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Related Concept Videos

Gastric Motility01:16

Gastric Motility

Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
Peristaltic Waves and Chyme Formation
Upon food entry, the stomach initiates...
Gastric Emptying01:16

Gastric Emptying

Gastric emptying occurs when the stomach gradually releases chyme into the duodenum. When the stomach is distended, it triggers the release of gastrin, a hormone that promotes gastric acid secretion to aid in digestion. Additionally, stomach distension contributes to peristaltic waves that propel gastric contents toward the pyloric region. The gastroenteric reflex, on the other hand, primarily stimulates peristalsis in the intestines, facilitating the movement of contents further along the...
Gastric Phase of Digestion01:26

Gastric Phase of Digestion

The gastric phase of digestion begins as soon as food enters the stomach. The incoming food bolus triggers neural and hormonal mechanisms, which last approximately 3 to 4 hours. During this phase, the stomach undergoes significant changes to prepare the food for further digestion and absorption.
When food enters the stomach, it stretches the stomach walls and activates stretch receptors. This triggers local reflexes of the enteric nervous system, mediated through the myenteric plexus. These...
Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and solid...
Gastrointestinal Motility Disorders01:20

Gastrointestinal Motility Disorders

Gastrointestinal or GI motility disorders are characterized by irregular gastrointestinal tract movements, disrupting food transit from the mouth to the anus. They are caused by damage or dysfunction in gut muscles or nerves. These disorders can cause symptoms such as severe constipation, diarrhea, abdominal pain, and swallowing difficulties. Disorders can affect any segment of the GI tract and range widely in severity, from common conditions like GERD to life-threatening conditions like...
Drug Absorption: Factors Affecting GI Absorption01:19

Drug Absorption: Factors Affecting GI Absorption

The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
In...

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Fabrication and Implantation of Miniature Dual-element Strain Gages for Measuring In Vivo Gastrointestinal Contractions in Rodents.
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Understanding gastric forces calculated from high-resolution pill tracking.

Bryan Laulicht1, Anubhav Tripathi, Vincent Schlageter

  • 1Department of Molecular Pharmacology, Division of Engineering and Medical Science, Brown University, Providence, RI 02912, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 21, 2010
PubMed
Summary

This study quantifies the forces and torques acting on ingested pills in the stomach using a magnetic pill. These measurements provide a baseline for gastric motility and aid in understanding gastrointestinal dysmotility.

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Area of Science:

  • Gastroenterology
  • Biomechanics
  • Medical Devices

Background:

  • Existing methods for monitoring gastrointestinal motility lack direct, quantitative force measurements.
  • Understanding gastric contractility is crucial for drug delivery and diagnosing motility disorders.

Purpose of the Study:

  • To directly measure and quantify the motive forces and torques experienced by an orally ingested pill in the human stomach.
  • To establish a baseline for gastric forces in healthy individuals and compare with animal models.

Main Methods:

  • Utilized real-time, in vivo measurements of a magnetic pill's movement within the stomach.
  • Calculated three-dimensional net force and two-dimensional net torque vectors based on pill position data.
  • Analyzed force and torque ranges correlated with gastric digestion phases and maximum forces during emptying.

Main Results:

  • Quantified in vivo forces and torques experienced by pills in fasted and fed human stomachs.
  • Demonstrated correlation between force/torque ranges and physiological phases of gastric digestion.
  • Provided comparative data between human and animal models for gastric contractility.

Conclusions:

  • Direct force measurements offer a novel quantitative assessment of gastric motility.
  • Force vector directionality can help identify muscle groups involved in gastrointestinal dysmotility.
  • Comparative human-animal data enhances understanding of gastric contractility for pill design and formulation testing.