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Lack of an Effect of Gastric Capsaicin on the Rectal Component of the Gastrocolonic Response

Abstract

Luminal capsaicin induces local and distant reflexes in the upper gastrointestinal tract and stimulates lower gastrointestinal symptoms in susceptible persons. We aimed to evaluate the effect of gastric capsaicin on rectal motor function and sensation.

Methods

Eighteen healthy volunteers participated twice, at least 1 week apart, in this double-blind, placebo-controlled crossover study. Participants swallowed a gastric tube for capsaicin or saline infusion. A barostat tube was placed in the rectum to measure rectal tone before and during gastric capsaicin (40 µg/ml, 2.5 ml/min) or placebo infusion and to conduct distension experiments before and after gastric infusions. Gastric infusions were terminated after 60 min or when epigastric discomfort occurred. Differences in rectal tone, compliance, and sensitivity between gastric placebo and gastric capsaicin were determined.

Results

On both study days, basal rectal volumes, compliance, and sensitivity parameters were comparable (NS) before gastric infusions. Gastric capsaicin infusion induced epigastric discomfort that necessitated termination of infusion after 29.6 ± 12.3 min (saline: 54.7 ± 8.9 min; p < 0.01). Rectal tone, aggregate perception scores, and rectal compliance did not differ between placebo and capsaicin trials (p > 0.05). Rectal tone increased significantly only when capsaicin induced epigastric discomfort (p < 0.05). The reproducibility of the barostat trial was acceptable with significant correlations of volumes, pressures (< 0.05; r 2 from 0.41 to 0.55), rectal compliance (p < 0.01; r 2 = 0.44), and aggregate perception scores (p values all < 0.05; r 2 from 0.44 to 0.0.65) between the two barostat trials.

Conclusion

Gastric perfusion with capsaicin does not directly influence rectal physiology through a reflex arc.

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Acknowledgments

Supported by research Grant P 18101-B09 from the Austrian Science Fund (FWF, Fonds zur Förderung der wissenschaftlichen Forschung) to Dr. J. Hammer was gratefully acknowledged.

Author’s contribution

MF contributed with acquisition of the data; analysis and interpretation of the data; statistical analysis; administrative, technical, or material support, revision of the manuscript. JH contributed with study concept and design; funding acquisition; study supervision; analysis and interpretation of the data; drafting of the manuscript and critical revision of the manuscript for important intellectual content.

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Correspondence to Johann Hammer.

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Führer, M., Hammer, J. Lack of an Effect of Gastric Capsaicin on the Rectal Component of the Gastrocolonic Response. Dig Dis Sci 62, 3542–3549 (2017). https://doi.org/10.1007/s10620-017-4822-5

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  • DOI: https://doi.org/10.1007/s10620-017-4822-5

Keywords

  • Gastrocolonic reflex
  • Rectal barostat
  • Capsaicin
  • Reproducibility