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Gastroparesis And Diabetes Fact Book
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What Is Gastroparesis?
Gastroparesis is a disorder in which the stomach
takes too long to empty its contents. Gastroparesis is most often a
complication of type 1 diabetes. At least 20 percent of people with type 1
diabetes develop gastroparesis. It also occurs in people with type 2
diabetes, although less often.
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Gastroparesis happens when nerves to the stomach are damaged or stop
working. The vagus nerve controls the movement of food through the
digestive tract. If the vagus nerve is damaged, the muscles of the stomach
and intestines do not work normally, and the movement of food is slowed or
stopped.
Diabetes can damage the vagus nerve if blood glucose (sugar) levels
remain high over a long period of time. High blood glucose causes chemical
changes in nerves and damages the blood vessels that carry oxygen and
nutrients to the nerves.
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Symptoms
Symptoms of gastroparesis are
- Nausea
- Vomiting
- An early feeling of fullness when eating
- Weight loss
- Abdominal bloating
- Abdominal discomfort.
These symptoms may be mild or severe,
depending on the person.
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Complications of Gastroparesis
If food lingers too long in the stomach, it can
cause problems like bacterial overgrowth from the fermentation of food.
Also, the food can harden into solid masses called bezoars that may cause
nausea, vomiting, and obstruction in the stomach. Bezoars can be dangerous
if they block the passage of food into the small intestine.
Gastroparesis can make diabetes worse by adding to the difficulty of
controlling blood glucose. When food that has been delayed in the stomach
finally enters the small intestine and is absorbed, blood glucose levels
rise. Since gastroparesis makes stomach emptying unpredictable, a person's
blood glucose levels can be erratic and difficult to control.
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Major Causes of Gastroparesis
- Diabetes.
- Postviral syndromes.
- Anorexia nervosa.
- Surgery on the stomach or vagus nerve.
- Medications, particularly anticholinergics and narcotics (drugs that
slow contractions in the intestine).
- Gastroesophageal reflux disease (rarely).
- Smooth muscle disorders such as amyloidosis and scleroderma.
- Nervous system diseases, including abdominal migraine and
Parkinson's disease.
- Metabolic disorders, including hypothyroidism.
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Diagnosis
The diagnosis of gastroparesis is confirmed
through one or more of the following tests:
- Barium x-ray: After fasting for 12 hours, you will drink a
thick liquid called barium, which coats the inside of the stomach,
making it show up on the x-ray. Normally, the stomach will be empty of
all food after 12 hours of fasting. If the x-ray shows food in the
stomach, gastroparesis is likely. If the x-ray shows an empty stomach
but the doctor still suspects that you have delayed emptying, you may
need to repeat the test another day. On any one day, a person with
gastroparesis may digest a meal normally, giving a falsely normal test
result. If you have diabetes, your doctor may have special instructions
about fasting.
- Barium beefsteak meal: You will eat a meal that contains
barium, thus allowing the radiologist to watch your stomach as it
digests the meal. The amount of time it takes for the barium meal to be
digested and leave the stomach gives the doctor an idea of how well the
stomach is working. This test can help detect emptying problems that do
not show up on the liquid barium x-ray. In fact, people who have
diabetes-related gastroparesis often digest fluid normally, so the
barium beefsteak meal can be more useful.
- Radioisotope gastric-emptying scan: You will eat food that
contains a radioisotope, a slightly radioactive substance that will show
up on the scan. The dose of radiation from the radioisotope is small and
not dangerous. After eating, you will lie under a machine that detects
the radioisotope and shows an image of the food in the stomach and how
quickly it leaves the stomach. Gastroparesis is diagnosed if more than
half of the food remains in the stomach after 2 hours.
- Gastric manometry: This test measures electrical and muscular
activity in the stomach. The doctor passes a thin tube down the throat
into the stomach. The tube contains a wire that takes measurements of
the stomach's electrical and muscular activity as it digests liquids and
solid food. The measurements show how the stomach is working and whether
there is any delay in digestion.
- Blood tests: The doctor may also order laboratory tests to
check blood counts and to measure chemical and electrolyte levels.
To rule out causes of gastroparesis other than diabetes, the doctor may
do an upper endoscopy or an ultrasound.
- Upper endoscopy. After giving you a sedative, the doctor
passes a long, thin, tube called an endoscope through the mouth and
gently guides it down the esophagus into the stomach. Through the
endoscope, the doctor can look at the lining of the stomach to check for
any abnormalities.
- Ultrasound. To rule out gallbladder disease or pancreatitis
as a source of the problem, you may have an ultrasound test, which uses
harmless sound waves to outline and define the shape of the gallbladder
and pancreas.
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Treatment
The primary treatment goal for gastroparesis
related to diabetes is to regain control of blood glucose levels.
Treatments include insulin, oral medications, changes in what and when you
eat, and, in severe cases, feeding tubes and intravenous feeding.
It is important to note that in most cases treatment does not cure
gastroparesis--it is usually a chronic condition. Treatment helps you
manage the condition so that you can be as healthy and comfortable as
possible.
