Gastroparesis
Medical Revising Author: Dennis Lee, MD
Medical Revising Editor: Jay W. Marks, MD
What is gastroparesis?
Gastroparesis means paralysis of the muscles of the
stomach. Gastroparesis results in delayed emptying of food from the stomach into the small intestine.
The stomach is a hollow organ composed primarily of
muscle that serves as a storage container for food. Food in the stomach is
ground into tiny pieces by the constant churning that is generated by the
contractions of the stomach's muscles. Once the food has been adequately ground,
it slowly is emptied from the stomach into the intestine in a metered fashion.
Only food ground into small particles can be emptied from the stomach in a
normal fashion, and smaller particles are digested better in the intestine.
Moreover, the metering process
allows the emptied food to be well-mixed with the digestive juices of the
intestine, pancreas, and liver (bile) and to be absorbed well from the
intestine.
When the stomach's muscles are paralyzed, food is not
thoroughly ground and does not empty into the intestine normally. Since the
muscular
mechanisms whereby ground, solid food and liquid food are emptied from the
stomach are different, there may be delayed emptying of solid food (most
common), solid and liquid food (less common), or liquid food alone (least
common).
What are gastroparesis symptoms and signs?
The primary symptoms of gastroparesis are nausea and
vomiting. Other symptoms of gastroparesis include abdominal pain, bloating,
early satiety (feeling full quickly when eating), and in severe cases, weight
loss due to a reduced intake
of food because of the symptoms. Reduced intake of food and restriction of the
types of food that are eaten can lead to nutritional deficiencies.
The vomiting of gastroparesis usually occurs after
meals; however, with severe gastroparesis, vomiting may occur without eating due
simply to the accumulation of secretions in the stomach. The characteristic
vomiting happens several hours after a meal when the stomach is maximally
distended by the presence of food and secretions stimulated by the meal. Since
the grinding action of the stomach is absent, the vomited food often remains in
larger pieces and is easily recognized. (Contrast
this with the more common type of vomiting in which the food appears as small,
uniform, unidentifiable particles.)
Other, less frequent effects of gastroparesis are the
promotion of gastroesophageal reflux disease (GERD) and
malnutrition.
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