Gastric dumping syndrome pathophysiology
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
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Overview
The exact pathogenesis of dumping syndrome is not fully understood. Relatively few recent studies have been devoted to elucidating the mechanisms involved in early and late dumping syndromes, and much of our current knowledge is based on older literature[1]. Symptoms of early and late dumping syndrome appear to be caused by distinct pathophysiological mechanisms.
Pathophysiology
Pathogenesis
Dumping syndrome occurs secondary to various conditions such as after gastric surgery (especially on taking meals high in carbohydrates after the procudure), diabetes mellitus, in Zolinger-Ellison syndrome.... The pathogenesis of dumping syndrome varies according to the etiology. The exact reason isn't yet concluded, although several known phenomena may contribute to the development of early dumping symptoms.[2]
Flowchart
The following flow chart outlines the major events involved in the pathogenesis of dumping syndrome:[3]
| Hyperosmolar meal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fluid shift from blood to gut | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Rapid glucose absorption into the blood | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Hyperglycemia | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Release of hormones : • VIP • GIP • PYY • GLP-1 • Neurotensin | Excessive insulin release | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reactive hypoglycemia | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Symptoms | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Pathogenesis in surgeries
Pathogenesis in diseases
- Dumping syndrome is most common in patients with certain types of stomach surgery, such as a gastrectomy or gastric bypass surgery, that allow the stomach to empty rapidly. Dumping syndrome can also occur as a result of complications after a cholecystectomy (gallbladder removal).[1]
- Patients with Zollinger-Ellison syndrome, a rare disorder involving extreme peptic ulcer disease and gastrin-secreting tumors in the pancreas, may also have dumping syndrome.
- Dumping is also common for esophageal cancer patients who have had an esophagectomy; surgery to remove the cancerous portion of their esophagus. The stomach is pulled into the chest and attached to what remains of the esophagus, leaving a short digestive tract. Both early and late dumping syndrome can occur.
- Finally, patients with connective tissue conditions such as Ehlers-Danlos syndrome can experience "late" dumping as a result of decreased motility.
- In addition, people with this syndrome often suffer from low blood sugar, or hypoglycemia, because the rapid "dumping" of food triggers the pancreas to release excessive amounts of insulin into the bloodstream. This type of hypoglycemia is referred to as "alimentary hypoglycemia".
Genetics
Gross Pathology
Microscopic Pathology
References
- ↑ Machella TE (1949). "The Mechanism of the Post-gastrectomy "Dumping" Syndrome". Ann. Surg. 130 (2): 145–59. PMC 1616289. PMID 17859417.
- ↑ Vecht J, Masclee AA, Lamers CB (1997). "The dumping syndrome. Current insights into pathophysiology, diagnosis and treatment". Scand. J. Gastroenterol. Suppl. 223: 21–7. PMID 9200302.
- ↑ van Beek, A. P.; Emous, M.; Laville, M.; Tack, J. (2017). "Dumping syndrome after esophageal, gastric or bariatric surgery: pathophysiology, diagnosis, and management". Obesity Reviews. 18 (1): 68–85. doi:10.1111/obr.12467. ISSN 1467-7881.