Insulin for blood glucose control in people with diabetes
If you have gastroparesis, your food is being absorbed more slowly and
at unpredictable times. To control blood glucose, you may need to
- Take insulin more often.
- Take your insulin after you eat instead of before.
- Check your blood glucose levels frequently after you eat,
administering insulin whenever necessary.
Some doctors recommend taking two injections of intermediate insulin
every day and as many injections of a fast-acting insulin as needed
according to blood glucose monitoring. The newest insulin, lispro insulin
(Humalog), is a quick-acting insulin that might be advantageous for people
with gastroparesis. It starts working within 5 to 15 minutes after
injection and peaks after 1 to 2 hours, lowering blood glucose levels
after a meal about twice as fast as the slower-acting regular insulin.
Your doctor will give you specific instructions based on your particular
needs.
Medication
Several drugs are used to treat gastroparesis. Your doctor may try
different drugs or combinations of drugs to find the most effective
treatment.
- Metoclopramide (Reglan). This drug stimulates stomach muscle
contractions to help empty food. It also helps reduce nausea and
vomiting. Metoclopramide is taken 20 to 30 minutes before meals and at
bedtime. Side effects of this drug are fatigue, sleepiness, and
sometimes depression, anxiety, and problems with physical movement.
- Erythromycin. This antibiotic also improves stomach emptying.
It works by increasing the contractions that move food through the
stomach. Side effects are nausea, vomiting, and abdominal cramps.
- Domperidone. The Food and Drug Administration is reviewing
domperidone, which has been used elsewhere in the world to treat
gastroparesis. It is a promotility agent like cisapride and
metoclopramide. Domperidone also helps with nausea.
- Other medications. Other medications may be used to treat
symptoms and problems related to gastroparesis. For example, an
antiemetic can help with nausea and vomiting. Antibiotics will clear up
a bacterial infection. If you have a bezoar, the doctor may use an
endoscope to inject medication that will dissolve it.
Meal and food changes
Changing your eating habits can help control gastroparesis. Your doctor
or dietitian will give you specific instructions, but you may be asked to
eat six small meals a day instead of three large ones. If less food enters
the stomach each time you eat, it may not become overly full. Or the
doctor or dietitian may suggest that you try several liquid meals a day
until your blood glucose levels are stable and the gastroparesis is
corrected. Liquid meals provide all the nutrients found in solid foods,
but can pass through the stomach more easily and quickly.
The doctor may also recommend that you avoid fatty and high-fiber
foods. Fat naturally slows digestion--a problem you do not need if you
have gastroparesis--and fiber is difficult to digest. Some high-fiber
foods like oranges and broccoli contain material that cannot be digested.
Avoid these foods because the indigestible part will remain in the stomach
too long and possibly form bezoars.
Feeding tube
If other approaches do not work, you may need surgery to insert a
feeding tube. The tube, called a jejunostomy tube, is inserted through the
skin on your abdomen into the small intestine. The feeding tube allows you
to put nutrients directly into the small intestine, bypassing the stomach
altogether. You will receive special liquid food to use with the tube. A
jejunostomy is particularly useful when gastroparesis prevents the
nutrients and medication necessary to regulate blood glucose levels from
reaching the bloodstream. By avoiding the source of the problem--the
stomach--and putting nutrients and medication directly into the small
intestine, you ensure that these products are digested and delivered to
your bloodstream quickly. A jejunostomy tube can be temporary and is used
only if necessary when gastroparesis is severe.
Parenteral nutrition
Parenteral nutrition refers to delivering nutrients directly into the
bloodstream, bypassing the digestive system. The doctor places a thin tube
called a catheter in a chest vein, leaving an opening to it outside the
skin. For feeding, you attach a bag containing liquid nutrients or
medication to the catheter. The fluid enters your bloodstream through the
vein. Your doctor will tell you what type of liquid nutrition to use.
This approach is an alternative to the jejunostomy tube and is usually
a temporary method to get you through a difficult spell of gastroparesis.
Parenteral nutrition is used only when gastroparesis is severe and is not
helped by other methods.
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Points to Remember
- Gastroparesis is a common complication of type 1 diabetes.
- Gastroparesis is the result of damage to the vagus nerve, which
controls the movement of food through the digestive system. Instead of
the food moving through the digestive tract normally, it is retained in
the stomach.
- The vagus nerve becomes damaged after years of poor blood glucose
control, resulting in gastroparesis. In turn, gastroparesis contributes
to poor blood glucose control.
- Symptoms of gastroparesis include early fullness, nausea, vomiting,
and weight loss.
- Gastroparesis is diagnosed through tests such as x-rays, manometry,
and scanning.
- Treatments include changes in when and what you eat, changes in
insulin type and timing of injections, oral medications, a jejunostomy,
or parenteral nutrition.
Keeping on Top of Your Condition
Keeping in tune with your disease or condition not only makes treatment less intimidating but also increases its chance of success, and has been shown to lower a patients risk of complications. As well, as an informed patient, you are better able to discuss your condition and treatment options with your physician.
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