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Gastric motility measurement by MRI
R Fraser1, W Schwizer, J Borovicka
1Department of Medicine, Royal Adelaide Hospital, Adelaide, South Australia.
Digestive Diseases and Sciences
|December 1, 1994
Summary
Gastric emptying slows with higher dextrose concentrations. Antral motility changes significantly impact nutrient meal gastric emptying, with greater variations observed after 10% dextrose intake.
Area of Science:
- Gastroenterology
- Physiology
- Medical Imaging
Background:
- The precise motor mechanisms governing gastric emptying of liquid nutrients remain incompletely understood.
- Understanding these mechanisms is crucial for managing digestive disorders and optimizing nutritional intake.
Purpose of the Study:
- To investigate the relationship between nutrient concentration and gastric emptying dynamics.
- To elucidate the role of gastric motility, specifically antral contractions, in regulating gastric emptying of nutrient liquids.
Main Methods:
- Magnetic Resonance Imaging (MRI) was employed in seven healthy volunteers.
- Gastric emptying and motility were assessed after ingesting 500 ml of either 10% or 25% dextrose solutions.
- Dextrose solutions were labeled with 1 mM Gadolinium-DOTA (Gd-DOTA) for imaging, with transaxial scans for emptying and fast coronal scans for motility.
Main Results:
- Gastric emptying was significantly slower following the ingestion of 25% dextrose compared to 10% dextrose.
- Proximal gastric diameter remained relatively stable post-ingestion for both concentrations.
- Antral contractile frequency and depth exhibited marked variations, with greater variability observed after the 10% dextrose meal.
Conclusions:
- Nutrient concentration influences the rate of gastric emptying.
- Changes in antral motility play a significant role in modulating gastric emptying in response to nutrient meals.
- These findings highlight the dynamic interplay between nutrient load and gastric motor function.