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Related Concept Videos

Enteric Nervous System: Regulation of GI Motor Activity01:11

Enteric Nervous System: Regulation of GI Motor Activity

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During periods of fasting, the ENS initiates the migrating myoelectric complex, a program...
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Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
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Related Experiment Video

Updated: Jul 11, 2026

Fabrication and Implantation of Miniature Dual-element Strain Gages for Measuring In Vivo Gastrointestinal Contractions in Rodents.
09:29

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Intestinal motor activity in experimental hyperthyroidism in conscious dogs.

M Karaus1, M Wienbeck, M Grussendorf

  • 1Department of Medicine, University Hospitals, Düsseldorf, Federal Republic of Germany.

Gastroenterology
|October 1, 1989
PubMed
Summary
This summary is machine-generated.

Experimental hyperthyroidism alters canine small intestinal motility, increasing contraction frequency and introducing giant migrating contractions. These changes likely explain accelerated small bowel transit observed in hyperthyroid states.

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Area of Science:

  • Gastroenterology
  • Endocrinology
  • Physiology

Background:

  • Hyperthyroidism is associated with accelerated gastrointestinal transit.
  • The specific motor effects of hyperthyroidism on the small intestine remain unclear.
  • Understanding these effects may reveal mechanisms for altered gut motility.

Purpose of the Study:

  • To investigate the small intestinal motor effects of experimental hyperthyroidism in conscious dogs.
  • To elucidate the potential mechanisms behind accelerated small bowel transit in hyperthyroidism.

Main Methods:

  • Eight conscious dogs were utilized for the study.
  • Strain gauge transducers were surgically implanted on the small intestine.
  • Long-term hyperthyroidism was induced using thyroxin administration (100 and 200 micrograms/kg/day).

Main Results:

  • Thyroxin administration did not disrupt cyclic fasting motor activity.
  • A slight increase in the migrating motor complex period was observed (p < 0.05).
  • Contractile frequency increased dose-dependently during phase 2 (up to 29%) and the digestive state (up to 27%) (p < 0.05).
  • Giant migrating contractions, absent in controls, were observed in 50% of dogs during thyroxin administration.

Conclusions:

  • Experimental hyperthyroidism significantly alters both fasted and postprandial small intestinal motility in dogs.
  • Accelerated small bowel transit in hyperthyroidism may result from altered contractile patterns during phase 2 and digestive states.
  • Increased frequency of giant migrating contractions could also contribute to faster transit times.