Because the presence of feces in the intestinal cavity will seriously affect the diagnosis and treatment of colonoscopy, it is necessary to keep the intestinal cavity clean when accepting colonoscopy, so the previous intestinal preparation is very important, and the success or failure of colonoscopy diagnosis and treatment is closely related to the quality of intestinal preparation. Before accepting colonoscopy, doctors usually ask about the condition, have a physical examination, read the imaging materials that have been made, such as the X-rays of barium enema (if any), and then inform the patients of the purpose, significance and precautions of colonoscopy, sign the informed consent form, and finally arrange the date and place of diagnosis and treatment. Among the precautions, doctors will especially emphasize the importance of cleaning the intestines. In the preparation method before colonoscopy, we have gone through the exploration process of simple diet preparation, enema cleaning and oral laxatives. Simple diet preparation and enema cleaning often affect the observation and observation because of fecal residue, which has been rarely used at present. Oral laxatives have a good effect on clearing the intestines, but generally, diet should be adjusted before taking laxatives, that is, three days before the date of diagnosis and treatment is determined. The specific method is: eat a semi-liquid diet with little slag three days before diagnosis and treatment, and don't eat vegetables, fruits and dried fruits, especially foods with seeds or stones. Before 1 day, eat a low-fat, soft and liquid diet without residue, such as rice soup and lotus root starch, and do not drink milk. Breakfast should be fasted on the morning of diagnosis and treatment, and a small amount of liquid food can be eaten on the morning of diagnosis and treatment in the afternoon. The laxatives available are:

1. senna leaf: usage: 9g of water1000ml, 5 hours before operation. Advantages are low price, and disadvantages include mucosal irritation, abdominal pain, nausea and fatigue.

2. Mannitol: Usage: Take 250 ml of 20% mannitol orally 2 hours before diagnosis and treatment, and then quickly drink 500 ml of 5% sugar saline. Its advantages are no irritation to large intestine mucosa, less drinking water and easy acceptance by patients. The disadvantage is that it can decompose bacteria in the large intestine to produce combustible gases hydrogen and methane, which are easy to explode when exposed to heat such as electrocoagulation treatment.

3. magnesium sulfate: usage: take 50% magnesium sulfate 100 ml orally 4 hours before diagnosis and treatment, and then take 2000 ml of warm water orally within 1 hour. Advantages are low price, disadvantages include abdominal pain, vomiting, polydipsia, etc. In severe cases, the heart will slow down, blood pressure will drop, intestinal bleeding will be prohibited, and patients with severe cardiovascular diseases, respiratory diseases and severe renal insufficiency should use it with caution.

4. Electrolyte solution: Usage: Electrolyte powder (trade names are Shutaiqing, Fujingjing, He Shuang, etc.) is dissolved in water according to the instructions, and it is required to be drunk 5 hours before diagnosis and treatment, and generally 3,000 ml of solution should be drunk within 2 hours. Its advantages are no inflammatory reaction in intestinal mucosa, safety and difficulty in dehydration. The disadvantage is that there is a lot of drinking water, and some patients can't drink according to the amount, which leads to unsatisfactory intestinal cleaning.

In addition, you should pay attention to sleep and rest during preparation. If you have hypoglycemia symptoms such as dizziness, palpitation and cold sweat, you should drink sugar water or intravenous glucose.

Colonoscopy Union Hospital should be good.