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Irritable Bowel Syndrome

Irritable Bowel Syndrome

DefinitionIrritable bowel syndrome (IBS) is a functional gastrointestinal disorder characterized by recurrent combinations of abdominal pain, bloating, diarrhea, or constipation.Pathophysiology of irritable bowel syndromeIts pathophysiology is multifactorial, involving disturbances in motility, sensory processing, microbial balance, barrier integrity, and gut–brain communication. These mechanisms interact to produce symptoms that vary across IBS subtypes.Altered Motility PatternsDisordered...

Irritable Bowel Syndrome I: Introduction

Irritable Bowel Syndrome I: Introduction

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.
The pathogenesis of IBS involves a complex interplay of the following factors:
Altered...

Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation

Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation

Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation
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:

Taste Buds and Receptors

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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...

Olfactory Receptors: Location and Structure

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...

The Physiology of Taste

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the diffusion of...

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Olfactory and gustatory function in irritable bowel syndrome.

Silke Steinbach¹, Wolfgang Reindl, Claudia Kessel

¹Department of Otorhinolaryngology, Philipps University, Deutschhausstrasse 3, 35037 Marburg, Germany. silkesteinbach@hotmail.com

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery

|December 31, 2009

Summary

This summary is machine-generated.

This study suggests Irritable Bowel Syndrome (IBS) may stem from central nervous system origins. IBS patients showed altered odor identification and discrimination, supporting a brain-based etiology over peripheral factors.

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Area of Science:

Gastroenterology
Neuroscience
Sensory Science

Background:

Irritable Bowel Syndrome (IBS) is a prevalent functional gastrointestinal disorder.
The underlying etiology of IBS, whether central (brain-related) or peripheral (gut-related), remains debated.
Olfactory and gustatory functions have not been extensively studied in IBS patients.

Purpose of the Study:

To investigate olfactory and gustatory functions in patients diagnosed with IBS.
To explore the potential role of sensory pathways in the pathophysiology of IBS.
To differentiate between central and peripheral etiologies of IBS based on sensory function.

Main Methods:

Utilized validated tests (Sniffin' Sticks, taste strips) to assess olfactory identification (ID), discrimination (DIS), and threshold (THR), as well as taste perception.
Evaluated 43 IBS patients (32 female, 11 male) meeting ROME III criteria.
Compared patient results to established normative data.

Main Results:

IBS patients exhibited significantly decreased odor threshold (THR) scores, suggesting impaired peripheral olfactory function.
IBS patients demonstrated significantly increased odor identification (ID) and discrimination (DIS) scores, indicating heightened central olfactory processing.
No significant differences were observed in the taste function of IBS patients compared to normative data.

Conclusions:

The findings support a central (brain-related) etiology for IBS.
Altered central processing of olfactory stimuli, rather than peripheral sensory deficits, appears more characteristic of IBS.
Taste function does not seem to be a significant factor in IBS pathophysiology.