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Related Concept Videos

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...
Assessment of the Gastrointestinal System I: Subjective Data01:17

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Assessing the gastrointestinal (GI) system is a complex process that begins with collecting subjective data. This data, collected through patient interviews, provides crucial insights into the patient's health history, perception patterns, and lifestyle habits, all contributing significantly to GI health.
Health History
The initial step in assessing the GI system is obtaining a comprehensive health history. This includes inquiring about the patient's history or presence of problems related to...
Irritable Bowel Syndrome I: Introduction01:17

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Irritable Bowel Syndrome (IBS) is characterized by functional disturbances in the gastrointestinal system, presenting a cluster of symptoms without evident structural or biochemical abnormalities. It primarily affects the large intestine and may cause abdominal pain, bloating, excessive gas, diarrhea, constipation, or both.
IBS is a chronic condition that can persist over a long period or recur frequently.
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Altered...
Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation01:30

Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation

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Irritable Bowel Syndrome (IBS) is classified into subtypes based on the predominant bowel habits as determined by the Bristol Stool Form Scale (BSFS). The subtypes are:
Pyloric Obstruction01:11

Pyloric Obstruction

Pyloric obstruction, also referred to as gastric outlet obstruction, is a condition characterized by narrowing or blockage at the pylorus—the muscular valve regulating the flow of stomach contents into the duodenum. When this passage becomes impaired, the stomach cannot effectively empty its contents into the small intestine. This disruption leads to a range of gastrointestinal symptoms, including early satiety, bloating, epigastric pain, postprandial nausea, persistent vomiting, and...
Irritable Bowel Syndrome01:23

Irritable Bowel Syndrome

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Related Experiment Video

Updated: Jul 12, 2026

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
08:42

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Published on: November 27, 2016

Intestinal gas distribution determines abdominal symptoms.

H Harder1, J Serra, F Azpiroz

  • 1Digestive System Research Unit, University Hospital Vall d'Hebron, Autonomous University of Barcelona, Barcelona, Spain.

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Intestinal gas location, not just volume, significantly impacts abdominal symptoms in healthy individuals. Gas distribution and gut motor response influence symptom perception more than gas volume alone.

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Area of Science:

  • Gastroenterology
  • Physiology
  • Functional Gut Disorders

Background:

  • Patients with functional gut disorders exhibit poor tolerance to intestinal gas.
  • The underlying mechanisms of this gas intolerance remain largely unknown.

Purpose of the Study:

  • To investigate whether the amount or distribution of intestinal gas is more critical for symptom generation.
  • To establish correlations between gut motility and the perception of gas loads.

Main Methods:

  • Infusion of a gas mixture into the jejunum or rectum of 14 healthy subjects.
  • Measurement of abdominal perception, distension, and gut tone using duodenal and rectal barostats.
  • Assessment of gas clearance and gut motor responses (proximal contraction/distal relaxation).

Main Results:

  • Jejunal gas infusion led to significantly higher symptom perception scores compared to rectal infusion, despite similar gas retention volumes and abdominal distension.
  • Jejunal gas loads induced proximal gut contraction, while colonic gas loads caused distal relaxation.
  • Gas volume primarily influenced abdominal distension, whereas distribution affected symptom perception.

Conclusions:

  • Abdominal distension is determined by the volume of gas in the gut.
  • Symptom perception is influenced by the intraluminal distribution of gas and potentially the gut's motor response to gas loads.
  • Findings suggest a complex interplay between gas dynamics, gut motility, and sensory perception in functional gut disorders.