that of non‐cholecystectomized dogs. The frequency of pyloric relaxation during phase II of the migrating motor complex was significantly increased following cholecystectomy. Intravenous infusion of trimebutine inhibited both the increased duodenogastric reflux and the frequency of pyloric relaxation in the cholecystectomized dog. Conclusion : Duodenogastric reflux and frequency of pyloric relaxations were increased in cholecystectomized dogs and trimebutine suppressed both of them. These findings suggest that the increased frequency of pyloric relaxation contributes to the duodenogastric reflux following cholecystectomy.

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“…The highest rate of coordinated contractions occurs in phase III. This is accompanied by reduced resistance in the pylorus due to the action of motilin (22).…”

Section: The Motility Pattern During Fastingmentioning

confidence: 99%

In vitro evaluation of ultrasound Doppler strain rate imaging: modification for measurement in a slowly moving tissue phantom

Matre

Ahmed

Gregersen

et al. 2003

Ultrasound in Medicine & Biology

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Doppler strain rate imaging (SRI) was evaluated in vitro using a silicone strip phantom mimicking slowly moving tissue. A test apparatus was developed that enabled controlled strain experiments with variable strain and strain rate to be performed. SRI strain was measured at eight different calculated strains (range 5.7 to 63.4 %) at three different pump speeds with tissue velocity 0.1, 0.5 and 1.0 mm/s. The effect of varying tissue velocity and strain sample size on the measured SRI strain was elaborated. SRI strains agreed well with calculated values for strain when SRI strain was measured as the average over the whole strip cross-section and the strain sample size was 1.9 mm (mean difference = 2.78%, limits of agreement +/- 9.97% for tissue velocity 1.0 mm/s, n = 8). The variance was substantial if single central samples were used, especially for strain sample size of 0.8 mm (mean difference = -7.47%, limits of agreement +/- 20.90 for tissue velocity 0.5 mm/s, n = 24). Increasing the strain sample size to 1.9 mm removed some of the underestimation (giving mean difference of -4.46%, n = 24). We found low intra- and interobserver variation. This study indicates that, for the SRI method to give accurate estimates of strain, strain sample size should be in the region of 2 mm. Averaging over several ultrasound (US) beams increased the accuracy further.

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Pyloric Opening and Closure Evaluated by Means of Strain Gauge Force Transducers.

Cited by 5 publications

References 24 publications

Pyloric motility after pylorus‐preserving gastrectomy with or without the pyloric branch of the vagus nerve

Pyloric motility after pylorus‐preserving gastrectomy with or without the pyloric branch of the vagus nerve

Duodenogastric reflux following cholecystectomy in the dog: role of antroduodenal motor function

In vitro evaluation of ultrasound Doppler strain rate imaging: modification for measurement in a slowly moving tissue phantom

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